metamask小狐狸钱包 eth_sendTransaction接口发起指定币种交易
2023-3-15|2023-3-24
夜火/xloong
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Mar 15, 2023
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metamask-eth_sendtransaction-USDT
summary
metamask小狐狸钱包 发起指定币种交易 以USDT为例
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开发
区块链
以太坊
metamask
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Mar 24, 2023 08:39 AM
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
const transactionParameters = { nonce: '0x00', // ignored by MetaMask // gasPrice: '0x09184e72a000', // customizable by user during MetaMask confirmation. // gas: '0x2710', // customizable by user during MetaMask confirmation. to: '0x0000000000000000000000000000000000000000', // Required except during contract publications. from: ethereum.selectedAddress, // must match user's active address. value: '0x00', // Only required to send ether to the recipient from the initiating external account. // data: // '0x7f7465737432000000000000000000000000000000000000000000000000000000600057', // Optional, but used for defining smart contract creation and interaction. chainId: '0x3', // Used to prevent transaction reuse across blockchains. Auto-filled by MetaMask. }; // txHash is a hex string // As with any RPC call, it may throw an error const txHash = await ethereum.request({ method: 'eth_sendTransaction', params: [transactionParameters], }) .then((result) => { console.log("txHash:" + result) }) .catch((error) => { console.log("error:" + error.code) });;
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。。。
// 假设你已经有了USDT合约的地址和ABI const USDTContractAddress = "..."; // USDT合约地址 const USDTContractABI = [...]; // USDT合约ABI const recipientAddress = "0x..."; // 接收地址 const amount = 100; // 要发送的代币数量，单位为wei // 创建一个web3实例，连接到metamask提供的provider const web3 = new Web3(window.ethereum); // 获取当前用户的账户地址 const accounts = await ethereum.request({ method: 'eth_requestAccounts' }); const senderAddress = accounts[0]; // 创建一个USDT合约实例 const USDTContract = new web3.eth.Contract(USDTContractABI, USDTContractAddress); // 调用USDT合约的transfer方法，生成data字段 const data = USDTContract.methods.transfer(recipientAddress, amount).encodeABI(); // 构造交易参数对象 const txParams = { from: senderAddress, to: USDTContractAddress, value: "0x0", // 不发送以太币，只发送代币 gas: web3.utils.toHex(21000), // 设置gas limit，可以根据实际情况调整 gasPrice: web3.utils.toHex(web3.utils.toWei('10', 'gwei')), // 设置gas price，可以根据实际情况调整 data: data // 填入之前生成的data字段 }; // 调用metamask的eth_sendTransaction方法，发送交易并获取交易哈希 const txHash = await ethereum.request({ method: 'eth_sendTransaction', params: [txParams], }); // 打印交易哈希或者做其他操作 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
USDT合约地址：0x55d398326f99059fF775485246999027B3197955
上面的页面内就有ABI代码：
[{"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"}]