usdt(erc20) transfer demo

usdt_erc20_transfer_demo.js

// Created by Chih.Lun.Kang
// 網路上找的範例大部分都不能用，後來嘗試數次只有這方法可行
// 主網的appid => 539ab33xxxx，要去Infura申請，在上面建立一個project
// ####  NOTE  #### : 要特別注意本身轉帳的帳號要儲備足夠數量的 eth 跟 btc 
// ####  注意  #### : 目前使用人工轉換儲值手續費，建議在幣價好的時候一次換匯才划算

const USDTJSON = require('./build/contracts/USDT.json')
const Web3 = require('web3')
const Tx = require('ethereumjs-tx').Transaction

const rpcEndpoint = `https://mainnet.infura.io/v3/539ab33d0e2f4755a3b0fa5746dccad2`

var fromAddress = '0x8546ecA807B4789b3734525456643fd8F239c795' //從哪個帳戶
var toAddress = '0x9F2Fde2AfDD7210CE69B33262a031c7c0361a4a8' //目標帳戶
var privateKey = 'your private key here'

const web3 = new Web3(new Web3.providers.HttpProvider(rpcEndpoint))
// USDT contract 連結 https://etherscan.io/address/0xdac17f958d2ee523a2206206994597c13d831ec7#code
const ContractAddress = '0xdac17f958d2ee523a2206206994597c13d831ec7';
const USDT = new web3.eth.Contract(USDTJSON.abi, ContractAddress,{from: fromAddress})
let amount = web3.utils.toHex(2710)

async function main() {

  web3.eth.getTransactionCount(fromAddress)
  .then((count) => {
    let rawTransaction = {
      'from': fromAddress,
      'gasPrice': web3.utils.toHex(20 * 1e9),
      'gasLimit': web3.utils.toHex(210000),
      'to': ContractAddress,
      'value': 0x0,
      'data': USDT.methods.transfer(toAddress, amount).encodeABI(),
      'nonce': web3.utils.toHex(count)
    }
    let transaction = new Tx(rawTransaction)
    transaction.sign(Buffer.from(privateKey, 'hex'))
    web3.eth.sendSignedTransaction('0x' + transaction.serialize().toString('hex'))
      .on('transactionHash', console.log)
  })
}

main().then(() => {
}).catch((e) => {
  console.log("error", e);
})