Contract 0x5756e4b857f446573d9863f47f0ed9cde23e7a4e

 

Contract Overview

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Txn Hash
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0xd0998708eb486727b07f6ef0a1a249d8578c531e11f4160092328e4d550db65197381672021-08-04 10:00:467 hrs ago0x63e8f6b4bd9238cd8758f894550ce25f6448a1f1 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00026964
0x69186958c34fc5aad6beb41f36187da383896c66717576291b12f5cb26c81b1697372112021-08-04 9:11:557 hrs 48 mins ago0x1f1f98013edf1bf3021f29a87010b3d0d84b7b11 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.000223075
0x58be1571aed4076e47a318b8fd26794f5b3ba9f3db53bd8b120d7cb49a8a0c9997370382021-08-04 9:02:507 hrs 58 mins ago0x01a2c0cc3fc848d1cbfa4198822349c85905785b IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.0002697
0x1cb404c11bcc962a08a54d9a60f1c2bb858e0fcf37ee561c938e91375cde450497370072021-08-04 9:01:177 hrs 59 mins ago0x01a2c0cc3fc848d1cbfa4198822349c85905785b IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.000223075
0x0451e5b6b40ddbf0bf8a00d0bf471abebd3d177651de788f3b776cd990e0988997370032021-08-04 9:01:057 hrs 59 mins ago0x01a2c0cc3fc848d1cbfa4198822349c85905785b IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.000396465
0xd3fca592a41ea7e137b0303acad301cd9243763cba0120ba2454a08de01ee4e797271552021-08-04 0:26:3916 hrs 34 mins ago0x1f790374d52b83864b703250e1e358b1c4373b45 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00026964
0x5f8f012b93d43a1df2f7ed70f9b2065ec1cd6970b3422383cedec2d6da0fc6c497271532021-08-04 0:26:3316 hrs 34 mins ago0x1f790374d52b83864b703250e1e358b1c4373b45 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.000375465
0x6b4e98b4c742e7cbf5b5cb78da31168d1197191343c644e565de049a9c8377a897218812021-08-03 19:57:4221 hrs 3 mins ago0x579c870343d855954328ff0dced56b6890099039 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00037437
0x7e31706a258fb782596b7a1db99cae849c814c8191833993cf9c902444aaad2797127392021-08-03 11:57:201 day 5 hrs ago0x1bc038f6ece8d4f6a6aa83aa94bb27a1cb40381a IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00037431
0x195b6c1a24a8dd00bf8df878f124bdcf847c906f27a87e03effd0a7ce5bbb21097122652021-08-03 11:33:081 day 5 hrs ago0x573c86a2eecb33a7f614823a4c0159cbff84a0d3 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00030396
0xa8d5bb36e9ed3ce04f07be70fbb9812049e6dc30b15aa4f2cc5799a333a2d24897056362021-08-03 5:36:241 day 11 hrs ago0x0f28f80e1de4c001660bbad9e95e256979304a97 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00037896
0xf51fa2ed61192306b76263a0a925994c7adcb7145645ebcbf0a2a419a86ae78297056342021-08-03 5:36:181 day 11 hrs ago0x0f28f80e1de4c001660bbad9e95e256979304a97 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00029943
0x34e77125b6a41d4b1a23b81846a1060ae0f324e58d624f6b7d74e9a971c0d26297022862021-08-03 2:21:251 day 14 hrs ago0x34439778adb37e093d48907d1441aef40d4bb44d IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00030396
0x8dc3081d828867623062d1d90d895a0ea8c8d328b6c7f7c415e5f974516c001d97022352021-08-03 2:18:521 day 14 hrs ago0x34439778adb37e093d48907d1441aef40d4bb44d IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00029937
0x1676527c7219f3c64c3a67aa753f72546cb08a877310f2616118cf22c90b586496989142021-08-02 23:28:511 day 17 hrs ago0x2faa99eaeae83b5091ebf22ec16d383566d01508 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00026964
0x51cd26680252751df143df29a8d596893e2df53aaad8eef7d84010b4e014066096988912021-08-02 23:27:421 day 17 hrs ago0x2faa99eaeae83b5091ebf22ec16d383566d01508 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.000223075
0xb949c1f35957cd78f52761b1375347280627292021f453021647f47b0a9baa2796988702021-08-02 23:26:391 day 17 hrs ago0x2faa99eaeae83b5091ebf22ec16d383566d01508 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00037955
0x5549cc46e25b07adfe629af414c707dd2d329cddee6cc67fd21872acbfe43ad196988612021-08-02 23:26:121 day 17 hrs ago0x2faa99eaeae83b5091ebf22ec16d383566d01508 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.000348745
0x6a390e620b6482ea46bbc88952eb6d87089a4ae348e16c115c88c601f753580e96905982021-08-02 16:24:562 days 35 mins ago0xccb86dfbd2770a788187d0b9bd3b5a4b0a5090e5 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00029937
0x1a83b4d58e36587d4dedb4d0c5b8cd081e554d3af181fa695d0d30430f1855e296817712021-08-02 8:41:252 days 8 hrs ago0xee98bb8614689f3d4f96dd7a0038a98b81441ed2 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.0003447
0x91e5865ee34c8c2358bd512fbe0c10cb72c8eddecf9b699cb1842b22a4df879796817692021-08-02 8:41:192 days 8 hrs ago0xee98bb8614689f3d4f96dd7a0038a98b81441ed2 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.000396465
0x2a5acfe5ad73118b244778e40cb83cb0d03b0d5cb925475f82f6cf0d25bc6f1b96814562021-08-02 8:25:402 days 8 hrs ago0x63e8f6b4bd9238cd8758f894550ce25f6448a1f1 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.000223075
0x5b679d5cfaede92f6cfb33e7c7f3c495eed50e232da22698b6bdf036543c785396772862021-08-02 4:53:362 days 12 hrs ago0xfe32b5f3f39c4e26e1492578e3111d6cbfb1a12a IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00037896
0xc47a9221b2e3180c760b3d5c4bf3a0659ea420f6d10b422c1c17bedfa114b34896772772021-08-02 4:53:082 days 12 hrs ago0xfe32b5f3f39c4e26e1492578e3111d6cbfb1a12a IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.00037437
0x7fa9873dfcf40b2e0002fbc122e878b1c8518a436cf101df02486a1f5b59efe896760412021-08-02 3:49:212 days 13 hrs ago0xfe3a23668bc5d77de82457c575bee3ac2cbdf784 IN  0x5756e4b857f446573d9863f47f0ed9cde23e7a4e0 BNB0.0002697
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Contract Source Code Verified (Exact Match)

