Contract 0xa256d4bCDDC26376cFba0Fe0476098aAbD6EB7e4

 
Txn Hash
Method
Block
From
To
Value
0x7d38c37b25e153f550e9adfcb463f4e1316938fc3415eef0bb62e781c00a7618Withdraw152023942022-07-24 1:22:3424 days 5 hrs ago0xacace7c61f7ff43a8c05f188eb7246971456c9c7 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00039968 4.‍64380328
0xeded12235aa5da04b25fad2a8865e2fb4f11214de784e491931b2f6e3a14b888Stake152023602022-07-24 1:15:3824 days 6 hrs ago0xacace7c61f7ff43a8c05f188eb7246971456c9c7 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00056445 5.‍09366616
0x77d480d2f7ecad0068383efac72a3244f3e09e6dac5de1da7b28e326cfb3d21eWithdraw149662952022-06-15 7:23:5562 days 23 hrs ago0x9b3f49a186670194f625199b822fcbdfd3feacf7 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00220428 25.‍61100665
0x1254595833de5c6909c26aaf90ed98416b4d8088064a4dc9b69722e9d85ee230Get Reward149368002022-06-10 5:47:5768 days 1 hr ago0x9b3f49a186670194f625199b822fcbdfd3feacf7 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00341688 44.‍61672129
0x7d54b6610e612c3b42b045147e11362ec76d4d6595494404c1dd413097bd905dWithdraw149029432022-06-04 11:14:1373 days 20 hrs ago0x8a6ad6dd70acba5f90acbfd094ea930099b48071 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00291242 33.‍83860828
0x14ec2ea093151d90112693dd21896e5745034e731399106fbdd6cb74783bd024Get Reward148256702022-05-22 21:17:4486 days 10 hrs ago0x8a6ad6dd70acba5f90acbfd094ea930099b48071 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00154936 16.‍67277003
0x09f29054ef5a3617898e74e97a228844517e27d560f009c578b33c2b6bc0793fGet Reward147841712022-05-16 4:26:1993 days 2 hrs ago0xcd75c47b2ec49e92cc673269b53d1a75d023dfc9 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍0011069 14.‍45362412
0x502bad93395916cb7f57ce9918f718005dc83775758839dce3fcfc7eae79bfeaGet Reward147802422022-05-15 13:35:1993 days 17 hrs ago0x94a14774ffa8ac3122d2a57c2cc5886dd6288923 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00178952 21.‍95255012
0xc1a856b38dd7696d80298eee0986b1e5a1b54e9f5cd4829e32204bbe13b5fd24Get Reward147404062022-05-09 4:48:03100 days 2 hrs ago0x9b3f49a186670194f625199b822fcbdfd3feacf7 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00143093 17.‍5620318
0x80996b51d643df22f0218ecdadab641494c7fada100e266a67216e4586dcf622Get Reward147221212022-05-06 7:05:04103 days 17 mins ago0x8a6ad6dd70acba5f90acbfd094ea930099b48071 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍003258 39.‍98583745
0xf2998b7c8c86b446e4f8b66aa597b02f2cca35d378e30747f3765c0002752682Get Reward146474482022-04-24 12:27:33114 days 18 hrs ago0x94a14774ffa8ac3122d2a57c2cc5886dd6288923 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00189381 23.‍24301112
0x51917591feccae9d94e25a151d4e25c4711c0e333bc96fa2c565b7461d578a81Notify Reward Am...145713832022-04-12 14:53:36126 days 16 hrs ago0x6dc28c1e1b843e4150169aab1cb28ccf9f5a5463 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍0079686150
0xab3e6c43e37517e0c1ab73d860e926fcb28867a91519aea098c810270886d69bSet Rewards Dura...145713202022-04-12 14:40:03126 days 16 hrs ago0x6dc28c1e1b843e4150169aab1cb28ccf9f5a5463 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍004359150
