夜火笔记

metamask小狐狸钱包 eth_sendTransaction接口发起指定币种交易

2023-03-15
笔记 metamask以太坊区块链web3
5分钟
909字

手上有个项目需要接入metamask小狐狸钱包充值，之前一直没搞过区块链的开发，一点逻辑都不懂就上手搞了。

切换到币安对应的主网后，用 eth_sendTransaction 可以正常唤起metamask发起交易，但是币种是BNB，而项目需要使用USDT进行交易，接口参数里没有指定币种的地方，试了各种方式均未实现指定币种的效果。

后来发现使用智能合约可以进行指定币种的交易，但是为了这么一块小功能还要去学 solidity ，专门写这么一个合约吗？

仔细想了想，能写出以太坊的人，肯定不能每个人使用都需要自己写合约，应该是有公共的可以大家一起用的那种智能合约，只是我对这块不懂，没有找到，没有想明白，后来仔细搜了下，终于解决了，记录一下代码，免得以后忘记

实现

之前的发起默认币种交易代码

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const transactionParameters = {
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  nonce: '0x00', // ignored by MetaMask
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  // gasPrice: '0x09184e72a000', // customizable by user during MetaMask confirmation.
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  // gas: '0x2710', // customizable by user during MetaMask confirmation.
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  to: '0x0000000000000000000000000000000000000000', // Required except during contract publications.
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  from: ethereum.selectedAddress, // must match user's active address.
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  value: '0x00', // Only required to send ether to the recipient from the initiating external account.
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  // data:
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  //   '0x7f7465737432000000000000000000000000000000000000000000000000000000600057', // Optional, but used for defining smart contract creation and interaction.
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  chainId: '0x3', // Used to prevent transaction reuse across blockchains. Auto-filled by MetaMask.
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};
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// txHash is a hex string
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// As with any RPC call, it may throw an error
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const txHash = await ethereum.request({
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  method: 'eth_sendTransaction',
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  params: [transactionParameters],
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})
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.then((result) => {
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    console.log("txHash:" + result)
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})
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.catch((error) => {
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    console.log("error:" + error.code)
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});;

发起指定币种交易 USDT

有意思的是，不知道是我搜索的方式不对还是什么，怎么都搜不到metamask如何发起指定币种交易的相关内容，最后无可奈何，把问题甩给了chatGPT，经过几次询问后，chatGPT 给了我一个带详细中文注释的代码，修改下参数，可以完美运行，真的是。。。

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// 假设你已经有了USDT合约的地址和ABI
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const USDTContractAddress = "..."; // USDT合约地址
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const USDTContractABI = [...]; // USDT合约ABI
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const recipientAddress = "0x..."; // 接收地址
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const amount = 100; // 要发送的代币数量，单位为wei
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// 创建一个web3实例，连接到metamask提供的provider
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const web3 = new Web3(window.ethereum);
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// 获取当前用户的账户地址
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const accounts = await ethereum.request({ method: 'eth_requestAccounts' });
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const senderAddress = accounts[0];
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// 创建一个USDT合约实例
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const USDTContract = new web3.eth.Contract(USDTContractABI, USDTContractAddress);
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// 调用USDT合约的transfer方法，生成data字段
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const data = USDTContract.methods.transfer(recipientAddress, amount).encodeABI();
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// 构造交易参数对象
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const txParams = {
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  from: senderAddress,
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  to: USDTContractAddress,
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  value: "0x0", // 不发送以太币，只发送代币
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  gas: web3.utils.toHex(21000), // 设置gas limit，可以根据实际情况调整
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  gasPrice: web3.utils.toHex(web3.utils.toWei('10', 'gwei')), // 设置gas price，可以根据实际情况调整
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  data: data // 填入之前生成的data字段
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};
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// 调用metamask的eth_sendTransaction方法，发送交易并获取交易哈希
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const txHash = await ethereum.request({
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  method: 'eth_sendTransaction',
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  params: [txParams],
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});
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// 打印交易哈希或者做其他操作
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console.log(txHash);

（注意，这里用到了 web3.js）

币安USDT合约地址及ABI

有了发起指定币种交易的代码，就要找对应币种的合约地址和ABI，填充进去

币安的USDT合约页面：https://bscscan.com/token/0x55d398326f99059ff775485246999027b3197955#code

USDT合约地址：0x55d398326f99059fF775485246999027B3197955

上面的页面内就有ABI代码：

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[{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","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":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"constant":true,"inputs":[],"name":"_decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"_name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"_symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

参考

MetaMask Docs - Sending Transactions

ethereum JSON-RPC API - eth_sendTransaction

用 Web3 以太坊接口连接与操作 MetaMask 开发指南

Web3.0-使用metamask获取某个账号（钱包地址）的余额、交易回执

How to sign an ethereum transaction with metamask

How to connect ethers.js with metamask?

币安USDT合约

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本文标题：metamask小狐狸钱包 eth_sendTransaction接口发起指定币种交易
文章作者：夜火/xloong
发布时间：2023-03-15
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