Contract Name:
WPool

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2021-05-12
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.7.6;

/*
 * @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;
    }
}

/**
 * @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);
}

/**
 * @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 virtual 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;
    }
}

/**
 * @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);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(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);
            }
        }
    }
}


/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

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

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * 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);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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;
    }
}

/**
 * @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");
        }
    }
}

contract WPool is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    struct UserInfo {
        uint256 amount;
        uint256 rewardDebt;
        uint256 pendingRewards;
    }

    struct PoolInfo {
        IERC20 wex;
        uint256 lastRewardBlock;
        uint256 accTokenPerShare;
    }

    IERC20 public rewardToken;
    uint256 public rewardPerBlock = uint256(1 ether);

    PoolInfo public pool;
    mapping(address => UserInfo) public userInfo;

    event Deposit(address indexed user, uint256 amount);
    event Withdraw(address indexed user, uint256 amount);
    event Claim(address indexed user, uint256 amount);

    function setTokens(IERC20 _rewardToken) external onlyOwner {
        require(address(rewardToken) == address(0) && address(pool.wex) == address(0), 'Tokens already set!');
        rewardToken = _rewardToken;
        IERC20 _wex = IERC20(0xa9c41A46a6B3531d28d5c32F6633dd2fF05dFB90);
        pool =
            PoolInfo({
                wex: _wex,
                lastRewardBlock: 0,
                accTokenPerShare: 0
        });
    }
    
    function startPool(uint256 startBlock) external onlyOwner {
        require(pool.lastRewardBlock == 0, 'Pool already started');
        pool.lastRewardBlock = startBlock;
    }

    function pendingRewards(address _user) external view returns (uint256) {
        require(pool.lastRewardBlock > 0 && block.number >= pool.lastRewardBlock, 'Pool not yet started');
        UserInfo storage user = userInfo[_user];
        uint256 accTokenPerShare = pool.accTokenPerShare;
        uint256 wexSupply = pool.wex.balanceOf(address(this));
        if (block.number > pool.lastRewardBlock && wexSupply != 0) {
            uint256 multiplier = block.number.sub(pool.lastRewardBlock);
            uint256 tokenReward = multiplier.mul(rewardPerBlock);
            accTokenPerShare = pool.accTokenPerShare.add(tokenReward.mul(1e12).div(wexSupply));
        }
        return user.amount.mul(accTokenPerShare).div(1e12).sub(user.rewardDebt).add(user.pendingRewards);
    }

