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Contract Source Code (Solidity)

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Outline

• interface WETH9Like
•    - function withdraw(uint)
•    - function deposit()
•    - function transfer(address, uint)
•    - function transferFrom(address, addres ...
• interface WETH10Like
•    - function depositTo(address)
•    - function withdrawFrom(address, addres ...
•  contract WethConverter *
•    - function weth9ToWeth10(address accoun ...
•    - function weth10ToWeth9(address accoun ...

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/**
 *Submitted for verification at Etherscan.io on 2021-05-12
*/

// SPDX-License-Identifier: GPL-3.0-or-later
// Copyright (C) 2015, 2016, 2017 Dapphub
// Adapted by Ethereum Community 2021
pragma solidity 0.7.6;

interface WETH9Like {
    function withdraw(uint) external;
    function deposit() external payable;
    function transfer(address, uint) external returns (bool);
    function transferFrom(address, address, uint) external returns (bool);
}

interface WETH10Like {
    function depositTo(address) external payable;
    function withdrawFrom(address, address, uint256) external;
}

contract WethConverter {
    WETH9Like constant private weth9 = WETH9Like(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2); // ETH wrapper contract v9
    WETH10Like constant private weth10 = WETH10Like(0xf4BB2e28688e89fCcE3c0580D37d36A7672E8A9F); // ETH wrapper contract v10
    
    receive() external payable {}

    function weth9ToWeth10(address account, uint256 value) external payable {
        weth9.transferFrom(account, address(this), value);
        weth9.withdraw(value);
        weth10.depositTo{value: value + msg.value}(account);
    }

    function weth10ToWeth9(address account, uint256 value) external payable {
        weth10.withdrawFrom(account, address(this), value);
        uint256 combined = value + msg.value;
        weth9.deposit{value: combined}();
        weth9.transfer(account, combined);
    }
}

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[{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"weth10ToWeth9","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"weth9ToWeth10","outputs":[],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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ipfs://ed1627289bf6f4e7f31c90bafea22db950eeecbe1070afdaf9d4aefade6b937f