Contract 0x21a029a338005f0a8F3A2F4a0CFb7D7f91b56e65 1

 
Txn Hash
Method
Block
From
To
Value
0xcf9bf23d084324938db40a17476d4779f459c3d60a916110a227551bbef59a25Unstake149130212022-06-06 4:37:25113 days 16 hrs ago0x2984670e980223f07cd3d0e2fa24fb3089a119b7 IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.00174857 30.43702561
0xbdafeb43c67ae27f0b6ae294129a65804d3c7ed658d9295debf481acb680ddb7Unstake149130212022-06-06 4:37:25113 days 16 hrs ago0x2984670e980223f07cd3d0e2fa24fb3089a119b7 IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.00301448 29.65581719
0xa61e36248a0fb8409c33101ef175a2eb65d1e288d66af5ca681f980324ded62cWithdraw144410362022-03-23 6:43:42188 days 14 hrs agoDePay: Deployer IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.00176462 32.35284514
0x7355c12bf4759eb5cee417796daebbab06117996491f7b286d4e45b8adb4ea90Unstake141386902022-02-04 9:26:58235 days 11 hrs ago0xe8619b86f54e1449202b9975c162684b8f073028 IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.0051454 60.85710624
0xfbf843d20eb845407542d391c4943dfedaa268f5550fd826935fda3a27387c08Unstake139378742022-01-04 8:18:48266 days 13 hrs ago0x317d875ca3b9f8d14f960486c0d1d1913be74e90 IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.00902146 88.75117235
0xef73f70d3f38bb8ff69dd9f570c17e0d56d9050b36c0af96a18ca68633a558e6Unstake139245522022-01-02 6:56:46268 days 14 hrs ago0x70cbe5945215803d1a185225ff18e173b3ee43b9 IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.00653158 64.25625024
0x56cf92dc23a059d3e3c8739da51162e695ecbfd8aff3616e92db73adc205fafaUnstake139193412022-01-01 11:39:36269 days 9 hrs ago0x94ead7eba81a2bd2201ce6f48581f6ad11fc3e4c IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.00437635 43.05362953
0xaa1c35be2cf8f0ba7123be3fa61a8238b85f8214584b96d49143ad6bde7e3d53Unstake139186482022-01-01 9:13:36269 days 12 hrs ago0x44234ece5a316e5dccc272850f3e88023bd7a07d IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.00651366 64.07993963
0x0f342278adb235a99a1cd4bd722b70a052beb2c30ea07c372566ffcbc7be4296Unstake139163602022-01-01 0:38:38269 days 20 hrs agoENS Name sakuraji.eth IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.00705447 83.43649598
0x75d1531998034b7854ad42c7c94e33179413341fc2b93126c0832148061b809fWithdraw117840252021-02-03 15:08:28601 days 6 hrs agoDePay: Deployer IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.00921409165
0xab2aed2a67907ede9bb2739bc5467335d1dd51b3e8ef639eac920db65830d5a1Stake117553462021-01-30 5:15:39605 days 16 hrs agoENS Name sakuraji.eth IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.0041801252
0xc17ea9511e0b9cd41ca474971d33118d2dc445fff8afffe844d50776c66541f3Stake117227512021-01-25 4:48:04610 days 16 hrs ago0x70cbe5945215803d1a185225ff18e173b3ee43b9 IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.0050636263
0x6e32da66922e953e46c4806903fdacf8b8d53b67528e4ccdef25f313b5347947Stake117112172021-01-23 10:17:09612 days 11 hrs ago0x6e6f8cbc654ec631400c500bdc50fb9f5de43abf IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.0055458769
0xc1d0df121737f7a9746b3526782c38558ce62f3bfb577a031af71624ce47c254Stake117061452021-01-22 15:36:01613 days 5 hrs ago0x0ea77a3de93240f36f1347b7e8babb495384a0c1 IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.0080375100
0x2fe49bea9582daaf0e5e412cb12e55b3c34a96a1bffade28491ad1dd9ff8c80dStake117043452021-01-22 8:59:11613 days 12 hrs ago0x94ead7eba81a2bd2201ce6f48581f6ad11fc3e4c IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.00868179108
0x1aaea4b9e1a6be989d2e2cb6b80be612bd3f860af5af94109af8be9987ddf8deStake116853092021-01-19 10:54:12616 days 10 hrs ago0xe8619b86f54e1449202b9975c162684b8f073028 IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.00514464
0x31370cf03900626358cdc97b3faea59fd921de683c281d6dd8867f465b454cd2Stake116443212021-01-13 3:50:59622 days 17 hrs ago0x44234ece5a316e5dccc272850f3e88023bd7a07d IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.00450156
0x48ede41087223ffc339a6c80a7931ea871736414e9f3cb15802dc78f894e3bd8Stake116290742021-01-10 19:40:56625 days 1 hr ago0x2984670e980223f07cd3d0e2fa24fb3089a119b7 IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.0044206255
0x50c973474930be9c99df56ffbe4e2d18c57cc784baaf1fa0d89f30010713f084Stake116121892021-01-08 5:44:14627 days 15 hrs ago0x2fe7d879e342fee5f1d04bfedaf35bb9d4fa5b89 IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.0057878672
0x613d2e79721255123b10e38eb424d7dd884cabb97e4776afddefe8c1cc4cae2dStake115842072021-01-03 22:24:56631 days 22 hrs ago0x7ce6a0709465fea758b7ff1de924fab9e5b65229 IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.01237959154.00000123
0x1926b2b7df1f794c6c5594a78c58226a926a1e97dc2b2849cb1c542fcbdbbda4Stake115837742021-01-03 20:41:17632 days 37 mins ago0x317d875ca3b9f8d14f960486c0d1d1913be74e90 IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.01302425118
0xfa9e1aef69b6b599e8b2977c20be655201585ff672789af5e26d8b91fed928a2Init115836912021-01-03 20:23:32632 days 55 mins agoDePay: Deployer IN  0x21a029a338005f0a8f3a2f4a0cfb7d7f91b56e650 Ether0.027352123
0xf2782665770b9e60e1fdee5e501c40c2dbdfb151919fbe2507fca5a0e4ecf65d0x60806040114581972020-12-15 14:28:48651 days 6 hrs agoDePay: Deployer IN  Contract Creation0 Ether0.16427471105.055
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xc4d073749a3eb7726c4d0ecaa59bf5b6cd37d2b6

