Contract 0x0305c18771cD11B36DcfA610BcC8837F814746F1 1

 
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Txn Hash Method
Block
From
To
Value
0x32e4182a59d1daf3655a50f325233df1112bb51d6da138be0dcceb3b9a7853d9Hez To Matic132568352021-09-19 15:04:561 hr 42 mins ago0xf590fc2b65e96705a3d54b8e53a5a2b9ca49e138 IN  Polygon (Matic): HEZ to MATIC0 Ether0.004320141142 51.486028225
0x899472526e81e75f7d705d66d0d0e2dd63050335f96e74a9c38805cd8647b503Hez To Matic132563802021-09-19 13:24:183 hrs 22 mins ago0xceacc735c67217101abd0ffb46661c42dec366a8 IN  Polygon (Matic): HEZ to MATIC0 Ether0.002870500173 34.209681599
0x678203920f46e82ec2547a10f68f6dbdcb4c0b88fbb2fed41a4acb40798fc0a3Hez To Matic132514192021-09-18 18:54:0321 hrs 53 mins ago0x1b9467bb5c60cf643c449a137811904cba730559 IN  Polygon (Matic): HEZ to MATIC0 Ether0.00360529402 42.976445592
0x940747ec88ca60e13132eb8e149bd96cf9623fa430109c27da17ab736754e67eHez To Matic132479512021-09-18 6:02:161 day 10 hrs ago0xa943d7d5460bf6ea00994d8c18fc8690e591b99d IN  Polygon (Matic): HEZ to MATIC0 Ether0.00414594257 49.409986662
0xcbc9a15db066ed0684aa0b12d7cf7aeed16ca1125c673651e9684e75437e80b3Hez To Matic132398752021-09-16 23:54:192 days 16 hrs ago0x04568c5fc7dd4517396298ddf137472b629bb446 IN  Polygon (Matic): HEZ to MATIC0 Ether0.004676199625 55.729416695
0xb0fef9ca2e32cca1bb7be4993560c1cc5e1975c449dc7e29cf0310937d1f12a8Hez To Matic132365782021-09-16 11:48:023 days 4 hrs ago0x499eb561220eb358ccbc5a72d4cdd4f5b76a2d2a IN  Polygon (Matic): HEZ to MATIC0 Ether0.003370458448 40.172329544
0x95f25ba52da63a9ce40e81ae1d9793e606bc68b6dcc8a01da003a4339e19c81dHez To Matic132296792021-09-15 10:09:134 days 6 hrs ago0x03b330cb0f995f04b21ce9c327d02358d6c5dcee IN  Polygon (Matic): HEZ to MATIC0 Ether0.003769993745 44.929551609
0xbd474f770d082985f7721e2d37e17bb72ad1eabf1771c3065af4723503d248ebHez To Matic132274172021-09-15 1:39:274 days 15 hrs ago0x81b1c4d38b47586c50b13857aee3876decb1079b IN  Polygon (Matic): HEZ to MATIC0 Ether0.004608955577 54.928024145
0xc247bc178a9c23febedf7e45e4920b6edcdc4e943938c8190e7ed771ccfe9acaHez To Matic132239962021-09-14 12:57:545 days 3 hrs ago0xc17695fd8943983962d486d5d4cae9a26defeacb IN  Polygon (Matic): HEZ to MATIC0 Ether0.00462441777 65.865514461
0x1ef7b043923e7489bd24cc6180e6978d95c29d9fa0a9927d70090d4083a41150Hez To Matic132223682021-09-14 7:02:595 days 9 hrs ago0x1592f19216ef483ccd36434f64130a194142fd1f IN  Polygon (Matic): HEZ to MATIC0 Ether0.00335640
0x0d902bece8ca761bd4249e46c5ed0456680117f46e6270c5b793c0de4dd7f33fHez To Matic132222002021-09-14 6:29:075 days 10 hrs agoENS Name isidoros.eth IN  Polygon (Matic): HEZ to MATIC0 Ether0.003032946431 36.153849461
0x562ad52e46d2da8f80d688e0326347fd59edb5cb9d5ceff8ad8d3fe4e4d23142Hez To Matic132167682021-09-13 10:16:446 days 6 hrs agoENS Name pluch.eth IN  Polygon (Matic): HEZ to MATIC0 Ether0.004757596036 56.712314176
