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Exit1468876942026-01-25 20:49:255 hrs ago1769374165IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000195080.00014939
Exit1468811372026-01-25 17:10:519 hrs ago1769361051IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000095830.00006198
Exit1468749212026-01-25 13:43:3912 hrs ago1769348619IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000058350.00004589
Get Reward1468749192026-01-25 13:43:3512 hrs ago1769348615IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000042350.00004672
Exit1468736842026-01-25 13:02:2513 hrs ago1769346145IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000120230.000102
Get Reward1468736092026-01-25 12:59:5513 hrs ago1769345995IN
Hop Protocol: ETH Rewards Contract
0 ETH0.000000008330.00010206
Get Reward1468718062026-01-25 11:59:4914 hrs ago1769342389IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000019680.00001621
Exit1468656052026-01-25 8:33:0717 hrs ago1769329987IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000048680.00004593
Get Reward1468656032026-01-25 8:33:0317 hrs ago1769329983IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000047290.00004592
Exit1468651992026-01-25 8:19:3518 hrs ago1769329175IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000169140.00010482
Exit1468566072026-01-25 3:33:1122 hrs ago1769311991IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000122350.00008313
Exit1468548152026-01-25 2:33:2723 hrs ago1769308407IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000038680.00002153
Exit1468530572026-01-25 1:34:5124 hrs ago1769304891IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000065810.00004326
Exit1468465192026-01-24 21:56:5528 hrs ago1769291815IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000007930.00000224
Exit1468446992026-01-24 20:56:1529 hrs ago1769288175IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000029530.00002113
Get Reward1468446962026-01-24 20:56:0929 hrs ago1769288169IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000024860.00002113
Exit1468426392026-01-24 19:47:3530 hrs ago1769284055IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000134510.00010049
Exit1468316882026-01-24 13:42:3336 hrs ago1769262153IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000051430.00002821
Exit1468268382026-01-24 11:00:5339 hrs ago1769252453IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000042630.00002421
Exit1468258872026-01-24 10:29:1139 hrs ago1769250551IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000049890.00004558
Get Reward1468258832026-01-24 10:29:0339 hrs ago1769250543IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000044070.00004106
Exit1468256372026-01-24 10:20:5140 hrs ago1769250051IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000076630.00004341
Exit1468245232026-01-24 9:43:4340 hrs ago1769247823IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000048590.00002661
Exit1468244322026-01-24 9:40:4140 hrs ago1769247641IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000042120.00003219
Get Reward1468243382026-01-24 9:37:3340 hrs ago1769247453IN
Hop Protocol: ETH Rewards Contract
0 ETH0.0000000034710.00003233
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1075578702023-07-30 10:55:17910 days ago1690714517
Hop Protocol: ETH Rewards Contract
0 ETH
1075549572023-07-30 9:18:11910 days ago1690708691
Hop Protocol: ETH Rewards Contract
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1075549572023-07-30 9:18:11910 days ago1690708691
Hop Protocol: ETH Rewards Contract
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1075548172023-07-30 9:13:31910 days ago1690708411
Hop Protocol: ETH Rewards Contract
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1075523322023-07-30 7:50:41910 days ago1690703441
Hop Protocol: ETH Rewards Contract
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1075523322023-07-30 7:50:41910 days ago1690703441
Hop Protocol: ETH Rewards Contract
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1075523002023-07-30 7:49:37910 days ago1690703377
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1075499162023-07-30 6:30:09910 days ago1690698609
Hop Protocol: ETH Rewards Contract
0 ETH
1075483032023-07-30 5:36:23910 days ago1690695383
Hop Protocol: ETH Rewards Contract
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1075481992023-07-30 5:32:55910 days ago1690695175
Hop Protocol: ETH Rewards Contract
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1075467142023-07-30 4:43:25910 days ago1690692205
Hop Protocol: ETH Rewards Contract
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1075449072023-07-30 3:43:11910 days ago1690688591
Hop Protocol: ETH Rewards Contract
0 ETH
1075449072023-07-30 3:43:11910 days ago1690688591
Hop Protocol: ETH Rewards Contract
0 ETH
1075448562023-07-30 3:41:29910 days ago1690688489
Hop Protocol: ETH Rewards Contract
0 ETH
1075435112023-07-30 2:56:39910 days ago1690685799
Hop Protocol: ETH Rewards Contract
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1075407402023-07-30 1:24:17911 days ago1690680257
Hop Protocol: ETH Rewards Contract
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1075407402023-07-30 1:24:17911 days ago1690680257
Hop Protocol: ETH Rewards Contract
0 ETH
1075407402023-07-30 1:24:17911 days ago1690680257
Hop Protocol: ETH Rewards Contract
0 ETH
1075407402023-07-30 1:24:17911 days ago1690680257
Hop Protocol: ETH Rewards Contract
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1075402242023-07-30 1:07:05911 days ago1690679225
Hop Protocol: ETH Rewards Contract
0 ETH
1075360402023-07-29 22:47:37911 days ago1690670857
Hop Protocol: ETH Rewards Contract
0 ETH
1075326282023-07-29 20:53:53911 days ago1690664033
Hop Protocol: ETH Rewards Contract
0 ETH
1075319042023-07-29 20:29:45911 days ago1690662585
Hop Protocol: ETH Rewards Contract
0 ETH
1075319042023-07-29 20:29:45911 days ago1690662585
Hop Protocol: ETH Rewards Contract
0 ETH
1075318412023-07-29 20:27:39911 days ago1690662459
Hop Protocol: ETH Rewards Contract
0 ETH
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Latest 25 Deposits