0xa97be9c09f163e2cafbda271370e790fefb69e940558851b772ff68db1dc1d8bStake145376372022-04-07 8:16:41131 days 23 hrs ago0xcd75c47b2ec49e92cc673269b53d1a75d023dfc9 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00305475 41.‍35818183
0x75f0c0f795e2490ef5b6c2647e439d39464a6e9559d058c88d9ac32b2bfce7c5Get Reward145375182022-04-07 7:46:02131 days 23 hrs ago0xcd75c47b2ec49e92cc673269b53d1a75d023dfc9 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍003596 46.‍95559999
0x93fa9335965a8d7ccd96e492f78593d5c8880885cce4d698bbe401ccd0e084ffGet Reward145343682022-04-06 20:09:25132 days 11 hrs ago0x8a6ad6dd70acba5f90acbfd094ea930099b48071 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00485368 49.‍21706159
0xd030e691cd37a3807e891a9cc528dd11960718ff199f71c186202b082d3e75e0Get Reward145301772022-04-06 4:18:58133 days 3 hrs ago0x9b3f49a186670194f625199b822fcbdfd3feacf7 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍0049842 61.‍17166556
0xdbf47e116784bd2f73819f68712e1055a503c9238d5daa04ed93918717b4b149Get Reward144158752022-03-19 8:47:05150 days 22 hrs ago0x9b3f49a186670194f625199b822fcbdfd3feacf7 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00209034 25.‍65495967
0x9e9415d4d7ea3a7aad121d1ef37052cfe367e1228e1532e36083c79bbafd308eGet Reward143461332022-03-08 12:15:13161 days 19 hrs ago0x94a14774ffa8ac3122d2a57c2cc5886dd6288923 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00167 20.‍4961341
0xdf755b3557363e0658a36dd9347d5f185874e6e5fe17219f52639f9e72a730e5Notify Reward Am...143410842022-03-07 17:33:35162 days 13 hrs ago0x6dc28c1e1b843e4150169aab1cb28ccf9f5a5463 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍0030758255
0xfabe8c1c2ace2acfad6cf00bb94c1ba955aec284879b9583817d41d28353db24Set Rewards Dura...143410582022-03-07 17:26:00162 days 13 hrs ago0x6dc28c1e1b843e4150169aab1cb28ccf9f5a5463 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍001433745
0xc14cfec0750c020e68c847dc62daf7a33065d1c31c23c1148937eaf34825e815Get Reward143307492022-03-06 2:50:24164 days 4 hrs ago0x8a6ad6dd70acba5f90acbfd094ea930099b48071 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00201197 24.‍68140663
0xce1c493c136d44356369402241ea316e7c8a8837a9a15e0adf3acb4ae8730452Get Reward143254182022-03-05 7:04:29165 days 17 mins ago0x9b3f49a186670194f625199b822fcbdfd3feacf7 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00196234 24.‍08410964
0x2e4f9230388c023f496e629e77a0a2e3b780c431fc7798d3be9b2e364c9fc3f6Get Reward143241692022-03-05 2:15:23165 days 5 hrs ago0x8a6ad6dd70acba5f90acbfd094ea930099b48071 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00402179 49.‍35986116
0x83f958244de529a55a2a64c0e8546af7ef17c3f2385ae083e28d2734d0e9e739Get Reward143058952022-03-02 6:10:22168 days 1 hr ago0x9b3f49a186670194f625199b822fcbdfd3feacf7 IN  0xa256d4bcddc26376cfba0fe0476098aabd6eb7e40 Ether0.‍00332429 40.‍79943872
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Contract Source Code Verified (Exact Match)

