ETH Price: $3,020.70 (-2.98%)
Gas: 8 Gwei

Contract

0x629C473e0E698FD101496E5fbDA4bcB58DA78dC4
 

Multichain Info

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Transaction Hash
Method
Block
From
To
Value
Nominate New Own...153892202022-08-22 8:24:29604 days ago1661156669IN
0x629C473e...58DA78dC4
0 ETH0.000457689.71582122
Twamm Swap153892192022-08-22 8:24:26604 days ago1661156666IN
0x629C473e...58DA78dC4
0 ETH0.005266210.73454431
0x60806040153869752022-08-21 23:45:17605 days ago1661125517IN
 Create: TWAMM_AMO
0 ETH0.0953184435

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Contract Source Code Verified (Exact Match)

Contract Name:
TWAMM_AMO

Compiler Version
v0.8.15+commit.e14f2714

Optimization Enabled:
Yes with 100000 runs

Other Settings:
default evmVersion, GNU GPLv2 license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2022-08-21
*/

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.0;

// Sources flattened with hardhat v2.10.1 https://hardhat.org

// File contracts/Frax/IFrax.sol


interface IFrax {
  function COLLATERAL_RATIO_PAUSER() external view returns (bytes32);
  function DEFAULT_ADMIN_ADDRESS() external view returns (address);
  function DEFAULT_ADMIN_ROLE() external view returns (bytes32);
  function addPool(address pool_address ) external;
  function allowance(address owner, address spender ) external view returns (uint256);
  function approve(address spender, uint256 amount ) external returns (bool);
  function balanceOf(address account ) external view returns (uint256);
  function burn(uint256 amount ) external;
  function burnFrom(address account, uint256 amount ) external;
  function collateral_ratio_paused() external view returns (bool);
  function controller_address() external view returns (address);
  function creator_address() external view returns (address);
  function decimals() external view returns (uint8);
  function decreaseAllowance(address spender, uint256 subtractedValue ) external returns (bool);
  function eth_usd_consumer_address() external view returns (address);
  function eth_usd_price() external view returns (uint256);
  function frax_eth_oracle_address() external view returns (address);
  function frax_info() external view returns (uint256, uint256, uint256, uint256, uint256, uint256, uint256, uint256);
  function frax_pools(address ) external view returns (bool);
  function frax_pools_array(uint256 ) external view returns (address);
  function frax_price() external view returns (uint256);
  function frax_step() external view returns (uint256);
  function fxs_address() external view returns (address);
  function fxs_eth_oracle_address() external view returns (address);
  function fxs_price() external view returns (uint256);
  function genesis_supply() external view returns (uint256);
  function getRoleAdmin(bytes32 role ) external view returns (bytes32);
  function getRoleMember(bytes32 role, uint256 index ) external view returns (address);
  function getRoleMemberCount(bytes32 role ) external view returns (uint256);
  function globalCollateralValue() external view returns (uint256);
  function global_collateral_ratio() external view returns (uint256);
  function grantRole(bytes32 role, address account ) external;
  function hasRole(bytes32 role, address account ) external view returns (bool);
  function increaseAllowance(address spender, uint256 addedValue ) external returns (bool);
  function last_call_time() external view returns (uint256);
  function minting_fee() external view returns (uint256);
  function name() external view returns (string memory);
  function owner_address() external view returns (address);
  function pool_burn_from(address b_address, uint256 b_amount ) external;
  function pool_mint(address m_address, uint256 m_amount ) external;
  function price_band() external view returns (uint256);
  function price_target() external view returns (uint256);
  function redemption_fee() external view returns (uint256);
  function refreshCollateralRatio() external;
  function refresh_cooldown() external view returns (uint256);
  function removePool(address pool_address ) external;
  function renounceRole(bytes32 role, address account ) external;
  function revokeRole(bytes32 role, address account ) external;
  function setController(address _controller_address ) external;
  function setETHUSDOracle(address _eth_usd_consumer_address ) external;
  function setFRAXEthOracle(address _frax_oracle_addr, address _weth_address ) external;
  function setFXSAddress(address _fxs_address ) external;
  function setFXSEthOracle(address _fxs_oracle_addr, address _weth_address ) external;
  function setFraxStep(uint256 _new_step ) external;
  function setMintingFee(uint256 min_fee ) external;
  function setOwner(address _owner_address ) external;
  function setPriceBand(uint256 _price_band ) external;
  function setPriceTarget(uint256 _new_price_target ) external;
  function setRedemptionFee(uint256 red_fee ) external;
  function setRefreshCooldown(uint256 _new_cooldown ) external;
  function setTimelock(address new_timelock ) external;
  function symbol() external view returns (string memory);
  function timelock_address() external view returns (address);
  function toggleCollateralRatio() external;
  function totalSupply() external view returns (uint256);
  function transfer(address recipient, uint256 amount ) external returns (bool);
  function transferFrom(address sender, address recipient, uint256 amount ) external returns (bool);
  function weth_address() external view returns (address);
}


// File contracts/FXS/IFxs.sol


interface IFxs {
  function DEFAULT_ADMIN_ROLE() external view returns(bytes32);
  function FRAXStablecoinAdd() external view returns(address);
  function FXS_DAO_min() external view returns(uint256);
  function allowance(address owner, address spender) external view returns(uint256);
  function approve(address spender, uint256 amount) external returns(bool);
  function balanceOf(address account) external view returns(uint256);
  function burn(uint256 amount) external;
  function burnFrom(address account, uint256 amount) external;
  function checkpoints(address, uint32) external view returns(uint32 fromBlock, uint96 votes);
  function decimals() external view returns(uint8);
  function decreaseAllowance(address spender, uint256 subtractedValue) external returns(bool);
  function genesis_supply() external view returns(uint256);
  function getCurrentVotes(address account) external view returns(uint96);
  function getPriorVotes(address account, uint256 blockNumber) external view returns(uint96);
  function getRoleAdmin(bytes32 role) external view returns(bytes32);
  function getRoleMember(bytes32 role, uint256 index) external view returns(address);
  function getRoleMemberCount(bytes32 role) external view returns(uint256);
  function grantRole(bytes32 role, address account) external;
  function hasRole(bytes32 role, address account) external view returns(bool);
  function increaseAllowance(address spender, uint256 addedValue) external returns(bool);
  function mint(address to, uint256 amount) external;
  function name() external view returns(string memory);
  function numCheckpoints(address) external view returns(uint32);
  function oracle_address() external view returns(address);
  function owner_address() external view returns(address);
  function pool_burn_from(address b_address, uint256 b_amount) external;
  function pool_mint(address m_address, uint256 m_amount) external;
  function renounceRole(bytes32 role, address account) external;
  function revokeRole(bytes32 role, address account) external;
  function setFRAXAddress(address frax_contract_address) external;
  function setFXSMinDAO(uint256 min_FXS) external;
  function setOracle(address new_oracle) external;
  function setOwner(address _owner_address) external;
  function setTimelock(address new_timelock) external;
  function symbol() external view returns(string memory);
  function timelock_address() external view returns(address);
  function toggleVotes() external;
  function totalSupply() external view returns(uint256);
  function trackingVotes() external view returns(bool);
  function transfer(address recipient, uint256 amount) external returns(bool);
  function transferFrom(address sender, address recipient, uint256 amount) external returns(bool);
}


