web3.js
Terhubung ke 256 Blocks menggunakan web3.js
web3.js adalah API JavaScript Ethereum asli, menyediakan kumpulan pustaka untuk berinteraksi dengan node Ethereum. Panduan ini mencakup web3.js v4.
Instalasi
npm install web3Atau dengan yarn:
yarn add web3Mulai Cepat
Terhubung ke 256 Blocks menggunakan header X-API-Key dengan HttpProvider:
import { Web3, HttpProvider } from 'web3';
// Configure provider with custom headers
const httpOptions = {
providerOptions: {
headers: {
'X-API-Key': 'your-api-key'
}
}
};
// Create the provider and Web3 instance
const provider = new HttpProvider('https://rpc.256blocks.com/ethereum', httpOptions);
const web3 = new Web3(provider);
// Get the latest block number
const blockNumber = await web3.eth.getBlockNumber();
console.log('Latest block:', blockNumber);Membaca Saldo Akun
import { Web3, HttpProvider } from 'web3';
const httpOptions = {
providerOptions: {
headers: {
'X-API-Key': 'your-api-key'
}
}
};
const provider = new HttpProvider('https://rpc.256blocks.com/ethereum', httpOptions);
const web3 = new Web3(provider);
// Get account balance
const address = '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb';
const balance = await web3.eth.getBalance(address);
console.log('Balance:', web3.utils.fromWei(balance, 'ether'), 'ETH');Membaca Data Kontrak
import { Web3, HttpProvider } from 'web3';
const httpOptions = {
providerOptions: {
headers: {
'X-API-Key': 'your-api-key'
}
}
};
const provider = new HttpProvider('https://rpc.256blocks.com/ethereum', httpOptions);
const web3 = new Web3(provider);
// ERC-20 ABI (minimal)
const erc20Abi = [
{
name: 'balanceOf',
type: 'function',
stateMutability: 'view',
inputs: [{ name: 'account', type: 'address' }],
outputs: [{ name: '', type: 'uint256' }]
},
{
name: 'decimals',
type: 'function',
stateMutability: 'view',
inputs: [],
outputs: [{ name: '', type: 'uint8' }]
}
];
// USDC contract on Ethereum
const usdcAddress = '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48';
const contract = new web3.eth.Contract(erc20Abi, usdcAddress);
const balance = await contract.methods.balanceOf('0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb').call();
const decimals = await contract.methods.decimals().call();
// Convert balance to human-readable format
const formattedBalance = Number(balance) / Math.pow(10, Number(decimals));
console.log('USDC Balance:', formattedBalance);Dukungan Multi-Chain
Terhubung ke chain yang berbeda dengan mengubah endpoint:
import { Web3, HttpProvider } from 'web3';
function createWeb3(chain, apiKey) {
const httpOptions = {
providerOptions: {
headers: {
'X-API-Key': apiKey
}
}
};
const provider = new HttpProvider(`https://rpc.256blocks.com/${chain}`, httpOptions);
return new Web3(provider);
}
// Create Web3 instances for different chains
const ethWeb3 = createWeb3('ethereum', 'your-api-key');
const baseWeb3 = createWeb3('base', 'your-api-key');
const arbWeb3 = createWeb3('arbitrum', 'your-api-key');
const polygonWeb3 = createWeb3('polygon', 'your-api-key');