Contract Name:
StakingRewardsV2

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 1 : StakingRewardsV2.sol
// Sources flattened with buidler v1.4.3 https://buidler.dev

// File contracts/stakingv2/OwnedV2.sol

pragma solidity ^0.5.16;


// https://docs.synthetix.io/contracts/source/contracts/owned
contract OwnedV2 {
    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 {
        _onlyOwner();
        _;
    }

    function _onlyOwner() private view {
        require(msg.sender == owner, "Only the contract owner may perform this action");
    }

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


// File contracts/stakingv2/PausableV2.sol

pragma solidity ^0.5.16;

// Inheritance



// https://docs.synthetix.io/contracts/source/contracts/pausable
contract PausableV2 is OwnedV2 {
    uint public lastPauseTime;
    bool public paused;

    constructor() internal {
        // This contract is abstract, and thus cannot be instantiated directly
        require(owner != address(0), "Owner must be set");
        // Paused will be false, and lastPauseTime will be 0 upon initialisation
    }

    /**
     * @notice Change the paused state of the contract
     * @dev Only the contract owner may call this.
     */
    function setPaused(bool _paused) external onlyOwner {
        // Ensure we're actually changing the state before we do anything
        if (_paused == paused) {
            return;
        }

        // Set our paused state.
        paused = _paused;

        // If applicable, set the last pause time.
        if (paused) {
            lastPauseTime = now;
        }

        // Let everyone know that our pause state has changed.
        emit PauseChanged(paused);
    }

    event PauseChanged(bool isPaused);

    modifier notPaused {
        require(!paused, "This action cannot be performed while the contract is paused");
        _;
    }
}


// File openzeppelin-solidity-2.3.0/contracts/math/[email protected]

pragma solidity ^0.5.0;

/**
 * @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);
    }
}


// File openzeppelin-solidity-2.3.0/contracts/math/[email protected]

pragma solidity ^0.5.0;

/**
 * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        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-solidity/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) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        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) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}


// File openzeppelin-solidity-2.3.0/contracts/token/ERC20/[email protected]

pragma solidity ^0.5.0;

/**
 * @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.
     *
     * > 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 openzeppelin-solidity-2.3.0/contracts/token/ERC20/[email protected]

pragma solidity ^0.5.0;


/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @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.
     *
     * > Note that 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;
    }
}


// File openzeppelin-solidity-2.3.0/contracts/utils/[email protected]

pragma solidity ^0.5.0;

/**
 * @dev Collection of functions related to the address type,
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * This test is non-exhaustive, and there may be false-negatives: during the
     * execution of a contract's constructor, its address will be reported as
     * not containing a contract.
     *
     * > It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in 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;
    }
}


// File openzeppelin-solidity-2.3.0/contracts/token/ERC20/[email protected]

pragma solidity ^0.5.0;




/**
 * @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 ERC20;` 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));
    }

    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);
        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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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 openzeppelin-solidity-2.3.0/contracts/utils/[email protected]

pragma solidity ^0.5.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the `nonReentrant` modifier
 * available, which can be aplied 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.
 */
contract ReentrancyGuard {
    /// @dev counter to allow mutex lock with only one SSTORE operation
    uint256 private _guardCounter;

    constructor () internal {
        // The counter starts at one to prevent changing it from zero to a non-zero
        // value, which is a more expensive operation.
        _guardCounter = 1;
    }

    /**
     * @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() {
        _guardCounter += 1;
        uint256 localCounter = _guardCounter;
        _;
        require(localCounter == _guardCounter, "ReentrancyGuard: reentrant call");
    }
}


// File contracts/stakingv2/interfaces/IStakingRewardsV2.sol

pragma solidity >=0.4.24;


// https://docs.synthetix.io/contracts/source/interfaces/istakingrewards
interface IStakingRewardsV2 {
    // Views
    function lastTimeRewardApplicable() external view returns (uint256);

    function rewardPerToken() external view returns (uint256);

    function earned(address account) external view returns (uint256);

    function getRewardForDuration() external view returns (uint256);

    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    // Mutative

    function stake(uint256 amount) external;

    function withdraw(uint256 amount) external;

    function getReward() external;

    function exit() external;
}


// File contracts/stakingv2/StakingRewardsV2.sol

pragma solidity ^0.5.16;






// Inheritance




// https://docs.synthetix.io/contracts/source/contracts/stakingrewards
contract StakingRewardsV2 is IStakingRewardsV2, ReentrancyGuard, PausableV2 {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

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

    IERC20 public rewardsToken;
    IERC20 public stakingToken;
    uint256 public periodFinish = 0;
    uint256 public rewardRate = 0;
    uint256 public rewardsDuration = 7 days;
    uint256 public lastUpdateTime;
    uint256 public rewardPerTokenStored;

    mapping(address => uint256) public userRewardPerTokenPaid;
    mapping(address => uint256) public rewards;

    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;

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

    constructor(
        address _owner,
        address _rewardsToken,
        address _stakingToken
    ) public OwnedV2(_owner) {
        rewardsToken = IERC20(_rewardsToken);
        stakingToken = IERC20(_stakingToken);
    }

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

    function totalSupply() external view returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) external view returns (uint256) {
        return _balances[account];
    }

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

    function rewardPerToken() public view returns (uint256) {
        if (_totalSupply == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable().sub(lastUpdateTime).mul(rewardRate).mul(1e18).div(_totalSupply)
            );
    }

    function earned(address account) public view returns (uint256) {
        return _balances[account].mul(rewardPerToken().sub(userRewardPerTokenPaid[account])).div(1e18).add(rewards[account]);
    }

    function getRewardForDuration() external view returns (uint256) {
        return rewardRate.mul(rewardsDuration);
    }

