Contract 0xB26bfcD52D997211C13aE4C35E82ced65AF32A02

 
Txn Hash
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0x1d980f53c2cea2e286bde9cb6b25b6e7309c0e3b7495dc7681de4adbe558a7a3173582132021-07-28 11:21:469 mins ago0x46ee7bea049cd2d728fa8267be826c6953362af7 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.0003558304
0xaf5843842fadeb57247579a476ffa11840b739c3a3bbdbe20de85f42c307a88b173574532021-07-28 10:43:4547 mins ago0xf5843921d670d036afc426cdcd4f8a1f5a835145 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.00035529435
0x61a610ec030d1a5d465c1a36da17a5472c7d47a13ce767ffd1b7e922b9ce4c97173574532021-07-28 10:43:4547 mins ago0xf5843921d670d036afc426cdcd4f8a1f5a835145 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.0001136289
0x0fd15413b045854ddde956c0ebdbb28608560e42ef5195787b171515abfad3e2173569302021-07-28 10:17:151 hr 14 mins ago0x287b7fc731d04a8055efc2dc5e4cfb25f9d9ac1e IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.000098587
0x085f3e9130e3caedf9d4de701c20eb5a11a484cb1f4e60398956510a4fd34025173552772021-07-28 9:05:162 hrs 26 mins ago0xac78647643d03d688eb33161e0752d4b1dec3168 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.000162974
0xa12462001bc5daef1d4be70eb2bd9cd7e8a685d578a4a0bc517997eaf7591e0e173534262021-07-28 7:59:263 hrs 31 mins ago0xc1daabfacb63a438c99b9e9dfb3ae2c6e76dbbf6 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.000098587
0xb4a3a64586cd4fcf847f9f0d811fdf7aa846aeb7393aa1553d6eed1a4f671279173534192021-07-28 7:59:123 hrs 32 mins ago0xedb7523277d041ffea5a736fb2149c13dafce815 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.0001059331
0xa1e1982461861f1be2e2bb27a8312c262014a12bc5fbaa92e10e00c40109c78c173531922021-07-28 7:51:153 hrs 40 mins ago0x48a2a59990c145e996d0c93edf22d8dce8c7d2bb IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.000081975922
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0xa8909b5559e3dfa879c08a5586069ebf66972e5cff3c1822228578cbc9b5528d173502342021-07-28 5:56:445 hrs 34 mins ago0x7fe4a51b1e610dcf87f2669b03ef9d4b66b85ca8 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.00019815987
0x834aaeb968f0593534870205c649e2f923d2201e37638e02ae0a59dd3b8892fb173501852021-07-28 5:55:025 hrs 36 mins ago0x7564a990a5cc59f59e90a98202e7d67c7af70202 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.00012082024
0x2d8820e9fc3ce4779bd6c70cde1aa81a59e684b18c2419caff7c4daf36365623173483142021-07-28 4:45:306 hrs 45 mins ago0x15f5c356656abba5a4b51f342b65a2b0ed36ab71 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.00136724
0x717ca5d2f796fd05d2989ee5f8c458419dff5fe68f34378f668dfa342d2fe86c173468712021-07-28 3:51:357 hrs 39 mins ago0x6a9a8e67dbe22af0bb55ea0fa44df8212b175a1d IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.000154939141
0xc8acb90cef50677bc9330337c3d70ee5db642eef30edb87141757e157bbb4a86173466082021-07-28 3:42:337 hrs 48 mins ago0xd6fb642d550c65e3f8306ced3bfeee1caae0e72b IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.000098587
0xfb14750643982d1b51fa9d0693f8c47c94ead7071ad20c6dfb08891f0c8caed7173452402021-07-28 2:51:178 hrs 39 mins ago0x519c11e412fd81c76291ff5da473f61e0ec87bb2 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.000409154375
0x7d07a4267fb598e4e9c6c935b94b43acd42f63d3fc2595f6c6ae371638f38e22173443532021-07-28 2:16:259 hrs 14 mins ago0x66912b4ca378ccb8afcb41028edec4b786127194 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.000264807
0x3e9e5779615012eab6f5e6b2b4d44eefa00550a5c02b6dab9342b4827ffd5e99173441392021-07-28 2:09:059 hrs 22 mins ago0x8181bf635957e37aa25320b3299285bf942cd141 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.00008800596
0x61f8705d9af5a50af124adcdd3687eedcbc9224a644322547557da6a9cc12a07173440322021-07-28 2:05:239 hrs 25 mins ago0x1d945e9ea2da9cb9a36b3e53e78b5e22bea1e3d9 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.00008800596
0x35ae74e7905093bc3a78785512b4c26b1928457fffef54ac63055b89999b9ac1173438842021-07-28 2:00:199 hrs 30 mins ago0x8cecb721b5cfea53c970be0cb5935f05fd1c16de IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.00005978988
0x3d7da84c773b9c7cab853b7281e9b0049e03e9b6708b20f491452a8c601c71b3173438682021-07-28 1:59:439 hrs 31 mins ago0x8cecb721b5cfea53c970be0cb5935f05fd1c16de IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.000123966861
0xb004a073cfb0c4bba012fa34684356d8f47506ba60b2569580deec42e8affbac173430272021-07-28 1:24:2510 hrs 6 mins ago0x66912b4ca378ccb8afcb41028edec4b786127194 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.000316143
0x40cac5f8c0f640c4c260852a55833747734937a3c25cd255bc81fb64d2fb85d0173415062021-07-28 0:27:2911 hrs 3 mins ago0xb071ddee62b8ce2bbec077d8528f351b52dbde91 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.000166939997
0xa9298f25d1c78551d93b22978e19cf8cce9920a0eb69436688217c454591efc4173410932021-07-28 0:13:1511 hrs 18 mins ago0x83add701412dead70be05dd54b4708517417a6b6 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.00008784362
0x9e666f8e8a27e4078412be4aea621beced462492f4165f9cfcf3d2e2f85e6a31173408202021-07-28 0:03:5311 hrs 27 mins ago0x83add701412dead70be05dd54b4708517417a6b6 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.000108722724
0x76ba7e85dabed9acabb069724011843bc368c8d2ce12bc0007401bf269b835ba173407302021-07-28 0:00:4511 hrs 30 mins ago0x83add701412dead70be05dd54b4708517417a6b6 IN  0xb26bfcd52d997211c13ae4c35e82ced65af32a020 MATIC0.0000762157
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0xd9012a7a8e4bfe624c8bd797654db192cad30e3a189487a6a7ff0e403e5791dc138370172021-04-28 13:36:4190 days 21 hrs ago 0x5eec262b05a57da9beb5fe96a34aa4ed0c5e029f  Contract Creation0 MATIC
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Contract Source Code Verified (Similar Match)
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x4a73218ef2e820987c59f838906a82455f42d98b