L2 Txn Hash L1 Deposit Txn Value Token
0x1f78cf6831bde2a4907365d9153cf73a8c3b8e6b6813882aadc058d9aceabd1f2025-05-02 3:05:31268 days ago1746155131346,800 Hop (HOP)
0x48b74362f4567310c3c395dac419666f01b28acd1357facf1812ab2b0de9a2dd2025-04-05 3:19:25295 days ago1743823165346,800 Hop (HOP)
0x09edec1a725ef3a1f7b69ba34455dd5868b3577199735d3966abfefc12f4ec3a2025-03-11 2:05:17321 days ago1741658717346,800 Hop (HOP)
0xed527d25755795932e0cdecf52f112a1cb525160001ed06d2d224fe8cc837c192025-02-08 4:24:29351 days ago1738988669346,800 Hop (HOP)
0x0ae2fa2ae9da465ce069e0409316357a9cbee7cfbe5789d7c7a8881bd1b6012d2025-01-08 21:33:37382 days ago1736372017346,800 Hop (HOP)
0x9ef27c27f3853feac29a2a7ea07395ffaea7f9a2dab2e0fb46bac3d5145179182024-12-14 17:35:33407 days ago1734197733346,800 Hop (HOP)
0x1e6d1537bc94af24dcfd17b7116a0f6b84230d9769e268737e79f24483bd93262024-11-16 14:01:47435 days ago1731765707346,800 Hop (HOP)
0x17a5b9e96eaebe9fa3681607394f3b144025742d07f23086b429f47e5a4d1d742024-10-17 22:49:23465 days ago1729205363346,800 Hop (HOP)
0xa7b635f259cabc97a8d7075cd5e23c678da3ba1492e783559da53df2be29ce622024-09-19 22:52:41493 days ago1726786361346,800 Hop (HOP)
0x1e61eae6b0ee09656d16cf7f15e3e27305ca2cc77493a95d4bf97ee89cf5dd332024-08-22 1:25:57522 days ago1724289957346,800 Hop (HOP)
0x143a995997190b80dcdb16cbd891c000665c02ad564acb589a3d3317f1efda792024-07-25 19:42:51549 days ago1721936571346,800 Hop (HOP)
0xf6d4e6c3c8367e7ef9f331954184a622253065d57278c28045a115ec3238925c2024-07-01 15:27:29573 days ago1719847649346,800 Hop (HOP)
0xd0767f7b7eeb160962c28772c1501df698eb1b1a25e19bd80033776b947ace012024-05-30 23:18:33605 days ago1717111113346,800 Hop (HOP)
0x0fd074c60ced1a416fa4b5f67c2d2a49f2e2bc5a5e46caddbed59d4bcc665e772024-05-04 8:11:23631 days ago1714810283346,800 Hop (HOP)
0xbe4d13e978ee75fe7cd20ca3e5cf6368f121caf4c5d52adac0a23efb06e7351a2024-04-03 18:50:59662 days ago1712170259346,800 Hop (HOP)
0x625ea0f48e1e6742f6870ec14a935cdaa3464c57087a36e53c0718ced6bc483a2024-03-08 5:42:23688 days ago1709876543346,800 Hop (HOP)
0x95eb37696ce84ffb9f557675764af9dbb137788556bedd7063ea943f5fc9dcf22024-02-11 0:05:49715 days ago1707609949346,800 Hop (HOP)
0x1774a884f0fa5c18ddf53ef22d413dff33c43c58308af3ee0402a20eb6b12fe32024-01-10 16:10:29746 days ago1704903029346,800 Hop (HOP)
0xdeb34c5d47812089f9d8fbe5c53758c1aef6923c200633944913200f33a201452023-12-16 17:32:37771 days ago1702747957346,800 Hop (HOP)
0x8eea4e756e222ed040a709801e08c4f4ac70b7bb743a9a8e9be0d447ef362bd92023-11-17 3:12:59800 days ago1700190779346,800 Hop (HOP)
0xbbd8655fc83a583c76ae2700fb50e02361ace67d17dfbda2ec3dd185928361182023-10-19 19:11:49829 days ago1697742709346,800 Hop (HOP)
0x064897f317f8669b77dda97388c3de05e62be864791a78d74f7f2f383dff80392023-09-19 21:41:43859 days ago1695159703346,800 Hop (HOP)
0x7f0be670cd04e69ebede4f0f745159b043c7c9ff5da6975814ce40996eecabc52023-08-25 0:19:39885 days ago1692922779346,800 Hop (HOP)
0x1f3073c0947cbe36a96056a0bb486ef8bcfb001d819bb1db59c737d16f309f032023-08-01 15:15:41908 days ago1690902941346,800 Hop (HOP)
0xf69190db0773e7d1f4ddbcec83a129d76e5fb4c305627c74f0beb6e378df24612023-07-05 15:54:31935 days ago1688572471346,800 Hop (HOP)
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Contract Source Code Verified (Exact Match)