Contract Name:
DePayLiquidityStaking

Compiler Version
v0.7.5+commit.eb77ed08

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-12-14
*/

// Dependency file: contracts/interfaces/IUniswapV2Pair.sol

// SPDX-License-Identifier: MIT

// pragma solidity >=0.7.5 <0.8.0;

interface IUniswapV2Pair {
    
    function totalSupply() external view returns (uint);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
    function token0() external view returns (address);

}


// Dependency file: @openzeppelin/contracts/token/ERC20/IERC20.sol


// pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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.
     *
     * // importANT: 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);
}


// Dependency file: @openzeppelin/contracts/math/SafeMath.sol


// pragma solidity >=0.6.0 <0.8.0;

/**
 * @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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        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-contracts/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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}


// Dependency file: @openzeppelin/contracts/utils/Address.sol


// pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [// importANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on 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;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * // importANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


// Dependency file: @openzeppelin/contracts/token/ERC20/SafeERC20.sol


// pragma solidity >=0.6.0 <0.8.0;

// import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import "@openzeppelin/contracts/math/SafeMath.sol";
// import "@openzeppelin/contracts/utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` 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));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    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, "SafeERC20: decreased allowance below zero");
        _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. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "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");
        }
    }
}


// Dependency file: @openzeppelin/contracts/utils/ReentrancyGuard.sol


// pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied 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.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}