Contract Name:
StakingRewards

Compiler Version
v0.5.17+commit.d19bba13

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at polygonscan.com on 2021-06-16
*/

/**
 *Submitted for verification at Etherscan.io on 2020-09-16
*/

pragma solidity ^0.5.16;

/**
 * @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);
    }
}

/**
 * @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;
    }
}

/**
 * @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);
}

/**
 * @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;
    }
}


/**
 * @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;
    }
}

/**
 * @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");
        }
    }
}

/**
 * @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");
    }
}

// Inheritancea
interface IStakingRewards {
    // Views
    function lastTimeRewardApplicable() external view returns (uint256);

    function rewardPerToken() external view returns (uint256);

    function earned(address account) 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;
}

contract RewardsDistributionRecipient {
    address public rewardsDistribution;

    function notifyRewardAmount(uint256 reward, uint256 duration) external;

    modifier onlyRewardsDistribution() {
        require(msg.sender == rewardsDistribution, "Caller is not RewardsDistribution contract");
        _;
    }
}

contract StakingRewards is IStakingRewards, RewardsDistributionRecipient, ReentrancyGuard {
    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 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 _rewardsDistribution,
        address _rewardsToken,
        address _stakingToken
    ) public {
        rewardsToken = IERC20(_rewardsToken);
        stakingToken = IERC20(_stakingToken);
        rewardsDistribution = _rewardsDistribution;
    }

    /* ========== 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]);
    }

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

    function stakeWithPermit(uint256 amount, uint deadline, uint8 v, bytes32 r, bytes32 s) external nonReentrant updateReward(msg.sender) {
        require(amount > 0, "Cannot stake 0");
        _totalSupply = _totalSupply.add(amount);
        _balances[msg.sender] = _balances[msg.sender].add(amount);

        // permit
        IUniswapV2ERC20(address(stakingToken)).permit(msg.sender, address(this), amount, deadline, v, r, s);

        stakingToken.safeTransferFrom(msg.sender, address(this), amount);
        emit Staked(msg.sender, amount);
    }

    function stake(uint256 amount) external nonReentrant 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, uint256 rewardsDuration) external onlyRewardsDistribution updateReward(address(0)) {
        require(block.timestamp.add(rewardsDuration) >= periodFinish, "Cannot reduce existing period");

        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, periodFinish);
    }

    /* ========== 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, uint256 periodFinish);
    event Staked(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);
    event RewardPaid(address indexed user, uint256 reward);
}

interface IUniswapV2ERC20 {
    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
}

Contract ABI

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IERC20","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"stake","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"stakeWithPermit","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://c322ba88562bdec7ebb3d5d1adca9437e9d31218e4f8288f93c7a548433b0b3b
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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