// File contracts/Frax/IFraxAMOMinter.sol


// MAY need to be updated
interface IFraxAMOMinter {
  function FRAX() external view returns(address);
  function FXS() external view returns(address);
  function acceptOwnership() external;
  function addAMO(address amo_address, bool sync_too) external;
  function allAMOAddresses() external view returns(address[] memory);
  function allAMOsLength() external view returns(uint256);
  function amos(address) external view returns(bool);
  function amos_array(uint256) external view returns(address);
  function burnFraxFromAMO(uint256 frax_amount) external;
  function burnFxsFromAMO(uint256 fxs_amount) external;
  function col_idx() external view returns(uint256);
  function collatDollarBalance() external view returns(uint256);
  function collatDollarBalanceStored() external view returns(uint256);
  function collat_borrow_cap() external view returns(int256);
  function collat_borrowed_balances(address) external view returns(int256);
  function collat_borrowed_sum() external view returns(int256);
  function collateral_address() external view returns(address);
  function collateral_token() external view returns(address);
  function correction_offsets_amos(address, uint256) external view returns(int256);
  function custodian_address() external view returns(address);
  function dollarBalances() external view returns(uint256 frax_val_e18, uint256 collat_val_e18);
  // function execute(address _to, uint256 _value, bytes _data) external returns(bool, bytes);
  function fraxDollarBalanceStored() external view returns(uint256);
  function fraxTrackedAMO(address amo_address) external view returns(int256);
  function fraxTrackedGlobal() external view returns(int256);
  function frax_mint_balances(address) external view returns(int256);
  function frax_mint_cap() external view returns(int256);
  function frax_mint_sum() external view returns(int256);
  function fxs_mint_balances(address) external view returns(int256);
  function fxs_mint_cap() external view returns(int256);
  function fxs_mint_sum() external view returns(int256);
  function giveCollatToAMO(address destination_amo, uint256 collat_amount) external;
  function min_cr() external view returns(uint256);
  function mintFraxForAMO(address destination_amo, uint256 frax_amount) external;
  function mintFxsForAMO(address destination_amo, uint256 fxs_amount) external;
  function missing_decimals() external view returns(uint256);
  function nominateNewOwner(address _owner) external;
  function nominatedOwner() external view returns(address);
  function oldPoolCollectAndGive(address destination_amo) external;
  function oldPoolRedeem(uint256 frax_amount) external;
  function old_pool() external view returns(address);
  function owner() external view returns(address);
  function pool() external view returns(address);
  function receiveCollatFromAMO(uint256 usdc_amount) external;
  function recoverERC20(address tokenAddress, uint256 tokenAmount) external;
  function removeAMO(address amo_address, bool sync_too) external;
  function setAMOCorrectionOffsets(address amo_address, int256 frax_e18_correction, int256 collat_e18_correction) external;
  function setCollatBorrowCap(uint256 _collat_borrow_cap) external;
  function setCustodian(address _custodian_address) external;
  function setFraxMintCap(uint256 _frax_mint_cap) external;
  function setFraxPool(address _pool_address) external;
  function setFxsMintCap(uint256 _fxs_mint_cap) external;
  function setMinimumCollateralRatio(uint256 _min_cr) external;
  function setTimelock(address new_timelock) external;
  function syncDollarBalances() external;
  function timelock_address() external view returns(address);
}


// File contracts/Staking/Owned.sol


// https://docs.synthetix.io/contracts/Owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor (address _owner) public {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership");
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner {
        require(msg.sender == owner, "Only the contract owner may perform this action");
        _;
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}


// File contracts/Math/Math.sol


/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}


// File contracts/Math/SafeMath.sol


/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}


// File contracts/Curve/IveFXS.sol

pragma abicoder v2;

interface IveFXS {

    struct LockedBalance {
        int128 amount;
        uint256 end;
    }

    function commit_transfer_ownership(address addr) external;
    function apply_transfer_ownership() external;
    function commit_smart_wallet_checker(address addr) external;
    function apply_smart_wallet_checker() external;
    function toggleEmergencyUnlock() external;
    function recoverERC20(address token_addr, uint256 amount) external;
    function get_last_user_slope(address addr) external view returns (int128);
    function user_point_history__ts(address _addr, uint256 _idx) external view returns (uint256);
    function locked__end(address _addr) external view returns (uint256);
    function checkpoint() external;
    function deposit_for(address _addr, uint256 _value) external;
    function create_lock(uint256 _value, uint256 _unlock_time) external;
    function increase_amount(uint256 _value) external;
    function increase_unlock_time(uint256 _unlock_time) external;
    function withdraw() external;
    function balanceOf(address addr) external view returns (uint256);
    function balanceOf(address addr, uint256 _t) external view returns (uint256);
    function balanceOfAt(address addr, uint256 _block) external view returns (uint256);
    function totalSupply() external view returns (uint256);
    function totalSupply(uint256 t) external view returns (uint256);
    function totalSupplyAt(uint256 _block) external view returns (uint256);
    function totalFXSSupply() external view returns (uint256);
    function totalFXSSupplyAt(uint256 _block) external view returns (uint256);
    function changeController(address _newController) external;
    function token() external view returns (address);
    function supply() external view returns (uint256);
    function locked(address addr) external view returns (LockedBalance memory);
    function epoch() external view returns (uint256);
    function point_history(uint256 arg0) external view returns (int128 bias, int128 slope, uint256 ts, uint256 blk, uint256 fxs_amt);
    function user_point_history(address arg0, uint256 arg1) external view returns (int128 bias, int128 slope, uint256 ts, uint256 blk, uint256 fxs_amt);
    function user_point_epoch(address arg0) external view returns (uint256);
    function slope_changes(uint256 arg0) external view returns (int128);
    function controller() external view returns (address);
    function transfersEnabled() external view returns (bool);
    function emergencyUnlockActive() external view returns (bool);
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function version() external view returns (string memory);
    function decimals() external view returns (uint256);
    function future_smart_wallet_checker() external view returns (address);
    function smart_wallet_checker() external view returns (address);
    function admin() external view returns (address);
    function future_admin() external view returns (address);
}


