Contract 0xd52D48Db08e8224ef6E2be8F54f3c84e790b1c32

 
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0x6590fcfb38bfdbf7fb4f57619327aa98739468efc0ec6ed7c273607b12c730d8Exit126897372021-06-23 10:03:092 hrs 15 mins ago0x0cf21ac62978f6d9ca191041cd35abd2bbcc3532 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00145533311
0x553371ee31774f28ee8b60b3eb4b7784e576fcd44eaceb4e52e3878de6c13d31Get Reward126884442021-06-23 4:55:107 hrs 23 mins ago0x95b86901e6c23a493c1af8f85a4c697a5c626614 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00194989221
0x4e5b8876a838b6c5d6346a26da1b2fbc1566609a8bd4a3e85d097d5e4eda726cGet Reward126883882021-06-23 4:44:127 hrs 34 mins ago0xdd15c08320f01f1b6348b35eebe29fdb5ca0cda6 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00120748819
0x112601a239c6679ccc0e877f96e8ac4a20e7276a91bfce9a6a0c14803aac2dfbGet Reward126882452021-06-23 4:15:308 hrs 2 mins ago0xa626bd40a8c88f59a4cf9b1821a7bd71fad96285 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00167133618
0x79dd02f7252dc6020454065c2d9f44d9701a3a8535436cd55537cabb859e9bd7Exit126873602021-06-23 0:52:5511 hrs 25 mins ago0xf1fb52c1aee4a4a7b26d9ad2bf2352d837b28a37 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00449291739
0x3f2fa4c76695edeee0cce74e4c00b01d73a21499fd2f599c08b8a8b17210498eWithdraw126868212021-06-22 22:46:0913 hrs 32 mins ago0xdd15c08320f01f1b6348b35eebe29fdb5ca0cda6 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00399455737
0x93cfa5be7db4e818ee81e15f5969a1179af3e4780947db3a185eeccbbe799634Stake126866672021-06-22 22:09:0014 hrs 9 mins ago0xdd15c08320f01f1b6348b35eebe29fdb5ca0cda6 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00471918646
0xcbc7c79d4d266bde6703799c94a62022a66de0593b613ba12df5e3fae146b9e5Stake126861532021-06-22 20:21:3115 hrs 56 mins ago0xdd15c08320f01f1b6348b35eebe29fdb5ca0cda6 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00432330237
0x2d37de729c15d07fc459ea94840e4287bfb6679f5a261274433166701eb6ef1fExit126842052021-06-22 13:12:2323 hrs 5 mins ago0x768d95166ed5e1780d3631756446c44c77e1af39 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.0221950344184.8
0x33a0d982ac20a45db07a0ff00ebee7b929339261f0123b9b8e6cf861fb030ff3Exit126838012021-06-22 11:40:451 day 37 mins ago0x370a5275f69cb3c2e76cfe575cf7f846f906b34d IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00319309331
0x066598038c0d99fb04524a2c1d74a7e276b41deeb833abe3cdc9bd8947700a34Exit126834662021-06-22 10:24:501 day 1 hr ago0x9aa3c333db23e3ac2c4ef2c2aae57f97bc76c0cc IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00633616514255.000001235
0x9d8bb1c956086d43c868e303c881a42708ae4d5df70f2b96a307c2935933aa87Get Reward126834282021-06-22 10:14:381 day 2 hrs ago0x590dfbd53781c6d9d8404eb8e1847fea1afad319 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.0041783445
0x63fc32a847e5337d0219671caae7b05df2fc57791194612c1116214ef3bc2b67Get Reward126830242021-06-22 8:41:201 day 3 hrs ago0x95b86901e6c23a493c1af8f85a4c697a5c626614 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.0032498235
0x26b83a7a946837f0025ab2e8eb7fb3bf9871ad17b41e66635103a9a4123c4e88Stake126770862021-06-21 10:27:472 days 1 hr ago0x1f9bb27d0c66feb932f3f8b02620a128d072f3d8 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00229415823
0xc36d46d9d442bea2225b24c344d3d25a6775c38c29a9696d369bc1862a14d0f5Exit126770202021-06-21 10:11:412 days 2 hrs ago0x1f9bb27d0c66feb932f3f8b02620a128d072f3d8 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00195705719
0x79b6f61d3b9ccd667a55acf8811f6a1a78b1246a05528d09b3c7776804f7bcc4Get Reward126766602021-06-21 8:49:282 days 3 hrs ago0xe895084850c04af3a57fdd90c0ba42ba440bc3a8 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00249981633
0x184db477a1c74edbcd624b7baf058bce5fb496a827e5aa5bc7db6f0880363f4aGet Reward126751252021-06-21 2:47:502 days 9 hrs ago0x95b86901e6c23a493c1af8f85a4c697a5c626614 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00148563216
0xf7d9a43bf470f97c7b69ed2ac58edf865d3498835eef3c2f16d5f5632f6483f9Get Reward126725402021-06-20 17:28:422 days 18 hrs ago0xb5cb4b95676b1c0259b3f3686bb9290ed9c8171c IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.0009285210
0x9688fb0bda9cbbbb8f56ae9b31a6557a0bb255d29eeed41020e6dfc88512c142Stake126713652021-06-20 13:02:382 days 23 hrs ago0x647e25658b3f6fed1eac054816a1571bd9dceff4 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00259339626
0x455d5eaaaca251d44d328ab47c6fc0a66f39d29936f561a22a6cf302a9db6a0bGet Reward126697592021-06-20 6:56:163 days 5 hrs ago0x5be876ed0a9655133226be302ca6f5503e3da569 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.0007575210
0x677165e52149b3602c6fd888016c67df021f648fad7fece549078cc6d18d430aGet Reward126691542021-06-20 4:37:133 days 7 hrs ago0xa626bd40a8c88f59a4cf9b1821a7bd71fad96285 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.00102137211
0xa3b0d12335078c3f3915dd82a3ce3c4785ca864f3c2f80ea49e2618c6671e57eGet Reward126688782021-06-20 3:32:373 days 8 hrs ago0x288fc73d726823fbfeecf42f642b8798de34a7d0 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.0007575210
0x819116d429ad3eb0e43ef68d5f4753275e41d9068fe0bbacded29f62f75c1369Exit126688462021-06-20 3:24:163 days 8 hrs ago0x04287dc8c78f605812d00c102663ebcec851e1c2 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.0011520310
0xb618b002ed566f0abfc29a4f9d324928d6f859330936716a739ca7ceaeab767aGet Reward126687272021-06-20 3:00:393 days 9 hrs ago0xd585cbcb0a390c2a2fd6b887e835ee8cc362566c IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.0006499647
0x30a1e2f44361f992377aa809e1c7f4648a62886047f64839c7ceaf9e3f0ac465Get Reward126685282021-06-20 2:19:023 days 9 hrs ago0x04287dc8c78f605812d00c102663ebcec851e1c2 IN  0xd52d48db08e8224ef6e2be8f54f3c84e790b1c320 Ether0.0009285210
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Contract Source Code Verified (Similar Match)
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xD09607e80936f6abf35eee75E77115a93A5FE9D5