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

    function stake(uint256 amount) external nonReentrant notPaused updateReward(msg.sender) {
        require(amount > 0, "Cannot stake 0");
        _totalSupply = _totalSupply.add(amount);
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        stakingToken.safeTransferFrom(msg.sender, address(this), amount);
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount) public nonReentrant updateReward(msg.sender) {
        require(amount > 0, "Cannot withdraw 0");
        _totalSupply = _totalSupply.sub(amount);
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        stakingToken.safeTransfer(msg.sender, amount);
        emit Withdrawn(msg.sender, amount);
    }

    function getReward() public nonReentrant updateReward(msg.sender) {
        uint256 reward = rewards[msg.sender];
        if (reward > 0) {
            rewards[msg.sender] = 0;
            rewardsToken.safeTransfer(msg.sender, reward);
            emit RewardPaid(msg.sender, reward);
        }
    }

    function exit() external {
        withdraw(_balances[msg.sender]);
        getReward();
    }

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

    function notifyRewardAmount(uint256 reward) external onlyOwner updateReward(address(0)) {
        if (block.timestamp >= periodFinish) {
            rewardRate = reward.div(rewardsDuration);
        } else {
            uint256 remaining = periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(rewardRate);
            rewardRate = reward.add(leftover).div(rewardsDuration);
        }

        // Ensure the provided reward amount is not more than the balance in the contract.
        // This keeps the reward rate in the right range, preventing overflows due to
        // very high values of rewardRate in the earned and rewardsPerToken functions;
        // Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
        uint balance = rewardsToken.balanceOf(address(this));
        require(rewardRate <= balance.div(rewardsDuration), "Provided reward too high");

        lastUpdateTime = block.timestamp;
        periodFinish = block.timestamp.add(rewardsDuration);
        emit RewardAdded(reward);
    }

    // Added to support recovering LP Rewards from other systems such as BAL to be distributed to holders
    function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyOwner {
        require(tokenAddress != address(stakingToken), "Cannot withdraw the staking token");
        IERC20(tokenAddress).safeTransfer(owner, tokenAmount);
        emit Recovered(tokenAddress, tokenAmount);
    }

    function setRewardsDuration(uint256 _rewardsDuration) external onlyOwner {
        require(
            block.timestamp > periodFinish,
            "Previous rewards period must be complete before changing the duration for the new period"
        );
        rewardsDuration = _rewardsDuration;
        emit RewardsDurationUpdated(rewardsDuration);
    }

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

    modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = lastTimeRewardApplicable();
        if (account != address(0)) {
            rewards[account] = earned(account);
            userRewardPerTokenPaid[account] = rewardPerTokenStored;
        }
        _;
    }

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

    event RewardAdded(uint256 reward);
    event Staked(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);
    event RewardPaid(address indexed user, uint256 reward);
    event RewardsDurationUpdated(uint256 newDuration);
    event Recovered(address token, uint256 amount);
}

Settings
{
  "metadata": {
    "useLiteralContent": false
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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lse,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"rewardPerTokenStored","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"rewardRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"rewards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"rewardsDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"rewardsToken","outputs":[{"internalType":"contract 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IERC20","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userRewardPerTokenPaid","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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

0000000000000000000000004b29444d24d30de6ce16616b32538224b3c41c7c000000000000000000000000c57d533c50bc22247d49a368880fb49a1caa39f700000000000000000000000005f661a1bd2da5e59c8e06b92acdcde2706110e5

-----Decoded View---------------
Arg [0] : _owner (address): 0x4b29444d24d30de6ce16616b32538224b3c41c7c
Arg [1] : _rewardsToken (address): 0xc57d533c50bc22247d49a368880fb49a1caa39f7
Arg [2] : _stakingToken (address): 0x05f661a1bd2da5e59c8e06b92acdcde2706110e5

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000004b29444d24d30de6ce16616b32538224b3c41c7c
Arg [1] : 000000000000000000000000c57d533c50bc22247d49a368880fb49a1caa39f7
Arg [2] : 00000000000000000000000005f661a1bd2da5e59c8e06b92acdcde2706110e5


Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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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.