    function updatePool() internal {
        require(pool.lastRewardBlock > 0 && block.number >= pool.lastRewardBlock, 'Pool not yet started');
        if (block.number <= pool.lastRewardBlock) {
            return;
        }
        uint256 wexSupply = pool.wex.balanceOf(address(this));
        if (wexSupply == 0) {
            pool.lastRewardBlock = block.number;
            return;
        }
        uint256 multiplier = block.number.sub(pool.lastRewardBlock);
        uint256 tokenReward = multiplier.mul(rewardPerBlock);
        pool.accTokenPerShare = pool.accTokenPerShare.add(tokenReward.mul(1e12).div(wexSupply));
        pool.lastRewardBlock = block.number;
    }

    function deposit(uint256 amount) external {
        UserInfo storage user = userInfo[msg.sender];
        updatePool();
        if (user.amount > 0) {
            uint256 pending = user.amount.mul(pool.accTokenPerShare).div(1e12).sub(user.rewardDebt);
            if (pending > 0) {
                user.pendingRewards = user.pendingRewards.add(pending);
            }
        }
        if (amount > 0) {
            pool.wex.safeTransferFrom(address(msg.sender), address(this), amount);
            user.amount = user.amount.add(amount);
        }
        user.rewardDebt = user.amount.mul(pool.accTokenPerShare).div(1e12);
        emit Deposit(msg.sender, amount);
    }

    function withdraw(uint256 amount) external {
        UserInfo storage user = userInfo[msg.sender];
        require(user.amount >= amount, "Withdrawing more than you have!");
        updatePool();
        uint256 pending = user.amount.mul(pool.accTokenPerShare).div(1e12).sub(user.rewardDebt);
        if (pending > 0) {
            user.pendingRewards = user.pendingRewards.add(pending);
        }
        if (amount > 0) {
            user.amount = user.amount.sub(amount);
            pool.wex.safeTransfer(address(msg.sender), amount);
        }
        user.rewardDebt = user.amount.mul(pool.accTokenPerShare).div(1e12);
        emit Withdraw(msg.sender, amount);
    }

    function claim() external {
        UserInfo storage user = userInfo[msg.sender];
        updatePool();
        uint256 pending = user.amount.mul(pool.accTokenPerShare).div(1e12).sub(user.rewardDebt);
        if (pending > 0 || user.pendingRewards > 0) {
            user.pendingRewards = user.pendingRewards.add(pending);
            uint256 claimedAmount = safeTokenTransfer(msg.sender, user.pendingRewards);
            emit Claim(msg.sender, claimedAmount);
            user.pendingRewards = user.pendingRewards.sub(claimedAmount);
        }
        user.rewardDebt = user.amount.mul(pool.accTokenPerShare).div(1e12);
    }

    function safeTokenTransfer(address to, uint256 amount) internal returns (uint256) {
        uint256 tokenBalance = rewardToken.balanceOf(address(this));
        if (amount > tokenBalance) {
            rewardToken.safeTransfer(to, tokenBalance);
            return tokenBalance;
        } else {
            rewardToken.safeTransfer(to, amount);
            return amount;
        }
    }
    
    function setRewardPerBlock(uint256 _rewardPerBlock) external onlyOwner {
        require(_rewardPerBlock > 0, "Reward per block should be greater than 0!");
        rewardPerBlock = _rewardPerBlock;
    }
}

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Claim","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"claim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"pendingRewards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pool","outputs":[{"internalType":"contract IERC20","name":"wex","type":"address"},{"internalType":"uint256","name":"lastRewardBlock","type":"uint256"},{"internalType":"uint256","name":"accTokenPerShare","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rewardPerBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_rewardPerBlock","type":"uint256"}],"name":"setRewardPerBlock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"_rewardToken","type":"address"}],"name":"setTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"startBlock","type":"uint256"}],"name":"startPool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userInfo","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"rewardDebt","type":"uint256"},{"internalType":"uint256","name":"pendingRewards","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://72f146316463ddb3ad7a076ac2acf698405e4352a6eca51913c472591931d1fa
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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