// File contracts/Uniswap/TransferHelper.sol


// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
    }

    function safeTransfer(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
    }

    function safeTransferFrom(address token, address from, address to, uint value) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
    }

    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{value:value}(new bytes(0));
        require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
    }
}


// File contracts/Common/Context.sol


/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}


// File contracts/ERC20/IERC20.sol



/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}


// File contracts/Utils/Address.sol


/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


// File contracts/ERC20/ERC20.sol





/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20Mintable}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
 
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;
    
    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory __name, string memory __symbol) public {
        _name = __name;
        _symbol = __symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.approve(address spender, uint256 amount)
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for `accounts`'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");

        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }


    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal virtual {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of `from`'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of `from`'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:using-hooks.adoc[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}


// File contracts/ERC20/SafeERC20.sol




/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


// File contracts/Utils/ReentrancyGuard.sol


/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}


// File contracts/Staking/veFXSYieldDistributorV4.sol


// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ======================veFXSYieldDistributorV4=======================
// ====================================================================
// Distributes Frax protocol yield based on the claimer's veFXS balance
// V3: Yield will now not accrue for unlocked veFXS

// Frax Finance: https://github.com/FraxFinance

// Primary Author(s)
// Travis Moore: https://github.com/FortisFortuna

// Reviewer(s) / Contributor(s)
// Jason Huan: https://github.com/jasonhuan
// Sam Kazemian: https://github.com/samkazemian

// Originally inspired by Synthetix.io, but heavily modified by the Frax team (veFXS portion)
// https://github.com/Synthetixio/synthetix/blob/develop/contracts/StakingRewards.sol








contract veFXSYieldDistributorV4 is Owned, ReentrancyGuard {
    using SafeMath for uint256;
    using SafeERC20 for ERC20;

    /* ========== STATE VARIABLES ========== */

    // Instances
    IveFXS private veFXS;
    ERC20 public emittedToken;

    // Addresses
    address public emitted_token_address;

    // Admin addresses
    address public timelock_address;

    // Constant for price precision
    uint256 private constant PRICE_PRECISION = 1e6;

    // Yield and period related
    uint256 public periodFinish;
    uint256 public lastUpdateTime;
    uint256 public yieldRate;
    uint256 public yieldDuration = 604800; // 7 * 86400  (7 days)
    mapping(address => bool) public reward_notifiers;

    // Yield tracking
    uint256 public yieldPerVeFXSStored = 0;
    mapping(address => uint256) public userYieldPerTokenPaid;
    mapping(address => uint256) public yields;

    // veFXS tracking
    uint256 public totalVeFXSParticipating = 0;
    uint256 public totalVeFXSSupplyStored = 0;
    mapping(address => bool) public userIsInitialized;
    mapping(address => uint256) public userVeFXSCheckpointed;
    mapping(address => uint256) public userVeFXSEndpointCheckpointed;
    mapping(address => uint256) private lastRewardClaimTime; // staker addr -> timestamp

    // Greylists
    mapping(address => bool) public greylist;

    // Admin booleans for emergencies
    bool public yieldCollectionPaused = false; // For emergencies

    struct LockedBalance {
        int128 amount;
        uint256 end;
    }

    /* ========== MODIFIERS ========== */

    modifier onlyByOwnGov() {
        require( msg.sender == owner || msg.sender == timelock_address, "Not owner or timelock");
        _;
    }

    modifier notYieldCollectionPaused() {
        require(yieldCollectionPaused == false, "Yield collection is paused");
        _;
    }

    modifier checkpointUser(address account) {
        _checkpointUser(account);
        _;
    }

    /* ========== CONSTRUCTOR ========== */

    constructor (
        address _owner,
        address _emittedToken,
        address _timelock_address,
        address _veFXS_address
    ) Owned(_owner) {
        emitted_token_address = _emittedToken;
        emittedToken = ERC20(_emittedToken);

        veFXS = IveFXS(_veFXS_address);
        lastUpdateTime = block.timestamp;
        timelock_address = _timelock_address;

        reward_notifiers[_owner] = true;
    }

    /* ========== VIEWS ========== */

    function fractionParticipating() external view returns (uint256) {
        return totalVeFXSParticipating.mul(PRICE_PRECISION).div(totalVeFXSSupplyStored);
    }

    // Only positions with locked veFXS can accrue yield. Otherwise, expired-locked veFXS
    // is de-facto rewards for FXS.
    function eligibleCurrentVeFXS(address account) public view returns (uint256 eligible_vefxs_bal, uint256 stored_ending_timestamp) {
        uint256 curr_vefxs_bal = veFXS.balanceOf(account);
        
        // Stored is used to prevent abuse
        stored_ending_timestamp = userVeFXSEndpointCheckpointed[account];

