Imported from jeremylongshore/tons-of-skills-marketplace (
skills/.curated/quicknode-core-workflow-a/SKILL.md). Install upstream withnpx skills add jeremylongshore/tons-of-skills-marketplace --skill quicknode-core-workflow-a. Copyright stays with the author (MIT).
QuickNode Core Workflow A
Overview
Build EVM transaction workflows: send ETH, interact with contracts, listen for events, and handle gas estimation.
Prerequisites
- Completed
quicknode-hello-world - A funded wallet (use testnet for development)
Instructions
Step 1: Send ETH Transaction
import { ethers } from 'ethers';
const provider = new ethers.JsonRpcProvider(process.env.QUICKNODE_ENDPOINT);
const wallet = new ethers.Wallet(process.env.PRIVATE_KEY!, provider);
const tx = await wallet.sendTransaction({
to: '0xRecipientAddress',
value: ethers.parseEther('0.01'),
});
console.log(`TX sent: ${tx.hash}`);
const receipt = await tx.wait();
console.log(`Confirmed in block ${receipt!.blockNumber}, gas used: ${receipt!.gasUsed}`);Step 2: Call Contract Write Function
const contractAddress = '0xYourContract';
const abi = ['function transfer(address to, uint256 amount) returns (bool)'];
const contract = new ethers.Contract(contractAddress, abi, wallet);
const tx = await contract.transfer('0xRecipient', ethers.parseUnits('100', 18));
const receipt = await tx.wait();
console.log(`Transfer confirmed: ${receipt!.hash}`);Step 3: Listen for Events (WebSocket)
const wsProvider = new ethers.WebSocketProvider(process.env.QUICKNODE_WSS);
const contract = new ethers.Contract(contractAddress, ['event Transfer(address indexed from, address indexed to, uint256 value)'], wsProvider);
contract.on('Transfer', (from, to, value, event) => {
console.log(`Transfer: ${from} -> ${to}: ${ethers.formatUnits(value, 18)}`);
});Step 4: Gas Estimation
const gasEstimate = await contract.transfer.estimateGas('0xRecipient', ethers.parseUnits('100', 18));
const feeData = await provider.getFeeData();
const totalCost = gasEstimate * (feeData.gasPrice || 0n);
console.log(`Estimated gas: ${gasEstimate}, cost: ${ethers.formatEther(totalCost)} ETH`);Output
- ETH transfer with receipt confirmation
- Smart contract interaction
- Real-time event listening via WebSocket
- Gas estimation before transactions
Error Handling
| Error | Cause | Solution |
|---|---|---|
insufficient funds |
Wallet balance too low | Fund wallet or reduce amount |
nonce too low |
Nonce conflict | Get latest nonce: provider.getTransactionCount(address) |
gas required exceeds allowance |
Contract revert | Check contract requirements |
Resources
Next Steps
NFT and token APIs: quicknode-core-workflow-b