0x24226df8d3e07b6a77012a57e798157b4641d2700b8dd07984bb81697a41b55bHez To Matic132135062021-09-12 21:55:526 days 18 hrs ago0xf67ae57b77ba1e088117634c90254c797eaafb49 IN  Polygon (Matic): HEZ to MATIC0 Ether0.004194550
0x325b374f49d19728c43d67ac2c2a0c3d9611155f5fb846b6aa1afd050d0e43e8Hez To Matic132118282021-09-12 15:42:437 days 1 hr ago0x3c44151439965c709f7d79ceebaeda5bc5fba9ca IN  Polygon (Matic): HEZ to MATIC0 Ether0.006201671696 73.90949358
0xfe9a4441c74ec5cd486859e9c2274fe5561dac1baa4166f92c2c0d736d6a47bbHez To Matic132115642021-09-12 14:44:057 days 2 hrs ago0x2721ee4d44f2aeeeee8c94130c458276b8268565 IN  Polygon (Matic): HEZ to MATIC0 Ether0.005852292059 69.761497909
0x6aeb43de4590c19ccac63783c0e876f799eb76060abd4d87900dfb180ba0f6b2Hez To Matic132103962021-09-12 10:27:287 days 6 hrs ago0xf80e67169b201fde8436f708025055b2ccc8f780 IN  Polygon (Matic): HEZ to MATIC0 Ether0.004340789118 51.737653379
0x544fc252cfe13dc7e50cfb6e5a92ac6e8573acf8e7fb5e0fa6cfb375ddc94eaaHez To Matic132102002021-09-12 9:43:397 days 7 hrs ago0x34d71d28b1cdf34367b3c69834275389e030d7df IN  Polygon (Matic): HEZ to MATIC0 Ether0.00393858589546.938777664
0xf1c8abad8538821070955dc1edfa221f73844202541c4ff35a1a28d5fc52d037Hez To Matic132100762021-09-12 9:16:357 days 7 hrs agoENS Name zhanglu.eth IN  Polygon (Matic): HEZ to MATIC0 Ether0.006555148708 78.122116913
0x4bceb7d692cf32aa746f4485e345fbb86e6fc9f65fb2b5b232b4e7b1194f3f77Hez To Matic132098062021-09-12 8:13:467 days 8 hrs ago0x0cddfea15e21fc2659c1facc096572bbef29253f IN  Polygon (Matic): HEZ to MATIC0 Ether0.003724930876 44.392507078
0xb5925b16a699e6819f6976d3fc694633d2f292de3d02356ad1df111cca4237ddHez To Matic132098012021-09-12 8:13:127 days 8 hrs ago0x0cddfea15e21fc2659c1facc096572bbef29253f IN  Polygon (Matic): HEZ to MATIC0 Ether0.001370793258 47.304619306
0x5f8d7c95e49e76975abf23cea183d455f5e08b6a2ec42f740dff6f8e7db4faa5Hez To Matic132089552021-09-12 5:06:447 days 11 hrs ago0xe2f35b376461e7fdd2f2e45248e4c3cd9626a933 IN  Polygon (Matic): HEZ to MATIC0 Ether0.003730292239 44.46117091
0x137a8b93fdb615c3429f33dc597d3191a6f9cebc000fedbe3ee559d3b6521134Hez To Matic132065422021-09-11 20:13:437 days 20 hrs ago0x668ad98b2e9e20ac810af5757b341051d4aa57cb IN  Polygon (Matic): HEZ to MATIC0 Ether0.00549144928 65.452315622
0x6359b2454294001333b2e454e179d03276ff9b61ecc6eea91c671efc4c7ca83aHez To Matic132059342021-09-11 17:55:347 days 22 hrs agoENS Name *i-van-kaz.eth IN  Polygon (Matic): HEZ to MATIC0 Ether0.00391561185 46.664980517
0xf43e54ee396cc12a26d50dc9649e9568cebbb11f6acd4c7bd5c26c1586e607aeHez To Matic132048532021-09-11 14:00:328 days 2 hrs agoENS Name 5021314.eth IN  Polygon (Matic): HEZ to MATIC0 Ether0.004964190552 59.167944608
0x29e347d18c9aa9d105e6114e44d47ddbf6645487e5c241b2bf16ec19f0d4b542Hez To Matic132045112021-09-11 12:44:458 days 4 hrs ago0xcfface54cd05eeb2c99600f8b9359fe7f99f7d0e IN  Polygon (Matic): HEZ to MATIC0 Ether0.003885957913 46.316542478
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Contract Source Code Verified (Exact Match)

