Integrate API keys using Stacks.js

import { createApiKeyMiddleware, createFetchFn } from "@stacks/common";
import { StacksMainnet, StacksTestnet } from "@stacks/network";

// Create middleware with your API key
const apiMiddleware = createApiKeyMiddleware({
  apiKey: process.env.HIRO_API_KEY
});

// Create custom fetch function
const customFetch = createFetchFn(apiMiddleware);

// Configure network with API key
const network = new StacksMainnet({
  fetchFn: customFetch
});