Contract 0x7475b9eDfc13cdc994AeF39F67F5b4211515C873

 
 
Txn Hash Method
Block
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0x4f73d006730bd581d80e76a3236f5eafd6b10a2b688d87d92db22a060704a9ebExit240379622022-01-22 19:56:581 day 11 hrs ago0x92b19a44c81db4390caf8fb28c495acec8d3cb90 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.015662552945 173.147238999
0xb837fb3fc7372571feb31574aa6854dfaf75f0dd765ddaddc24637946c9e25a4Get Reward240379202022-01-22 19:55:301 day 11 hrs ago0x92b19a44c81db4390caf8fb28c495acec8d3cb90 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.012360931605 171.829956845
0x244750f1d783755f383d7101be05b81a6036c8e28752791114af52ea2a257186Exit223250452021-12-09 17:10:0945 days 14 hrs ago0x747276019e3340104c96397bf6537ad01f93d7df IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0051678550
0xbb1472210aa46324f9b0aa01659ea99a1bb8c1ba91500c773924253ab36f6091Exit222985882021-12-09 1:05:5346 days 6 hrs ago0x0dd3e554c9ca47cb3a7b5935a9743de812dfc010 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0031007130
0x3e9bd6ce21f968505e4ccc48ddd0a31731a970af570061c4094f87394321a3adStake With Permi...219660702021-11-30 7:44:2455 days 1 min ago0x43d3a26547438027de39ffd4b96c1ed7ea4b16cc IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.016275392136
0x30c6403b350c49a983913ee31f374300d5b527dbca8d7a95184b2fbb6064e5d5Get Reward217781802021-11-25 8:52:4659 days 22 hrs ago0x1f17ba620c4f9745428a9224acf9d0fafc0d3d38 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0027831630
0x0746bf6685efbddb91b618b70ad0927499fc4df16385d4987fbe12ab46d26359Stake217781452021-11-25 8:51:3259 days 22 hrs ago0x1f17ba620c4f9745428a9224acf9d0fafc0d3d38 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0032003430
0xca575bbe7f9eceebb9e74b6b88b1ce66640dbbf6b1ca6692609b381190476849Exit217465782021-11-24 13:27:2760 days 18 hrs ago0xf4f1c36803b6f7dc61089a0ee5d581ef012b5632 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0063034550
0x8a90c60d6675c7da8c160f2994c9f1f6b4857cdf89cb0a11651ba99d319ddbbdStake With Permi...217291782021-11-24 2:27:5661 days 5 hrs ago0xf4f1c36803b6f7dc61089a0ee5d581ef012b5632 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0035894430
0x21935e5745b7ae9cfbafb5c41bdf971f3cc50a726f2bef3f01c6ddd5a6884c54Get Reward213275652021-11-13 16:17:3371 days 15 hrs ago0x747276019e3340104c96397bf6537ad01f93d7df IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.00249717633
0x43fcce8cea3922b2ff28a232d64654608bd071f7b0122221a5ab70a5e05ac375Exit212243652021-11-10 22:32:5474 days 9 hrs ago0xdd686cd83840d180a01234e43bd606c976202f36 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0032690730
0x01e31ce64a11cd5e608632a848a4e7320a023bdd66bf496ec0041adf97521245Stake With Permi...211619682021-11-09 8:30:4275 days 23 hrs ago0xdd686cd83840d180a01234e43bd606c976202f36 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0041031630
0xa4777cd9cee8aa27294a9250810fde32ef5a666b91bcf46bd38bfa8c5c568331Get Reward211179702021-11-08 5:17:3177 days 2 hrs ago0x747276019e3340104c96397bf6537ad01f93d7df IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.002513491239.6
0x20284477927b1366f5bf197fb1ef0be2086a7fca477c391ded77f6a0f18420e7Exit206320962021-10-26 12:54:4589 days 18 hrs ago0x95626d1481979adf68604e50bd088ac163d394a8 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0037820730
0x4185c62296f1c823028928eafc548cdfbf658417cf410377d49ff18c3e1ff426Stake206244752021-10-26 7:53:2689 days 23 hrs ago0x747276019e3340104c96397bf6537ad01f93d7df IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.00237454833
0x379ab2f2d366280bc4f8b931580d95f86955f237f0fded35e4442245ce3f641fStake206234502021-10-26 7:09:3390 days 36 mins ago0x747276019e3340104c96397bf6537ad01f93d7df IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.00237454833
0x7fcfebb64229207ff35796b14bf67ae896132e9fc20d1069f339e0ba4259f2c5Stake205977642021-10-25 14:08:1290 days 17 hrs ago0x747276019e3340104c96397bf6537ad01f93d7df IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.00237454833
0x44b751d22e5f542a57134e8c5f50dc8ca87ffc0f61360ad638f9027811a1e2d2Exit204394912021-10-21 4:47:3095 days 2 hrs ago0x888af77f5f6b650b118c7c85e263ede1d5ca6429 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0029030730
0x1eb391e02c57eb4e727033082fdcab703a54c98552a0e57d98150681ba575a4bExit204177362021-10-20 14:15:1795 days 17 hrs ago0x6649dad69e7994f329bb5f0a829c82b838815a56 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0037820730
0xf7b297cdda56d127ea86da4271ac4f35ef6f8a3b890fafd14b690b3dd3b51371Exit204080782021-10-20 7:41:2996 days 4 mins ago0x032865e6e27e90f465968ffc635900a4f7ceeb84 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0037820730
0x718c20eab699f511eba525ab4da3f9d86910fab93a9c1d86f6b47adaab8e0e8eGet Reward203734302021-10-19 8:13:0596 days 23 hrs ago0x92b19a44c81db4390caf8fb28c495acec8d3cb90 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0003704385963.993
0x07be762d7782d0d54aed4538531254a0613c65ab9272d2fb90e27d6662699d7eStake203293972021-10-18 0:44:1998 days 7 hrs ago0x747276019e3340104c96397bf6537ad01f93d7df IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0021583230
0x48a8e29bc5bd1d55f5d1a70a9958ff8682093510eaab5420f978442eea3a0cadExit202953642021-10-17 1:02:5599 days 6 hrs ago0x7a2fd968d8478bfb4682b1043b9dc70f74c9d115 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0032690730
0x0c75e53d34e0cf1fbfed9e5e7cb506e9e8fb8fc5843fdf34f8e6e41b6868351fStake202489662021-10-15 16:29:20100 days 15 hrs ago0x747276019e3340104c96397bf6537ad01f93d7df IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.00237415233
0x2bb967e486b7adad037556c7ae3caac29bb88114823936b22dc3ded0b6a1e8acExit202222822021-10-14 21:24:58101 days 10 hrs ago0xaac47eb5f33b5cad8b5637a9f3f024ccbe751653 IN  0x7475b9edfc13cdc994aef39f67f5b4211515c8730 MATIC0.0032690730
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0xa6d5ab18301323c15c34728805f15fb1a8f59683288aa2bdc2ddda7e02174680199119732021-10-06 15:47:58109 days 15 hrs ago 0x8aaa5e259f74c8114e0a471d9f2adfc66bfe09ed  Contract Creation0 MATIC
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xbB703E95348424FF9e94fbE4FB524f6d280331B8