Contract Name:
HezMaticMerge

Compiler Version
v0.8.6+commit.11564f7e

Optimization Enabled:
Yes with 999999 runs

Other Settings:
default evmVersion
File 1 of 9 : HezMaticMerge.sol
// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.6;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";

contract HezMaticMerge is Ownable {
    using SafeERC20 for IERC20; 

    // bytes4(keccak256(bytes("permit(address,address,uint256,uint256,uint8,bytes32,bytes32)")));
    bytes4 constant _PERMIT_SIGNATURE = 0xd505accf;
    
    // Swap ratio from HEZ to MATIC multiplied by 1000
    uint256 public constant SWAP_RATIO = 3500;

    // HEZ token address
    IERC20 public immutable hez;

    // MATIC token address
    IERC20 public immutable matic;
    
    // UNIX time in seconds when the owner will be able to withdraw the remaining MATIC tokens
    uint256 public withdrawTimeout;

    /**
     * @dev Emitted when someone swap HEZ for MATIC
     */
    event HezToMatic(uint256 hezAmount, uint256 maticAmount, address indexed grantee);

    /**
     * @dev Emitted when the owner increases the timeout
     */
    event NewWithdrawTimeout(uint256 newWithdrawTimeout);

    /**
     * @dev Emitted when the owner withdraw tokens
     */
    event WithdrawTokens(address tokenAddress, uint256 amount);

    /**
     * @dev This contract will receive MATIC tokens, the users will be able to swap their HEZ tokens for MATIC tokens
     *      as long as this contract holds enough amount. The swapped HEZ tokens will be burned.
     *      Once the withdrawTimeout is reached, the owner will be able to withdraw the remaining MATIC tokens.
     * @param _hez HEZ token address
     * @param _matic MATIC token address
     * @param duration Time in seconds that the owner will not be able to withdraw the MATIC tokens
     */
    constructor (
        IERC20 _hez,
        IERC20 _matic,
        uint256 duration
    ){
        hez = _hez;
        matic = _matic;
        withdrawTimeout = block.timestamp + duration;
    }

    /**
     * @notice Method that allows swap HEZ for MATIC tokens at the ratio of 1 HEZ --> 3.5 MATIC
     * Users can either use the permit functionality, or approve previously the tokens and send an empty _permitData
     * @param hezAmount Amount of HEZ to swap
     * @param _permitData Raw data of the call `permit` of the token
     */
    function hezToMatic(uint256 hezAmount, bytes calldata _permitData) public {
        // receive and burn HEZ tokens
        if (_permitData.length != 0) {
            _permit(address(hez), hezAmount, _permitData);
        }

        hez.safeTransferFrom(msg.sender, address(this), hezAmount);
        ERC20Burnable(address(hez)).burn(hezAmount);

        // transfer MATIC tokens
        uint256 maticAmount = (hezAmount * SWAP_RATIO) / 1000;
        matic.safeTransfer(msg.sender, maticAmount);

        emit HezToMatic(hezAmount, maticAmount, msg.sender);
    }

    /**
     * @notice Method that allows the owner to withdraw any token from this contract
     * In order to withdraw MATIC tokens the owner must wait until the withdrawTimeout expires
     * @param tokenAddress Token address
     * @param amount Amount of tokens to withdraw
     */
    function withdrawTokens(address tokenAddress, uint256 amount) public onlyOwner {
        if(tokenAddress == address(matic)) {
            require(
                block.timestamp > withdrawTimeout,
                "HezMaticMerge::withdrawTokens: TIMEOUT_NOT_REACHED"
            );
        }
        
