Contract 0x126332e41655E313205e962Cd0cB8041b2BDae2a

 
Txn Hash
Method
Block
From
To
Value
0xa6291f6442716034e37c54ab378f086e26b8ceec5923a3c51f5257478d3b5eb4Unstake146225142022-04-20 14:43:18160 days 6 hrs ago0x51016587d72a54c17ba1404eb400571c222144e7 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00635845 62.55300953
0x1e8c563c2876344cacff9339fe3ad89a948328122258c8d75cb2b6eb87f17d2dUnstake146220112022-04-20 12:52:50160 days 8 hrs ago0x7356ece4705bfbd926bc787ccc758fd9406283c0 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00391815 38.5458931
0xc7856a95e97f185d283e1eb0ee0fcf7d068b69b9710c555aef21ae6bf50cdd1cUnstake144264112022-03-21 0:07:47190 days 21 hrs ago0xa216208dab8aeba66080129db856f4a84f0f809a IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00225843 26.7115517
0x7ecfeb3c50a388e77a79b5276b6921d6ad72f4fdcd95525c332051442de87a45Unstake144226082022-03-20 10:03:50191 days 11 hrs ago0xe141bc0ee323730c5d1170755f2a804a7dba1e61 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.0015701 15.44636708
0x786bd397e8b67d730fddef16bf666fbd739302edd637cbff2ac6bdd6e3771974Unstake143627872022-03-11 2:07:17200 days 19 hrs ago0x464a215862c89ee45278a9426069f2b16e08eba8 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00318445 31.32797907
0xcfee8cf0f28e7c88d9dbabd9c948780ae37a1098407bae09a2f42145463cf61eUnstake143321702022-03-06 8:05:09205 days 13 hrs ago0xae6e14c8d748f97f44a58bfaf373c7e480f96317 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00195643 19.24698855
0xa7e0cb3a4fdbc2119b0ca7360ca2063c79dc1818f929d0a75c7b3758549ea681Unstake143044752022-03-02 0:44:53209 days 20 hrs ago0x95ed4ab614cb893510266eeb9afc5ababecc510a IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00341038 33.55059502
0x4b7842ea4a047a6f6278add6958b22f1428a2ae5d3f2a080fc19e97a279de266Unstake143031412022-03-01 19:58:26210 days 1 hr ago0x4aaf2a4e0ac210098c652d2909f9cdae5ae1787f IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00468078 46.04850544
0xfff63263d7f8a07a98f82eb3289b5af12c687a66efaa77e75563805e09d71c9dUnstake143028932022-03-01 19:05:19210 days 2 hrs ago0xddd0a8b1709103d8352e2dc265b0803fd78880f5 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.01601111 157.51374988
0x80736244e1907d2478cc352e483dcd851f7563b4c107dc0c6bc52c6c0b4a5289Withdraw121538272021-04-01 13:21:26544 days 7 hrs agoDePay: Deployer IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00977252175
0xd11d92bfff5f8e6a85b2291198f3bb7c0796d73de764e9cf6a20efeb35d99e4cStake121497152021-03-31 21:57:40544 days 23 hrs ago0xe141bc0ee323730c5d1170755f2a804a7dba1e61 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.01744137217.00000145
0x3c3f5e679b03a4e3470597ec648bb2df9beff1e0f404f146f929c4f7f400a727Stake121484232021-03-31 17:15:59545 days 3 hrs ago0x51016587d72a54c17ba1404eb400571c222144e7 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.02628654327
0xf2dd6e9373058a866a43e9f18069014c303a406d6109fe85f6ed6ac3bf25a5f0Stake121466782021-03-31 10:57:33545 days 10 hrs ago0x7356ece4705bfbd926bc787ccc758fd9406283c0 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.01141325142.00000145
0x10fff9d2d30cada8a3d1ff00c3339379e489809e0a6edf452abb4ecc55dd34d4Stake121448722021-03-31 4:05:59545 days 17 hrs ago0x464a215862c89ee45278a9426069f2b16e08eba8 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.012217152
0x460be54609f582bd09353ccc2bc735f1832af757ead21fe38a51289c9f0c8ab1Stake121395162021-03-30 8:22:17546 days 12 hrs ago0x9eb7399cafcd019d13ed6e951b1b7cc4aeba8fa2 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.01103548137.3
0x66340e1ff4a13da336fefe1d11741b6ca40cba7afd1185c0e786af9024d5e2fbStake121376182021-03-30 1:14:28546 days 20 hrs ago0xdf26b1090ee061fff9e5b8a94e5705c90612906b IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00916275114.00000145
0x3baf13812c374648e57a45661fd6f7639aebd835d6660860cc69045d3489c84aStake121370382021-03-29 23:13:11546 days 22 hrs ago0xd3ea93b78fb9218b43da2113c0b84fe07b34bd9f IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00940387117