        // Only unexpired veFXS should be eligible
        if (stored_ending_timestamp != 0 && (block.timestamp >= stored_ending_timestamp)){
            eligible_vefxs_bal = 0;
        }
        else if (block.timestamp >= stored_ending_timestamp){
            eligible_vefxs_bal = 0;
        }
        else {
            eligible_vefxs_bal = curr_vefxs_bal;
        }
    }

    function lastTimeYieldApplicable() public view returns (uint256) {
        return Math.min(block.timestamp, periodFinish);
    }

    function yieldPerVeFXS() public view returns (uint256) {
        if (totalVeFXSSupplyStored == 0) {
            return yieldPerVeFXSStored;
        } else {
            return (
                yieldPerVeFXSStored.add(
                    lastTimeYieldApplicable()
                        .sub(lastUpdateTime)
                        .mul(yieldRate)
                        .mul(1e18)
                        .div(totalVeFXSSupplyStored)
                )
            );
        }
    }

    function earned(address account) public view returns (uint256) {
        // Uninitialized users should not earn anything yet
        if (!userIsInitialized[account]) return 0;

        // Get eligible veFXS balances
        (uint256 eligible_current_vefxs, uint256 ending_timestamp) = eligibleCurrentVeFXS(account);

        // If your veFXS is unlocked
        uint256 eligible_time_fraction = PRICE_PRECISION;
        if (eligible_current_vefxs == 0){
            // And you already claimed after expiration
            if (lastRewardClaimTime[account] >= ending_timestamp) {
                // You get NOTHING. You LOSE. Good DAY ser!
                return 0;
            }
            // You haven't claimed yet
            else {
                uint256 eligible_time = (ending_timestamp).sub(lastRewardClaimTime[account]);
                uint256 total_time = (block.timestamp).sub(lastRewardClaimTime[account]);
                eligible_time_fraction = PRICE_PRECISION.mul(eligible_time).div(total_time);
            }
        }

        // If the amount of veFXS increased, only pay off based on the old balance
        // Otherwise, take the midpoint
        uint256 vefxs_balance_to_use;
        {
            uint256 old_vefxs_balance = userVeFXSCheckpointed[account];
            if (eligible_current_vefxs > old_vefxs_balance){
                vefxs_balance_to_use = old_vefxs_balance;
            }
            else {
                vefxs_balance_to_use = ((eligible_current_vefxs).add(old_vefxs_balance)).div(2); 
            }
        }

        return (
            vefxs_balance_to_use
                .mul(yieldPerVeFXS().sub(userYieldPerTokenPaid[account]))
                .mul(eligible_time_fraction)
                .div(1e18 * PRICE_PRECISION)
                .add(yields[account])
        );
    }

    function getYieldForDuration() external view returns (uint256) {
        return (yieldRate.mul(yieldDuration));
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    function _checkpointUser(address account) internal {
        // Need to retro-adjust some things if the period hasn't been renewed, then start a new one
        sync();

        // Calculate the earnings first
        _syncEarned(account);

        // Get the old and the new veFXS balances
        uint256 old_vefxs_balance = userVeFXSCheckpointed[account];
        uint256 new_vefxs_balance = veFXS.balanceOf(account);

        // Update the user's stored veFXS balance
        userVeFXSCheckpointed[account] = new_vefxs_balance;

        // Update the user's stored ending timestamp
        IveFXS.LockedBalance memory curr_locked_bal_pack = veFXS.locked(account);
        userVeFXSEndpointCheckpointed[account] = curr_locked_bal_pack.end;

        // Update the total amount participating
        if (new_vefxs_balance >= old_vefxs_balance) {
            uint256 weight_diff = new_vefxs_balance.sub(old_vefxs_balance);
            totalVeFXSParticipating = totalVeFXSParticipating.add(weight_diff);
        } else {
            uint256 weight_diff = old_vefxs_balance.sub(new_vefxs_balance);
            totalVeFXSParticipating = totalVeFXSParticipating.sub(weight_diff);
        }

        // Mark the user as initialized
        if (!userIsInitialized[account]) {
            userIsInitialized[account] = true;
            lastRewardClaimTime[account] = block.timestamp;
        }
    }

    function _syncEarned(address account) internal {
        if (account != address(0)) {
            uint256 earned0 = earned(account);
            yields[account] = earned0;
            userYieldPerTokenPaid[account] = yieldPerVeFXSStored;
        }
    }

    // Anyone can checkpoint another user
    function checkpointOtherUser(address user_addr) external {
        _checkpointUser(user_addr);
    }

    // Checkpoints the user
    function checkpoint() external {
        _checkpointUser(msg.sender);
    }

    function getYield() external nonReentrant notYieldCollectionPaused checkpointUser(msg.sender) returns (uint256 yield0) {
        require(greylist[msg.sender] == false, "Address has been greylisted");

        yield0 = yields[msg.sender];
        if (yield0 > 0) {
            yields[msg.sender] = 0;
            TransferHelper.safeTransfer(
                emitted_token_address,
                msg.sender,
                yield0
            );
            emit YieldCollected(msg.sender, yield0, emitted_token_address);
        }

        lastRewardClaimTime[msg.sender] = block.timestamp;
    }


    function sync() public {
        // Update the total veFXS supply
        yieldPerVeFXSStored = yieldPerVeFXS();
        totalVeFXSSupplyStored = veFXS.totalSupply();
        lastUpdateTime = lastTimeYieldApplicable();
    }

    function notifyRewardAmount(uint256 amount) external {
        // Only whitelisted addresses can notify rewards
        require(reward_notifiers[msg.sender], "Sender not whitelisted");

        // Handle the transfer of emission tokens via `transferFrom` to reduce the number
        // of transactions required and ensure correctness of the smission amount
        emittedToken.safeTransferFrom(msg.sender, address(this), amount);

        // Update some values beforehand
        sync();

        // Update the new yieldRate
        if (block.timestamp >= periodFinish) {
            yieldRate = amount.div(yieldDuration);
        } else {
            uint256 remaining = periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(yieldRate);
            yieldRate = amount.add(leftover).div(yieldDuration);
        }
        
