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如何使用 Kaia SDK 傳送 ERC-20 代幣（USDT 示例）

概述​

在本指南中，您將學習如何在 Kaia 區塊鏈上使用 ethers-ext SDK 以 USDT 為例，以程式化的方式發送 ERC 20 代幣。 Kaia SDK 是一系列函式庫的集合，包括 ethers-ext、web3js-ext、viem-ext、web3j-ext 和 web3py-ext，可協助開發人員在不同的程式設計環境中與 Kaia 節點互動。

本指南著重於使用 ethers-ext SDK 透過智慧型契約呼叫傳送 USDT 代幣。

先決條件​

步驟 1：設定專案並安裝 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

步驟 2：設定供應商和錢包實例​

建立一個名為 index.js 的新檔案，並貼上下列程式碼。


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);

步驟 3：建立 USDT 合約實例​


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);
}

步驟 4：傳送代幣​


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();

完整代碼


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();

在您的終端執行 node index.js 以查看您的交易已執行。

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