Contract Name:
StakingRewards

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity Multiple files format)

File 11 of 11: StakingRewards.sol
pragma solidity ^0.5.16;

import "./Math.sol";
import "./SafeMath.sol";
import "./ERC20Detailed.sol";
import "./SafeERC20.sol";
import "./ReentrancyGuard.sol";

// Inheritance
import "./IStakingRewards.sol";
import "./Pausable.sol";


// https://docs.synthetix.io/contracts/source/contracts/stakingrewards
contract StakingRewards is IStakingRewards, ReentrancyGuard, Pausable {
    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 = 30 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 Owned(_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);
}

File 1 of 11: Address.sol
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 2 of 11: ERC20Detailed.sol
pragma solidity ^0.5.0;

import "./IERC20.sol";

/**
 * @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 3 of 11: IERC20.sol
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 4 of 11: IStakingRewards.sol
pragma solidity >=0.4.24;


// https://docs.synthetix.io/contracts/source/interfaces/istakingrewards
interface IStakingRewards {
    // 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 5 of 11: Math.sol
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 6 of 11: Owned.sol
pragma solidity ^0.5.16;


// https://docs.synthetix.io/contracts/source/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 {
        _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 7 of 11: Pausable.sol
pragma solidity ^0.5.16;

// Inheritance
import "./Owned.sol";


// https://docs.synthetix.io/contracts/source/contracts/pausable
contract Pausable is Owned {
    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 8 of 11: ReentrancyGuard.sol
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 9 of 11: SafeERC20.sol
pragma solidity ^0.5.0;

import "./IERC20.sol";
import "./SafeMath.sol";
import "./Address.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 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 10 of 11: SafeMath.sol
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;
    }
}

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 IERC20","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"bool","name":"_paused","type":"bool"}],"name":"setPaused","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"_rewardsDuration","type":"uint256"}],"name":"setRewardsDuration","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"stake","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"stakingToken","outputs":[{"internalType":"contract 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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Swarm Source

bzzr://4f50d0f8a3e01c49fb8b689c54e65ccf8d7c526d904903c5fca0519b605f71aa
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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