        // Update duration-related info
        lastUpdateTime = block.timestamp;
        periodFinish = block.timestamp.add(yieldDuration);

        emit RewardAdded(amount, yieldRate);
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    // Added to support recovering LP Yield and other mistaken tokens from other systems to be distributed to holders
    function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyByOwnGov {
        // Only the owner address can ever receive the recovery withdrawal
        TransferHelper.safeTransfer(tokenAddress, owner, tokenAmount);
        emit RecoveredERC20(tokenAddress, tokenAmount);
    }

    function setYieldDuration(uint256 _yieldDuration) external onlyByOwnGov {
        require( periodFinish == 0 || block.timestamp > periodFinish, "Previous yield period must be complete before changing the duration for the new period");
        yieldDuration = _yieldDuration;
        emit YieldDurationUpdated(yieldDuration);
    }

    function greylistAddress(address _address) external onlyByOwnGov {
        greylist[_address] = !(greylist[_address]);
    }

    function toggleRewardNotifier(address notifier_addr) external onlyByOwnGov {
        reward_notifiers[notifier_addr] = !reward_notifiers[notifier_addr];
    }

    function setPauses(bool _yieldCollectionPaused) external onlyByOwnGov {
        yieldCollectionPaused = _yieldCollectionPaused;
    }

    function setYieldRate(uint256 _new_rate0, bool sync_too) external onlyByOwnGov {
        yieldRate = _new_rate0;

        if (sync_too) {
            sync();
        }
    }

    function setTimelock(address _new_timelock) external onlyByOwnGov {
        timelock_address = _new_timelock;
    }

    /* ========== EVENTS ========== */

    event RewardAdded(uint256 reward, uint256 yieldRate);
    event OldYieldCollected(address indexed user, uint256 yield, address token_address);
    event YieldCollected(address indexed user, uint256 yield, address token_address);
    event YieldDurationUpdated(uint256 newDuration);
    event RecoveredERC20(address token, uint256 amount);
    event YieldPeriodRenewed(address token, uint256 yieldRate);
    event DefaultInitialization();

    /* ========== A CHICKEN ========== */
    //
    //         ,~.
    //      ,-'__ `-,
    //     {,-'  `. }              ,')
    //    ,( a )   `-.__         ,',')~,
    //   <=.) (         `-.__,==' ' ' '}
    //     (   )                      /)
    //      `-'\   ,                    )
    //          |  \        `~.        /
    //          \   `._        \      /
    //           \     `._____,'    ,'
    //            `-.             ,'
    //               `-._     _,-'
    //                   77jj'
    //                  //_||
    //               __//--'/`
    //             ,--'/`  '
    //
    // [hjw] https://textart.io/art/vw6Sa3iwqIRGkZsN1BC2vweF/chicken
}


// File contracts/Oracle/AggregatorV3Interface.sol


interface AggregatorV3Interface {

  function decimals() external view returns (uint8);
  function description() external view returns (string memory);
  function version() external view returns (uint256);

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

}


// File contracts/Fraxswap/core/interfaces/IUniswapV2PairV5.sol


interface IUniswapV2PairV5 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;
    function initialize(address, address) external;
}


// File contracts/Fraxswap/core/interfaces/IFraxswapPair.sol


// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ========================= IFraxswapPair ==========================
// ====================================================================
// Fraxswap LP Pair Interface
// Inspired by https://www.paradigm.xyz/2021/07/twamm
// https://github.com/para-dave/twamm

// Frax Finance: https://github.com/FraxFinance

// Primary Author(s)
// Rich Gee: https://github.com/zer0blockchain
// Dennis: https://github.com/denett

// Reviewer(s) / Contributor(s)
// Travis Moore: https://github.com/FortisFortuna
// Sam Kazemian: https://github.com/samkazemian

interface IFraxswapPair is IUniswapV2PairV5 {
    // TWAMM

    event LongTermSwap0To1(address indexed addr, uint256 orderId, uint256 amount0In, uint256 numberOfTimeIntervals);
    event LongTermSwap1To0(address indexed addr, uint256 orderId, uint256 amount1In, uint256 numberOfTimeIntervals);
    event CancelLongTermOrder(address indexed addr, uint256 orderId, address sellToken, uint256 unsoldAmount, address buyToken, uint256 purchasedAmount);
    event WithdrawProceedsFromLongTermOrder(address indexed addr, uint256 orderId, address indexed proceedToken, uint256 proceeds, bool orderExpired);
    
    function fee() external view returns (uint);

    function longTermSwapFrom0To1(uint256 amount0In, uint256 numberOfTimeIntervals) external returns (uint256 orderId);
    function longTermSwapFrom1To0(uint256 amount1In, uint256 numberOfTimeIntervals) external returns (uint256 orderId);
    function cancelLongTermSwap(uint256 orderId) external;
    function withdrawProceedsFromLongTermSwap(uint256 orderId) external returns (bool is_expired, address rewardTkn, uint256 totalReward);
    function executeVirtualOrders(uint256 blockTimestamp) external;

    function getAmountOut(uint amountIn, address tokenIn) external view returns (uint);
    function getAmountIn(uint amountOut, address tokenOut) external view returns (uint);

    function orderTimeInterval() external returns (uint256);
    function getTWAPHistoryLength() external view returns (uint);
    function getTwammReserves() external view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast, uint112 _twammReserve0, uint112 _twammReserve1, uint256 _fee);
    function getReserveAfterTwamm(uint256 blockTimestamp) external view returns (uint112 _reserve0, uint112 _reserve1, uint256 lastVirtualOrderTimestamp, uint112 _twammReserve0, uint112 _twammReserve1);
    function getNextOrderID() external view returns (uint256);
    function getOrderIDsForUser(address user) external view returns (uint256[] memory);
    function getOrderIDsForUserLength(address user) external view returns (uint256);
//    function getDetailedOrdersForUser(address user, uint256 offset, uint256 limit) external view returns (LongTermOrdersLib.Order[] memory detailed_orders);
    function twammUpToDate() external view returns (bool);
    function getTwammState() external view returns (uint256 token0Rate, uint256 token1Rate, uint256 lastVirtualOrderTimestamp, uint256 orderTimeInterval_rtn, uint256 rewardFactorPool0, uint256 rewardFactorPool1);
    function getTwammSalesRateEnding(uint256 _blockTimestamp) external view returns (uint256 orderPool0SalesRateEnding, uint256 orderPool1SalesRateEnding);
    function getTwammRewardFactor(uint256 _blockTimestamp) external view returns (uint256 rewardFactorPool0AtTimestamp, uint256 rewardFactorPool1AtTimestamp);
    function getTwammOrder(uint256 orderId) external view returns (uint256 id, uint256 creationTimestamp, uint256 expirationTimestamp, uint256 saleRate, address owner, address sellTokenAddr, address buyTokenAddr);
    function getTwammOrderProceedsView(uint256 orderId, uint256 blockTimestamp) external view returns (bool orderExpired, uint256 totalReward);
    function getTwammOrderProceeds(uint256 orderId) external returns (bool orderExpired, uint256 totalReward);


    function togglePauseNewSwaps() external;
}


// File contracts/Misc_AMOs/TWAMM_AMO.sol


// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ============================ TWAMM_AMO =============================
// ====================================================================
// Interacts with Fraxswap to buy and sell FRAX and FXS
// Also can burn them or in the case of FXS, give to veFXS yield
// Frax Finance: https://github.com/FraxFinance