Contract Name:
StakingRewards

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at optimistic.etherscan.io on 2022-10-18
*/

/**
 *Submitted for verification at polygonscan.com on 2021-10-19
*/

// Sources flattened with hardhat v2.3.3 https://hardhat.org

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

pragma solidity ^0.5.0;

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

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

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


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

pragma solidity ^0.5.0;

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

        return c;
    }

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

        return c;
    }

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

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

        return c;
    }

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

        return c;
    }

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


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

pragma solidity ^0.5.0;

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

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

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

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

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

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

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

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


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

pragma solidity ^0.5.0;

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

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

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

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

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


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

pragma solidity ^0.5.0;

/**
 * @dev Collection of functions related to the address type,
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * This test is non-exhaustive, and there may be false-negatives: during the
     * execution of a contract's constructor, its address will be reported as
     * not containing a contract.
     *
     * > It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

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


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

pragma solidity ^0.5.0;



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

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

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

    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

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

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value);
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves.

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

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


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

pragma solidity ^0.5.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the `nonReentrant` modifier
 * available, which can be aplied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 */
contract ReentrancyGuard {
    /// @dev counter to allow mutex lock with only one SSTORE operation
    uint256 private _guardCounter;

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

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _guardCounter += 1;
        uint256 localCounter = _guardCounter;
        _;
        require(localCounter == _guardCounter, "ReentrancyGuard: reentrant call");
    }
}


// File contracts/interfaces/IStakingRewards.sol

pragma solidity >=0.4.24;


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 contracts/RewardsDistributionRecipient.sol

pragma solidity ^0.5.16;

contract RewardsDistributionRecipient {
    address public rewardsDistribution;

    function notifyRewardAmount(uint256 reward) external;

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

    function setRewardsDistribution(address _rewardsDistribution) external onlyRewardsDistribution {
        rewardsDistribution = _rewardsDistribution;
    }
}


// File contracts/StakingRewards.sol

pragma solidity ^0.5.16;





// Inheritance


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 rewardsDuration = 28 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 _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]);
    }

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

    /* ========== 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) external onlyRewardsDistribution 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);
    }

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

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

Contract Security Audit

Contract ABI

API
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IERC20","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_rewardsDistribution","type":"address"}],"name":"setRewardsDistribution","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":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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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000009f8d2dafe9978268ac7c67966b366d6d55e97f07000000000000000000000000c5102fe9359fd9a28f877a67e36b0f050d81a3cc0000000000000000000000005c2048094baade483d0b1da85c3da6200a88a849

-----Decoded View---------------
Arg [0] : _rewardsDistribution (address): 0x9f8d2dafE9978268aC7c67966B366d6d55e97f07
Arg [1] : _rewardsToken (address): 0xc5102fE9359FD9a28f877a67E36B0F050d81a3CC
Arg [2] : _stakingToken (address): 0x5C2048094bAaDe483D0b1DA85c3Da6200A88a849

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000009f8d2dafe9978268ac7c67966b366d6d55e97f07
Arg [1] : 000000000000000000000000c5102fe9359fd9a28f877a67e36b0f050d81a3cc
Arg [2] : 0000000000000000000000005c2048094baade483d0b1da85c3da6200a88a849


Deployed Bytecode Sourcemap

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Swarm Source

bzzr://2b8cc30ab02d474c2bc60c1b7bd2358c718fca75540914db9942a904b390d6d4

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