// Dependency file: @openzeppelin/contracts/GSN/Context.sol


// pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}


// Dependency file: @openzeppelin/contracts/access/Ownable.sol


// pragma solidity >=0.6.0 <0.8.0;

// import "@openzeppelin/contracts/GSN/Context.sol";
/**
 * @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.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

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

    /**
     * @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(_owner == _msgSender(), "Ownable: caller is not the 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 virtual 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 virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}


// Root file: contracts/DePayLiquidityStaking.sol


pragma solidity >=0.7.5 <0.8.0;

// import 'contracts/interfaces/IUniswapV2Pair.sol';

// import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
// import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
// import "@openzeppelin/contracts/access/Ownable.sol";
// import "@openzeppelin/contracts/math/SafeMath.sol";

contract DePayLiquidityStaking is Ownable, ReentrancyGuard {
  
  using SafeMath for uint256;
  using SafeERC20 for IERC20;

  // Epoch time when staking starts: People are allowed to stake
  uint256 public startTime;

  // Epoch time when staking has been closed: People are not allowed to stake anymore
  uint256 public closeTime;

  // Epoch time when staking releases staked liquidity + rewards: People can withdrawal
  uint256 public releaseTime;

  // Total amount of staking rewards available
  uint256 public rewardsAmount;

  // Percentage Yield, will be divided by 100, e.g. set 80 for 80%
  uint256 public percentageYield;

  // Total amount of already allocated staking rewards
  uint256 public allocatedStakingRewards;

  // Address of the Uniswap liquidity pair (token)
  IUniswapV2Pair public liquidityToken;

  // Address of the token used for rewards
  IERC20 public token;

  // Indicating if unstaking early is allowed or not
  // This is used to upgrade liquidity to uniswap v3
  bool public unstakeEarlyAllowed;

  // Stores all rewards per address
  mapping (address => uint256) public rewardsPerAddress;

  // Stores all amounts of staked liquidity tokens per address
  mapping (address => uint256) public stakedLiquidityTokenPerAddress;

  // Token Reserve On initialization, used to calculate rewards upon staking
  uint256 public tokenReserveOnInit;
  
  // Liquidity Token Total Supply on initialization, used to calculate rewards upon staking
  uint256 public liquidityTokenTotalSupplyOnInit;

  modifier onlyUnstarted() {
    require(
      startTime == 0 || block.timestamp < startTime,
      "Staking has already started!"
    );
    _;
  }

  modifier onlyStarted() {
    require(block.timestamp > startTime, "Staking has not yet started!");
    _;
  }

  modifier onlyUnclosed() {
    require(block.timestamp < closeTime, "Staking has been closed!");
    _;
  }

  modifier onlyReleasable() {
    require(block.timestamp > releaseTime, "Staking is not releasable yet!");
    _;
  }
  
  modifier onlyUnstakeEarly() {
    require(unstakeEarlyAllowed, "Unstaking early not allowed!");
    _;
  }

  modifier onlyDistributedRewards(){
    require(allocatedStakingRewards == 0, 'Rewards were not distributed yet!');
    _;
  }

  function init(
      uint256 _startTime,
      uint256 _closeTime,
      uint256 _releaseTime,
      uint256 _percentageYield,
      address _liquidityToken,
      address _token
  ) external onlyOwner onlyUnstarted returns(bool) {
    require(isContract(_token), '_token address needs to be a contract!');
    require(isContract(_liquidityToken), '_liquidityToken address needs to be a contract!');
    require(_startTime < _closeTime && _closeTime < _releaseTime, '_startTime needs to be before _closeTime needs to be before _releaseTime!');
    
    startTime = _startTime;
    closeTime = _closeTime;
    releaseTime = _releaseTime;
    percentageYield = _percentageYield;
    liquidityToken = IUniswapV2Pair(_liquidityToken);
    token = IERC20(_token);
    rewardsAmount = token.balanceOf(address(this));

