Getting Started

// Requirements: Node.js 24 or later
//   npm install @pythnetwork/pyth-lazer-sdk
//   npm pkg set type=module
//
// Usage:
//   node pyth-pro-example.ts

import { PythLazerClient } from "@pythnetwork/pyth-lazer-sdk";

// Read your API key from the environment (never hard-code it)
const token = process.env.PYTH_PRO_API_KEY;
if (!token) throw new Error("Set PYTH_PRO_API_KEY in your environment");

// Create the Pyth Pro client with WebSocket pool configuration
const client = await PythLazerClient.create({
  token,
  webSocketPoolConfig: {
    urls: [
      "wss://pyth-lazer-0.dourolabs.app/v1/stream",
      "wss://pyth-lazer-1.dourolabs.app/v1/stream",
      "wss://pyth-lazer-2.dourolabs.app/v1/stream",
    ],
  },
});

// Subscribe to price feeds
client.subscribe({
  type: "subscribe",
  subscriptionId: 1,
  priceFeedIds: [3191, 327, 1],
  properties: ["price", "feedUpdateTimestamp"],
  formats: ["solana"],
  channel: "fixed_rate@200ms",
  deliveryFormat: "json",
  jsonBinaryEncoding: "hex",
  parsed: true,
  ignoreInvalidFeeds: true, // Ignore invalid feed IDs instead of failing
});

// Listen for price updates
client.addMessageListener((message) => {
  if (message.type === "json") {
    console.log("Received JSON update:", JSON.stringify(message.value, null, 2));
  } else {
    console.log("Received binary update:", {
      subscriptionId: message.value.subscriptionId,
      parsed: message.value.parsed,
    });
  }
});

// Handle connection errors
client.addAllConnectionsDownListener(() => {
  console.error("All WebSocket connections are down!");
});

// To unsubscribe later:
// client.unsubscribe(1);

// To shutdown the client:
// client.shutdown();