1. Dashboard > Streams > Create Stream
2. Select chain: Ethereum Mainnet
3. Filter: Contract events for specific address
4. Destination: Webhook URL
5. Set payload format: JSON

import express from 'express';

const app = express();
app.post('/webhooks/quicknode', express.json(), async (req, res) => {
  const events = req.body;
  for (const event of events) {
    console.log(`Block: ${event.blockNumber}`);
    console.log(`TX: ${event.transactionHash}`);
    console.log(`Topics: ${event.topics}`);
    // Process on-chain event
    await processBlockchainEvent(event);
  }
  res.status(200).json({ received: true });
});

// Stream filter function (runs on QuickNode infrastructure)
function main(data) {
  const targetContract = '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48'; // USDC
  const transferTopic = '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef';
  
  return data.streamData.filter(tx => {
    return tx.logs?.some(log =>
      log.address.toLowerCase() === targetContract.toLowerCase() &&
      log.topics[0] === transferTopic
    );
  });
}