    require(liquidityToken.token0() == address(token), 'Rewards must be calculated based on the reward token address!');
    (tokenReserveOnInit,,) = liquidityToken.getReserves();
    liquidityTokenTotalSupplyOnInit = liquidityToken.totalSupply();

    return true;
  }

  function stake(
    uint256 stakedLiquidityTokenAmount
  ) external onlyStarted onlyUnclosed nonReentrant returns(bool) {
    require(
      liquidityToken.transferFrom(msg.sender, address(this), stakedLiquidityTokenAmount),
      'Depositing liquidity token failed!'
    );

    uint256 rewards = stakedLiquidityTokenAmount
      .mul(tokenReserveOnInit)
      .div(liquidityTokenTotalSupplyOnInit)
      .mul(percentageYield)
      .div(100);

    rewardsPerAddress[msg.sender] = rewardsPerAddress[msg.sender].add(rewards);
    stakedLiquidityTokenPerAddress[msg.sender] = stakedLiquidityTokenPerAddress[msg.sender].add(stakedLiquidityTokenAmount);

    allocatedStakingRewards = allocatedStakingRewards.add(rewards);
    require(allocatedStakingRewards <= rewardsAmount, 'Staking overflows rewards!');

    return true;
  }

  function payableOwner() view private returns(address payable) {
    return payable(owner());
  }
    
  function withdraw(
    address tokenAddress,
    uint amount
  ) external onlyOwner nonReentrant returns(bool) {
    require(tokenAddress != address(liquidityToken), 'Not allowed to withdrawal liquidity tokens!');
    
    if(tokenAddress == address(token)) {
      require(
        allocatedStakingRewards <= token.balanceOf(address(this)).sub(amount),
        'Only unallocated staking rewards are allowed to be withdrawn for roll-over to next staking contract!'
      );
      rewardsAmount = rewardsAmount.sub(amount);
    }

    IERC20(tokenAddress).safeTransfer(payableOwner(), amount);
    return true;
  }

  function _unstakeLiquidity() private {
    uint256 liquidityTokenAmount = stakedLiquidityTokenPerAddress[msg.sender];
    stakedLiquidityTokenPerAddress[msg.sender] = 0;
    require(
      liquidityToken.transfer(msg.sender, liquidityTokenAmount),
      'Unstaking liquidity token failed!'
    );
  }

  function _unstakeRewards() private {
    uint256 rewards = rewardsPerAddress[msg.sender];
    allocatedStakingRewards = allocatedStakingRewards.sub(rewards);
    rewardsPerAddress[msg.sender] = 0;
    require(
      token.transfer(msg.sender, rewards),
      'Unstaking rewards failed!'
    );
  }

  function unstake() external onlyReleasable nonReentrant returns(bool) {
    _unstakeLiquidity();
    _unstakeRewards();
    return true;
  }

  function enableUnstakeEarly() external onlyOwner returns(bool) {
    unstakeEarlyAllowed = true;
    return true;
  }

  function unstakeEarly() external onlyUnstakeEarly nonReentrant returns(bool) {
    _unstakeLiquidity();
    allocatedStakingRewards = allocatedStakingRewards.sub(rewardsPerAddress[msg.sender]);
    rewardsPerAddress[msg.sender] = 0;
    return true;
  }

  function isContract(address account) internal view returns(bool) {
    // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
    // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
    // for accounts without code, i.e. `keccak256('')`
    bytes32 codehash;
    bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
    // solhint-disable-next-line no-inline-assembly
    assembly { codehash := extcodehash(account) }
    return (codehash != accountHash && codehash != 0x0);
  }

  function destroy() public onlyOwner onlyDistributedRewards returns(bool) {
    selfdestruct(payable(owner()));
    return true;
  }
}

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://323aa9b093f757c3b5ccd196859b734fd5de0c94a8e39b81e88ef5ad210bb7ce
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.