0x05f066882046b91fa707b0209e9b6da41a80e101053883c5f7186f4f7dd9941dStake120412612021-03-15 5:25:25561 days 15 hrs ago0x63fcf5f6e291614d2c296e443eac9d41ddbed1b9 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00972682121.00000145
0xff465944f20fb2d7e5ef484b0949108a7ce7447f68d995149eecd2bf65e0816bStake120404112021-03-15 2:09:24561 days 19 hrs ago0xae6e14c8d748f97f44a58bfaf373c7e480f96317 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.01045031130.00000156
0x2769dda019880cf4d31709e7433cfee8c9e554d05ed6b2fdb3211c2b2a331fd3Stake120336292021-03-14 1:06:31562 days 20 hrs ago0xb68fe33bd9207a41e399830748a98a03da42b94d IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00561098127
0x9f938efc1b2ca5dfbeb2a98f0a0f53e1d0aefff3a77f8c24062328fbd3213e31Stake120335702021-03-14 0:53:58562 days 20 hrs ago0xb68fe33bd9207a41e399830748a98a03da42b94d IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00980721122
0xfd57582a1066e7bbbd19910b7788b96646ead63ceca0f88d9cd72a3b0ff61ee6Stake120280492021-03-13 4:39:14563 days 16 hrs ago0xddd0a8b1709103d8352e2dc265b0803fd78880f5 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.00996798124
0xc99c3e54772fae5e0a4ca82916c2fa40b0e7e3acb0897002516deb378f6d0029Stake120270562021-03-13 0:52:30563 days 20 hrs ago0xd2f42f2afaa7d9e12c360444f840383810badf21 IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.01454787181
0x9b23f6839f9fe59e5eff898c8b3bdf9eb88a42b686569c261f0491dd43d79f6bStake120078632021-03-10 1:43:25566 days 19 hrs ago0x95ed4ab614cb893510266eeb9afc5ababecc510a IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.01012725126
0x7c5dc1cbad873b3bcaad6fce34f6c0ae03d9cb036c783c1791f31cc02bc0a398Stake120023432021-03-09 5:10:07567 days 16 hrs ago0x4aaf2a4e0ac210098c652d2909f9cdae5ae1787f IN  0x126332e41655e313205e962cd0cb8041b2bdae2a0 Ether0.01016895126.5
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x98eaa281b5606a19c7f7ef966d5fb687bca360f4

Contract Name:
DePayLiquidityStaking

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-02-03
*/

// 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

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"allocatedStakingRewards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"closeTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"destroy","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"enableUnstakeEarly","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_startTime","type":"uint256"},{"internalType":"uint256","name":"_closeTime","type":"uint256"},{"internalType":"uint256","name":"_releaseTime","type":"uint256"},{"internalType":"uint256","name":"_percentageYield","type":"uint256"},{"internalType":"address","name":"_liquidityToken","type":"address"},{"internalType":"address","name":"_token","type":"address"}],"name":"init","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"liquidityToken","outputs":[{"internalType":"contract IUniswapV2Pair","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"liquidityTokenTotalSupplyOnInit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"percentageYield","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"releaseTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rewardsAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"rewardsPerAddress","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"stakedLiquidityTokenAmount","type":"uint256"}],"name":"stake","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"stakedLiquidityTokenPerAddress","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenReserveOnInit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unstake","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unstakeEarly","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unstakeEarlyAllowed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://dca4aa8098165031c46dd4b5104c3de766e586b500a67efb7ed51a034673f6bc
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.