        IERC20(tokenAddress).safeTransfer(owner(), amount);

        emit WithdrawTokens(tokenAddress, amount);
    }

    /**
     * @notice Method that allows the owner to increase the withdraw timeout
     * @param newWithdrawTimeout new withdraw timeout
     */
    function setWithdrawTimeout(uint256 newWithdrawTimeout) public onlyOwner {
        require(
            newWithdrawTimeout > withdrawTimeout,
             "HezMaticMerge::setWithdrawTimeout: NEW_TIMEOUT_MUST_BE_HIGHER"
        );
        
        withdrawTimeout = newWithdrawTimeout; 
        
        emit NewWithdrawTimeout(newWithdrawTimeout);
    }

    /**
     * @notice Function to extract the selector of a bytes calldata
     * @param _data The calldata bytes
     */
    function _getSelector(bytes memory _data) private pure returns (bytes4 sig) {
        assembly {
            sig := mload(add(_data, 32))
        }
    }

    /**
     * @notice Function to call token permit method of extended ERC20
     + @param token ERC20 token address
     * @param _amount Quantity that is expected to be allowed
     * @param _permitData Raw data of the call `permit` of the token
     */
    function _permit(
        address token,
        uint256 _amount,
        bytes calldata _permitData
    ) internal {
        bytes4 sig = _getSelector(_permitData);
        require(
            sig == _PERMIT_SIGNATURE,
            "HezMaticMerge::_permit: NOT_VALID_CALL"
        );
        (
            address owner,
            address spender,
            uint256 value,
            uint256 deadline,
            uint8 v,
            bytes32 r,
            bytes32 s
        ) = abi.decode(
            _permitData[4:],
            (address, address, uint256, uint256, uint8, bytes32, bytes32)
        );
        require(
            owner == msg.sender,
            "HezMaticMerge::_permit: PERMIT_OWNER_MUST_BE_THE_SENDER"
        );
        require(
            spender == address(this),
            "HezMaticMerge::_permit: SPENDER_MUST_BE_THIS"
        );
        require(
            value == _amount,
            "HezMaticMerge::_permit: PERMIT_AMOUNT_DOES_NOT_MATCH"
        );

        // we call without checking the result, in case it fails and he doesn't have enough balance
        // the following transferFrom should be fail. This prevents DoS attacks from using a signature
        // before the smartcontract call
        /* solhint-disable avoid-low-level-calls */
        address(token).call(
            abi.encodeWithSelector(
                _PERMIT_SIGNATURE,
                owner,
                spender,
                value,
                deadline,
                v,
                r,
                s
            )
        );
    }   
}

File 2 of 9 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/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() {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 3 of 9 : SafeERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../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 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'
        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) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. 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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

File 4 of 9 : ERC20Burnable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 currentAllowance = allowance(account, _msgSender());
        require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
        unchecked {
            _approve(account, _msgSender(), currentAllowance - amount);
        }
        _burn(account, amount);
    }
}

File 5 of 9 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity ^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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 6 of 9 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^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);
}

File 7 of 9 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity ^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;
        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");

        (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");

        (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");

        (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");

        (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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 8 of 9 : ERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

File 9 of 9 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"contract IERC20","name":"_hez","type":"address"},{"internalType":"contract IERC20","name":"_matic","type":"address"},{"internalType":"uint256","name":"duration","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"hezAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"maticAmount","type":"uint256"},{"indexed":true,"internalType":"address","name":"grantee","type":"address"}],"name":"HezToMatic","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"newWithdrawTimeout","type":"uint256"}],"name":"NewWithdrawTimeout","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":false,"internalType":"address","name":"tokenAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"WithdrawTokens","type":"event"},{"inputs":[],"name":"SWAP_RATIO","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"hez","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"hezAmount","type":"uint256"},{"internalType":"bytes","name":"_permitData","type":"bytes"}],"name":"hezToMatic","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"matic","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"newWithdrawTimeout","type":"uint256"}],"name":"setWithdrawTimeout","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawTimeout","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawTokens","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000eef9f339514298c6a857efcfc1a762af84438dee0000000000000000000000007d1afa7b718fb893db30a3abc0cfc608aacfebb00000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _hez (address): 0xeef9f339514298c6a857efcfc1a762af84438dee
Arg [1] : _matic (address): 0x7d1afa7b718fb893db30a3abc0cfc608aacfebb0
Arg [2] : duration (uint256): 0

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000eef9f339514298c6a857efcfc1a762af84438dee
Arg [1] : 0000000000000000000000007d1afa7b718fb893db30a3abc0cfc608aacfebb0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000000


Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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