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如何使用 Kaia SDK 发送 ERC-20 代币（USDT 示例）

概述​

在本指南中，您将学习如何在 Kaia 区块链上使用 ethers-ext SDK 以 USDT 为例，以编程方式发送 ERC 20 代币。 Kaia SDK 是一系列库的集合，包括 ethers-ext、web3js-ext、viem-ext、web3j-ext 和 web3py-ext，可帮助开发人员在不同的编程环境中与 Kaia 节点交互。

本指南主要介绍如何使用 ethers-ext SDK 通过智能合约调用发送 USDT 代币。

先决条件​

步骤 1：设置项目并安装 ethers-ext 和 ethers.js​


mkdir send-usdt-kaiasdk
cd send-usdt-kaiasdk
npm init -y
npm install --save @kaiachain/ethers-ext ethers@6 dotenv

步骤 2：设置提供程序和钱包实例​

创建一个名为 index.js 的新文件，并将下面的代码粘贴到该文件中。


import { ethers } from "ethers";
import { Wallet, JsonRpcProvider, parseKaiaUnits } from "@kaiachain/ethers-ext/v6";
import "dotenv/config";
const senderPriv = process.env.USDT_SENDER;
const recipientAddress = "PASTE_RECIPIENT_ADDRESS"
const amount = parseKaiaUnits("0.01", 6);
const provider = new JsonRpcProvider("https://public-en.node.kaia.io");
const wallet = new Wallet(senderPriv, provider);

步骤 3：创建 USDT 合约实例​


const USDT_CONTRACT_ABI = [
{
"inputs": [
{
"internalType": "address",
"name": "recipient",
"type": "address"
},
{
"internalType": "uint256",
"name": "amount",
"type": "uint256"
}
],
"name": "transfer",
"outputs": [
{
"internalType": "bool",
"name": "",
"type": "bool"
}
],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "account",
"type": "address"
}
],
"name": "balanceOf",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
}
]
const USDT_CONTRACT_ADDRESS = "0xd077a400968890eacc75cdc901f0356c943e4fdb";
async function main() {
const USDT_CONTRACT = new ethers.Contract(USDT_CONTRACT_ADDRESS, USDT_CONTRACT_ABI, wallet);
}

步骤 4：发送令牌​


async function main() {
const USDT_CONTRACT = new ethers.Contract(USDT_CONTRACT_ADDRESS, USDT_CONTRACT_ABI, wallet);
console.log("balance of recipient before", (await USDT_CONTRACT.balanceOf(recipientAddress)).toString());
const sentTx = await USDT_CONTRACT.transfer(recipientAddress, amount);
const receipt = await sentTx.wait();
console.log("receipt", receipt.hash);
console.log("balance of recipient after", (await USDT_CONTRACT.balanceOf(recipientAddress)).toString());
}
main();

完整代码


import { ethers } from "ethers";
import { Wallet, JsonRpcProvider, parseKaiaUnits } from "@kaiachain/ethers-ext/v6";
import "dotenv/config";
const senderPriv = process.env.USDT_SENDER;
const recipientAddress = "PASTE RECIPIENT ADDRESS"
const amount = parseKaiaUnits("0.01", 6);
const provider = new JsonRpcProvider("https://public-en.node.kaia.io");
const wallet = new Wallet(senderPriv, provider);
/*
Get USDT ABI here: https://kaiascan.io/address/0xd077a400968890eacc75cdc901f0356c943e4fdb?tabId=contract&page=1
*/
const USDT_CONTRACT_ABI = [
{
"inputs": [
{
"internalType": "address",
"name": "recipient",
"type": "address"
},
{
"internalType": "uint256",
"name": "amount",
"type": "uint256"
}
],
"name": "transfer",
"outputs": [
{
"internalType": "bool",
"name": "",
"type": "bool"
}
],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "account",
"type": "address"
}
],
"name": "balanceOf",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
}
]
const USDT_CONTRACT_ADDRESS = "0xd077a400968890eacc75cdc901f0356c943e4fdb";
async function main() {
const USDT_CONTRACT = new ethers.Contract(USDT_CONTRACT_ADDRESS, USDT_CONTRACT_ABI, wallet);
console.log("balance of recipient before", (await USDT_CONTRACT.balanceOf(recipientAddress)).toString());
const sentTx = await USDT_CONTRACT.transfer(recipientAddress, amount);
const receipt = await sentTx.wait();
console.log("receipt", receipt.hash);
console.log("balance of recipient after", (await USDT_CONTRACT.balanceOf(recipientAddress)).toString());
}
main();

在终端运行 node index.js 查看事务执行情况。

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