// Primary Author(s)
// Travis Moore: https://github.com/FortisFortuna

// Reviewer(s) / Contributor(s)
// Sam Kazemian: https://github.com/samkazemian
// Rich Gee: https://github.com/zer0blockchain
// Dennis: https://github.com/denett
// Jack Corddry: https://github.com/corddry






// import "../Fraxswap/periphery/libraries/UniswapV2LiquidityMathLibraryMini.sol";

contract TWAMM_AMO is Owned {

    // Core
    IFrax public FRAX;
    IFxs public FXS;
    IFraxswapPair public fraxswap_pair;
    IFraxAMOMinter public amo_minter;
    veFXSYieldDistributorV4 public yield_distributor;
    address public timelock_address;
    address public msig_address;

    // Oracles
    AggregatorV3Interface public priceFeedFRAXUSD;
    AggregatorV3Interface public priceFeedFXSUSD;
    uint256 public chainlink_frax_usd_decimals;
    uint256 public chainlink_fxs_usd_decimals;

    // Safety
    uint256 public max_swap_frax_amt_in = 10000000e18; // 10M, mainly fat-finger precautions
    uint256 public max_swap_fxs_amt_in = 10000000e18; // 10M, mainly fat-finger precautions

    // Constants for various precisions
    uint256 public constant PRICE_PRECISION = 1e18;

    // Misc
    bool public frax_is_token0;
    uint256 public num_twamm_intervals = 168; // Each interval is default 3600 sec (1 hr)
    uint256 public swap_period = 7 * 86400; // 7 days

    /* ========== MODIFIERS ========== */

    modifier onlyByOwnGov() {
        require(msg.sender == owner || msg.sender == timelock_address, "Not owner or timelock");
        _;
    }

    /* ========== CONSTRUCTOR ========== */

    constructor (
        address _creator_address,
        address _timelock_address,
        address[8] memory _address_pack
    ) Owned(_creator_address) {
        // Set timelock
        timelock_address = _timelock_address;

        // Set instances
        FRAX = IFrax(_address_pack[0]);
        FXS = IFxs(_address_pack[1]);
        fraxswap_pair = IFraxswapPair(_address_pack[2]);
        priceFeedFRAXUSD = AggregatorV3Interface(_address_pack[3]);
        priceFeedFXSUSD = AggregatorV3Interface(_address_pack[4]);
        msig_address = _address_pack[5];
        amo_minter = IFraxAMOMinter(_address_pack[6]);
        yield_distributor = veFXSYieldDistributorV4(_address_pack[7]);

        // Set the oracle decimals
        chainlink_frax_usd_decimals = priceFeedFRAXUSD.decimals();
        chainlink_fxs_usd_decimals = priceFeedFXSUSD.decimals();

        // Need to know which token FRAX is (0 or 1)
        address token0 = fraxswap_pair.token0();
        if (token0 == address(FRAX)) frax_is_token0 = true;
        else frax_is_token0 = false;

        // Get the number of TWAMM intervals. Truncation desired
        num_twamm_intervals = swap_period / fraxswap_pair.orderTimeInterval();
    }


    /* ========== VIEWS ========== */

    // Needed as a FRAX AMO
    function dollarBalances() public view returns (uint256 frax_val_e18, uint256 collat_val_e18) {
        frax_val_e18 = FRAX.balanceOf(address(this)); // Unallocated FRAX
        collat_val_e18 = (frax_val_e18 * FRAX.global_collateral_ratio()) / 1e6;
    }

    // In Chainlink decimals
    function getFRAXPriceE18() public view returns (uint256) {
        (uint80 roundID, int price, , uint256 updatedAt, uint80 answeredInRound) = priceFeedFRAXUSD.latestRoundData();
        require(price >= 0 && updatedAt!= 0 && answeredInRound >= roundID, "Invalid chainlink price");

        return ((uint256(price) * 1e18) / (10 ** chainlink_frax_usd_decimals));
    }

    // In Chainlink decimals    
    function getFXSPriceE18() public view returns (uint256) {
        (uint80 roundID, int price, , uint256 updatedAt, uint80 answeredInRound) = priceFeedFXSUSD.latestRoundData();
        require(price >= 0 && updatedAt!= 0 && answeredInRound >= roundID, "Invalid chainlink price");

        return ((uint256(price) * 1e18) / (10 ** chainlink_fxs_usd_decimals));
    }

    /* ========== MUTATIVE ========== */

    // Use the TWAMM
    function twammSwap(uint256 frax_sell_amt, uint256 fxs_sell_amount, uint256 override_intervals) external onlyByOwnGov returns (uint256 frax_to_use, uint256 fxs_to_use, uint256 new_order_id) {
        // Make sure only one direction occurs
        require(!((frax_sell_amt > 0) && (fxs_sell_amount > 0)), "Can only sell in one direction");

        {
            if (fxs_sell_amount > 0) {
                // Sell FXS for FRAX
                // --------------------------------
                fxs_to_use = fxs_sell_amount;
    
                // Make sure nonzero
                require(fxs_to_use > 0, "FXS sold must be nonzero");

                // Safety check
                require(fxs_to_use <= max_swap_fxs_amt_in, "Too much FXS sold");

                // Approve FXS first
                FXS.approve(address(fraxswap_pair), fxs_to_use);