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 2021-10-07
*/

/**
 *Submitted for verification at polygonscan.com on 2021-10-06
*/

/**
 *Submitted for verification at polygonscan.com on 2021-06-30
*/

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

pragma solidity ^0.5.16;

/**
 * @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 Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be aplied to your functions to restrict their use to
 * the owner.
 */
contract Ownable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * > Note: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

/**
 * @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 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 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");
    }
}

// Inheritance
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 StakingRewardsFactory is Ownable {
    // immutables
    address public rewardsToken;
    uint public stakingRewardsGenesis;

    // the staking tokens for which the rewards contract has been deployed
    address[] public stakingTokens;

    // info about rewards for a particular staking token
    struct StakingRewardsInfo {
        address stakingRewards;
        uint rewardAmount;
        uint duration;
    }

    // rewards info by staking token
    mapping(address => StakingRewardsInfo) public stakingRewardsInfoByStakingToken;

    constructor(
        address _rewardsToken,
        uint _stakingRewardsGenesis
    ) Ownable() public {
        require(_stakingRewardsGenesis >= block.timestamp, 'StakingRewardsFactory::constructor: genesis too soon');

        rewardsToken = _rewardsToken;
        stakingRewardsGenesis = _stakingRewardsGenesis;
    }

    ///// permissioned functions

    // deploy a staking reward contract for the staking token, and store the reward amount
    // the reward will be distributed to the staking reward contract no sooner than the genesis
    function deploy(address stakingToken, uint rewardAmount, uint256 rewardsDuration) public onlyOwner {
        StakingRewardsInfo storage info = stakingRewardsInfoByStakingToken[stakingToken];
        require(info.stakingRewards == address(0), 'StakingRewardsFactory::deploy: already deployed');

        info.stakingRewards = address(new StakingRewards(/*_rewardsDistribution=*/ address(this), rewardsToken, stakingToken));
        info.rewardAmount = rewardAmount;
        info.duration = rewardsDuration;
        stakingTokens.push(stakingToken);
    }

    function update(address stakingToken, uint rewardAmount, uint256 rewardsDuration) public onlyOwner {
        StakingRewardsInfo storage info = stakingRewardsInfoByStakingToken[stakingToken];
        require(info.stakingRewards != address(0), 'StakingRewardsFactory::update: not deployed');

        info.rewardAmount = rewardAmount;
        info.duration = rewardsDuration;
    }



    ///// permissionless functions

    // call notifyRewardAmount for all staking tokens.
    function notifyRewardAmounts() public {
        require(stakingTokens.length > 0, 'StakingRewardsFactory::notifyRewardAmounts: called before any deploys');
        for (uint i = 0; i < stakingTokens.length; i++) {
            notifyRewardAmount(stakingTokens[i]);
        }
    }

    // notify reward amount for an individual staking token.
    // this is a fallback in case the notifyRewardAmounts costs too much gas to call for all contracts
    function notifyRewardAmount(address stakingToken) public {
        require(block.timestamp >= stakingRewardsGenesis, 'StakingRewardsFactory::notifyRewardAmount: not ready');

        StakingRewardsInfo storage info = stakingRewardsInfoByStakingToken[stakingToken];
        require(info.stakingRewards != address(0), 'StakingRewardsFactory::notifyRewardAmount: not deployed');

        if (info.rewardAmount > 0 && info.duration > 0) {
            uint rewardAmount = info.rewardAmount;
            uint256 duration = info.duration;
            info.rewardAmount = 0;
            info.duration = 0;

            require(
                IERC20(rewardsToken).transfer(info.stakingRewards, rewardAmount),
                'StakingRewardsFactory::notifyRewardAmount: transfer failed'
            );
            StakingRewards(info.stakingRewards).notifyRewardAmount(rewardAmount, duration);
        }
    }

    function pullExtraTokens(address token, uint256 amount) external onlyOwner {
        IERC20(token).transfer(msg.sender, amount);
    }
}

Contract Security Audit

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://897be89e7660172356b0488be48b5d67058a5380c1451f8e2232f67003536bf1
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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