One API Key.
All Chains.

// Initialize Crakn with a single API key
const crakn = new Crakn({
  apiKey: "YOUR_API_KEY",
  chains: ["ethereum", "polygon", "arbitrum"]
});

// Listen for specific events
crakn.on("transfer", (event) => {
  // Send notification to user
  notifyUser({
    title: "Transfer Detected",
    body: `${event.amount} tokens transferred`,
    data: event
  });
});