                // Swap
                if (frax_is_token0) {
                    new_order_id = fraxswap_pair.longTermSwapFrom1To0(fxs_to_use, override_intervals > 0 ? override_intervals : num_twamm_intervals);
                }
                else {
                    new_order_id = fraxswap_pair.longTermSwapFrom0To1(fxs_to_use, override_intervals > 0 ? override_intervals : num_twamm_intervals);
                }
            }
            else {
                // Use FRAX to buy FXS
                // --------------------------------
                frax_to_use = frax_sell_amt;

                // Make sure nonzero
                require(frax_to_use > 0, "FRAX sold must be nonzero");

                // Safety check
                require(frax_to_use <= max_swap_frax_amt_in, "Too much FRAX sold");

                // Approve FRAX first
                FRAX.approve(address(fraxswap_pair), frax_to_use);

                // Swap
                if (frax_is_token0) {
                    new_order_id = fraxswap_pair.longTermSwapFrom0To1(frax_to_use, override_intervals > 0 ? override_intervals : num_twamm_intervals);
                }
                else {
                    new_order_id = fraxswap_pair.longTermSwapFrom1To0(frax_to_use, override_intervals > 0 ? override_intervals : num_twamm_intervals);
                }
            }
        }

        emit SwapInitiated(new_order_id, frax_to_use, fxs_to_use, block.timestamp);
    }

    function cancelTWAMMOrder(uint256 order_id) external onlyByOwnGov {
        // Cancel the order
        fraxswap_pair.cancelLongTermSwap(order_id);

        emit SwapCancelled(order_id);
    }

    function collectCurrTWAMMProceeds(uint256 order_id) external onlyByOwnGov {
        // Withdraw current proceeds
        (, address rewardTkn, uint256 totalReward) = fraxswap_pair.withdrawProceedsFromLongTermSwap(order_id);

        emit SwapProceedsCollected(order_id, rewardTkn, totalReward);
    }

    // token_choice 0 = FRAX; 1 = FXS
    function burnAndOrGive(
        uint8 token_choice, 
        uint256 burn_amount, 
        uint256 give_amount_yield_dist,
        uint256 give_amount_msig
    ) external onlyByOwnGov {
        if (token_choice == 0) {
            // Burn some of the FRAX
            if (burn_amount > 0) burnFRAX(burn_amount);

            // Give the rest to the yield distributor
            // NOT APPLICABLE FOR FRAX

            // Give some to the msig
            if (give_amount_msig > 0) TransferHelper.safeTransfer(address(FRAX), msig_address, give_amount_msig);
        }
        else {
            // Burn some of the FXS
            if (burn_amount > 0) burnFXS(burn_amount);

            // Give some to the yield distributor
            if (give_amount_yield_dist > 0) {
                FXS.approve(address(yield_distributor), give_amount_yield_dist);
                yield_distributor.notifyRewardAmount(give_amount_yield_dist);
            }

            // Give some to the msig
            if (give_amount_msig > 0) TransferHelper.safeTransfer(address(FXS), msig_address, give_amount_msig);
        }

        emit burnAndOrGiven(token_choice, burn_amount, give_amount_yield_dist, give_amount_msig);
    }

    /* ========== Burns and givebacks ========== */
   
    // Burn unneeded or excess FRAX. Goes through the minter
    function burnFRAX(uint256 frax_amount) public onlyByOwnGov {
        FRAX.approve(address(amo_minter), frax_amount);
        amo_minter.burnFraxFromAMO(frax_amount);

        emit FRAXBurned(frax_amount);
    }

    // Burn unneeded FXS. Goes through the minter
    function burnFXS(uint256 fxs_amount) public onlyByOwnGov {
        FXS.approve(address(amo_minter), fxs_amount);
        amo_minter.burnFxsFromAMO(fxs_amount);

        emit FXSBurned(fxs_amount);
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    function setOracles(address _frax_oracle, address _fxs_oracle) external onlyByOwnGov {
        priceFeedFRAXUSD = AggregatorV3Interface(_frax_oracle);
        priceFeedFXSUSD = AggregatorV3Interface(_fxs_oracle);

        // Set the Chainlink oracle decimals
        chainlink_frax_usd_decimals = priceFeedFRAXUSD.decimals();
        chainlink_fxs_usd_decimals = priceFeedFXSUSD.decimals();
    }

    function setTWAMMAndSwapPeriod(address _twamm_addr, uint256 _swap_period) external onlyByOwnGov {
        // Change the TWAMM parameters
        fraxswap_pair = IFraxswapPair(_twamm_addr);
        swap_period = _swap_period;
        num_twamm_intervals = _swap_period / fraxswap_pair.orderTimeInterval();
    }

    function setTWAMMMaxSwapIn(uint256 _max_swap_frax_amt_in, uint256 _max_swap_fxs_amt_in) external onlyByOwnGov {
        max_swap_frax_amt_in = _max_swap_frax_amt_in;
        max_swap_fxs_amt_in = _max_swap_fxs_amt_in;
    }

    function setMiscAddresses(address _new_msig_address, address _new_yield_distributor_address) external onlyByOwnGov {
        msig_address = _new_msig_address;
        yield_distributor = veFXSYieldDistributorV4(_new_yield_distributor_address);
    }

    function setTimelock(address _new_timelock_address) external onlyByOwnGov {
        timelock_address = _new_timelock_address;
    }

    // Added to support recovering LP Rewards and other mistaken tokens from other systems to be distributed to holders
    function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyByOwnGov {
        // Only the owner address can ever receive the recovery withdrawal
        TransferHelper.safeTransfer(tokenAddress, owner, tokenAmount);
        emit RecoveredERC20(tokenAddress, tokenAmount);
    }

