quicknode-hello-world

name	quicknode-hello-world
description	QuickNode hello world — blockchain RPC and Web3 infrastructure integration. Use when working with QuickNode for blockchain development. Trigger with phrases like "quicknode hello world", "quicknode-hello-world", "blockchain RPC".
allowed-tools	Read, Write, Edit, Bash(npm:*), Bash(curl:*), Grep
version	1.5.0
license	MIT
author	Jeremy Longshore <[e-mail]>
tags	["saas","quicknode","blockchain","web3","rpc","ethereum"]
compatibility	Designed for Claude Code

QuickNode Hello World

Overview

Make your first blockchain queries: get block number, check ETH balance, read a smart contract.

Prerequisites

• Completed quicknode-install-auth with endpoint URL

Instructions

Step 1: Get Block Number

import { ethers } from 'ethers';
const provider = new ethers.JsonRpcProvider(process.env.QUICKNODE_ENDPOINT);

const blockNumber = await provider.getBlockNumber();
console.log(`Current block: ${blockNumber}`);

Step 2: Check ETH Balance

const address = '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045'; // vitalik.eth
const balance = await provider.getBalance(address);
console.log(`Balance: ${ethers.formatEther(balance)} ETH`);

Step 3: Read Smart Contract (ERC-20 Token)

const usdcAddress = '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48';
const abi = ['function balanceOf(address) view returns (uint256)', 'function decimals() view returns (uint8)'];
const usdc = new ethers.Contract(usdcAddress, abi, provider);

const decimals = await usdc.decimals();
const balance =  usdc.(address);
.();