USDT 到 TRX 转换智能合约 - Solidity 示例

下面是一个基于 Solidity 的 ERC-20 智能合约的示例，该合约可以接收用户转入的 USDT，并按照一定比例将 TRX 转出到用户的钱包地址中。

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.14;

interface IERC20 {
    function transfer(address to, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
    function balanceOf(address account) external view returns (uint256);
}

contract TRXConverter {
    address private _owner;
    IERC20 private _usdtToken;
    uint256 private _conversionRate;

    event Conversion(address indexed from, uint256 amount, address indexed to);

    constructor(address usdtTokenAddress, uint256 conversionRate) {
        _owner = msg.sender;
        _usdtToken = IERC20(usdtTokenAddress);
        _conversionRate = conversionRate;
    }

    function convert(uint256 amount) external {
        uint256 trxAmount = amount * _conversionRate;
        require(_usdtToken.transferFrom(msg.sender, address(this), amount), 'Transfer failed');
        payable(msg.sender).transfer(trxAmount);

        emit Conversion(msg.sender, amount, msg.sender);
    }

    function setConversionRate(uint256 conversionRate) external {
        require(msg.sender == _owner, 'Only owner can set conversion rate');
        _conversionRate = conversionRate;
    }

    function withdrawUSDT(address to, uint256 amount) external {
        require(msg.sender == _owner, 'Only owner can withdraw USDT');
        require(_usdtToken.balanceOf(address(this)) >= amount, 'Insufficient USDT balance');
        require(_usdtToken.transfer(to, amount), 'Transfer failed');
    }

    function withdrawTRX(address payable to, uint256 amount) external {
        require(msg.sender == _owner, 'Only owner can withdraw TRX');
        require(address(this).balance >= amount, 'Insufficient TRX balance');
        to.transfer(amount);
    }

    function getConversionRate() external view returns (uint256) {
        return _conversionRate;
    }
}

在部署合约时，需要传入 USDT 合约地址和转换比率作为构造函数的参数。合约的所有者可以使用 setConversionRate 函数来更新转换比率。用户可以调用 convert 函数来将 USDT 转换为 TRX，并从合约中提取转换后的 TRX 到他们的钱包地址。所有者还可以使用 withdrawUSDT 和 withdrawTRX 函数来提取合约中的剩余 USDT 和 TRX。

请注意，这只是一个简单的示例合约，实际使用时需要进行更多的测试和安全审计。