    /* ========== EVENTS ========== */
    event SwapInitiated(uint256 order_id, uint256 frax_amt, uint256 fxs_amt, uint256 timestamp);
    event SwapCancelled(uint256 order_id);
    event SwapProceedsCollected(uint256 order_id, address reward_tkn, uint256 ttl_reward);
    event burnAndOrGiven(uint8 token_choice, uint256 burn_amount, uint256 give_amount_yield_dist, uint256 give_amount_msig);
    event FRAXBurned(uint256 frax_amount);
    event FXSBurned(uint256 fxs_amount);
    event RecoveredERC20(address token, uint256 amount);
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_creator_address","type":"address"},{"internalType":"address","name":"_timelock_address","type":"address"},{"internalType":"address[8]","name":"_address_pack","type":"address[8]"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"frax_amount","type":"uint256"}],"name":"FRAXBurned","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"fxs_amount","type":"uint256"}],"name":"FXSBurned","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerNominated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"RecoveredERC20","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"order_id","type":"uint256"}],"name":"SwapCancelled","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"order_id","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"frax_amt","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"fxs_amt","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"SwapInitiated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"order_id","type":"uint256"},{"indexed":false,"internalType":"address","name":"reward_tkn","type":"address"},{"indexed":false,"internalType":"uint256","name":"ttl_reward","type":"uint256"}],"name":"SwapProceedsCollected","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"token_choice","type":"uint8"},{"indexed":false,"internalType":"uint256","name":"burn_amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"give_amount_yield_dist","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"give_amount_msig","type":"uint256"}],"name":"burnAndOrGiven","type":"event"},{"inputs":[],"name":"FRAX","outputs":[{"internalType":"contract IFrax","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"FXS","outputs":[{"internalType":"contract IFxs","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PRICE_PRECISION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"amo_minter","outputs":[{"internalType":"contract IFraxAMOMinter","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint8","name":"token_choice","type":"uint8"},{"internalType":"uint256","name":"burn_amount","type":"uint256"},{"internalType":"uint256","name":"give_amount_yield_dist","type":"uint256"},{"internalType":"uint256","name":"give_amount_msig","type":"uint256"}],"name":"burnAndOrGive","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"frax_amount","type":"uint256"}],"name":"burnFRAX","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"fxs_amount","type":"uint256"}],"name":"burnFXS","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"order_id","type":"uint256"}],"name":"cancelTWAMMOrder","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"chainlink_frax_usd_decimals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"chainlink_fxs_usd_decimals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"order_id","type":"uint256"}],"name":"collectCurrTWAMMProceeds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"dollarBalances","outputs":[{"internalType":"uint256","name":"frax_val_e18","type":"uint256"},{"internalType":"uint256","name":"collat_val_e18","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"frax_is_token0","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fraxswap_pair","outputs":[{"internalType":"contract IFraxswapPair","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getFRAXPriceE18","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getFXSPriceE18","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"max_swap_frax_amt_in","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"max_swap_fxs_amt_in","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"msig_address","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"nominateNewOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"nominatedOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"num_twamm_intervals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"priceFeedFRAXUSD","outputs":[{"internalType":"contract AggregatorV3Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"priceFeedFXSUSD","outputs":[{"internalType":"contract AggregatorV3Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"tokenAmount","type":"uint256"}],"name":"recoverERC20","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_new_msig_address","type":"address"},{"internalType":"address","name":"_new_yield_distributor_address","type":"address"}],"name":"setMiscAddresses","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_frax_oracle","type":"address"},{"internalType":"address","name":"_fxs_oracle","type":"address"}],"name":"setOracles","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_twamm_addr","type":"address"},{"internalType":"uint256","name":"_swap_period","type":"uint256"}],"name":"setTWAMMAndSwapPeriod","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_max_swap_frax_amt_in","type":"uint256"},{"internalType":"uint256","name":"_max_swap_fxs_amt_in","type":"uint256"}],"name":"setTWAMMMaxSwapIn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_new_timelock_address","type":"address"}],"name":"setTimelock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"swap_period","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"timelock_address","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"frax_sell_amt","type":"uint256"},{"internalType":"uint256","name":"fxs_sell_amount","type":"uint256"},{"internalType":"uint256","name":"override_intervals","type":"uint256"}],"name":"twammSwap","outputs":[{"internalType":"uint256","name":"frax_to_use","type":"uint256"},{"internalType":"uint256","name":"fxs_to_use","type":"uint256"},{"internalType":"uint256","name":"new_order_id","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"yield_distributor","outputs":[{"internalType":"contract veFXSYieldDistributorV4","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : _creator_address (address): 0x234D953a9404Bf9DbC3b526271d440cD2870bCd2
Arg [1] : _timelock_address (address): 0x8412ebf45bAC1B340BbE8F318b928C466c4E39CA
Arg [2] : _address_pack (address[8]): 0x853d955aCEf822Db058eb8505911ED77F175b99e,0x3432B6A60D23Ca0dFCa7761B7ab56459D9C964D0,0x03B59Bd1c8B9F6C265bA0c3421923B93f15036Fa,0xB9E1E3A9feFf48998E45Fa90847ed4D467E8BcfD,0x6Ebc52C8C1089be9eB3945C4350B68B8E4C2233f,0xB1748C79709f4Ba2Dd82834B8c82D4a505003f27,0xcf37B62109b537fa0Cb9A90Af4CA72f6fb85E241,0xc6764e58b36e26b08Fd1d2AeD4538c02171fA872

-----Encoded View---------------
10 Constructor Arguments found :
Arg [0] : 000000000000000000000000234d953a9404bf9dbc3b526271d440cd2870bcd2
Arg [1] : 0000000000000000000000008412ebf45bac1b340bbe8f318b928c466c4e39ca
Arg [2] : 000000000000000000000000853d955acef822db058eb8505911ed77f175b99e
Arg [3] : 0000000000000000000000003432b6a60d23ca0dfca7761b7ab56459d9c964d0
Arg [4] : 00000000000000000000000003b59bd1c8b9f6c265ba0c3421923b93f15036fa
Arg [5] : 000000000000000000000000b9e1e3a9feff48998e45fa90847ed4d467e8bcfd
Arg [6] : 0000000000000000000000006ebc52c8c1089be9eb3945c4350b68b8e4c2233f
Arg [7] : 000000000000000000000000b1748c79709f4ba2dd82834b8c82d4a505003f27
Arg [8] : 000000000000000000000000cf37b62109b537fa0cb9a90af4ca72f6fb85e241
Arg [9] : 000000000000000000000000c6764e58b36e26b08fd1d2aed4538c02171fa872


Deployed Bytecode Sourcemap

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Swarm Source

ipfs://f314d67574f5d9c9dd852e40efec4a5f2a4f852ee1354dfb6d2aa7d22d3c68ca

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.