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Documentation Index

Fetch the complete documentation index at: https://www.helius.dev/docs/llms.txt

Use this file to discover all available pages before exploring further.

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Quick Setup

Get streaming Solana data in minutes with working code examples. Choose your approach based on your needs:
MethodBest ForPlan RequiredLatency
Shred DeliveryHFT, MEV, arbitrage — pre-execution dataWhite-glove (Beta)Earliest possible
LaserStream gRPCMission-critical, backend servicesDeveloper+ (Devnet), Business+ (Mainnet)Fastest
LaserStream WebSocketMost apps, real-time UIs, broad compatibility.Free+ (Helius extensions: Developer+)Fast
WebhooksServer notifications, event-driven appsFree+Variable
Interested in trying LaserStream? Apply for a 2-day trial; we review every application.

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Option 1: LaserStream gRPC

Most reliable option with 24-hour historical replay and multi-node failover. Best for mission-critical backends and indexers. 
npm install helius-laserstream

import { subscribe, CommitmentLevel, LaserstreamConfig, SubscribeRequest } from 'helius-laserstream';

async function main() {
  const subscriptionRequest: SubscribeRequest = {
    transactions: {
      "token-filter": { // user-defined label for this filter
        accountInclude: ['TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA'],
        accountExclude: [],
        accountRequired: [],
        vote: false,
        failed: false
      }
    },
    commitment: CommitmentLevel.CONFIRMED,
    accounts: {},
    slots: {},
    transactionsStatus: {},
    blocks: {},
    blocksMeta: {},
    entry: {},
    accountsDataSlice: [],
  };

  const config: LaserstreamConfig = {
    apiKey: 'YOUR_API_KEY',
    endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com',
  }

  await subscribe(config, subscriptionRequest, async (data) => {
    console.log(data);
  }, async (error) => {
    console.error(error);
  });
}

main().catch(console.error);

LaserStream Guide

Complete LaserStream documentation with historical replay

LaserStream Trial

Apply for a 2-day LaserStream trial before upgrading your plan

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Option 2: LaserStream WebSocket

LaserStream WebSocket serves the standard Solana subscription methods and Helius extensions like transactionSubscribe on a single unified endpoint. Perfect for browser/UI clients and broad ecosystem compatibility. 
const WebSocket = require('ws');

const ws = new WebSocket('wss://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY');

ws.on('open', () => {
  console.log('WebSocket connected');

  // Helius extension: transactionSubscribe with rich filtering
  ws.send(JSON.stringify({
    jsonrpc: "2.0",
    id: 1,
    method: "transactionSubscribe",
    params: [
      {
        accountInclude: ["TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"],
        vote: false,
        failed: false
      },
      {
        commitment: "confirmed",
        encoding: "jsonParsed",
        transactionDetails: "full"
      }
    ]
  }));

  // Keep connection alive
  setInterval(() => ws.ping(), 30000);
});

ws.on('message', (data) => {
  const message = JSON.parse(data);
  console.log('Transaction:', message);
});
Replace YOUR_API_KEY with your key from dashboard.helius.dev.

LaserStream WebSocket Overview

All subscription methods (standard Solana + Helius extensions) with parameter reference and examples

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Option 3: Webhooks

For server-side applications that need event notifications without holding a persistent connection. 
# Create a webhook
curl -X POST "https://api-mainnet.helius-rpc.com/v0/webhooks" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "webhookURL": "https://your-server.com/webhook",
    "transactionTypes": ["Any"],
    "accountAddresses": ["YOUR_ACCOUNT_ADDRESS"],
    "webhookType": "enhanced"
  }'

// Handle webhook events (Express.js example)
app.post('/webhook', (req, res) => {
  req.body.forEach(event => {
    console.log('Blockchain event:', event);
  });
  res.status(200).send('OK');
});

Webhooks Guide

Complete webhook setup and event handling

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Common Use Cases

Monitor Token Transfers 
// Subscribe to Token Program activity
method: "programSubscribe",
params: ["TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA", {...}]
Track Pump.fun trades 
// Subscribe to Pump.fun program transactions
method: "transactionSubscribe",
params: [
  {
    accountInclude: ["6EF8rrecthR5Dkzon8Nwu78hRvfCKubJ14M5uBEwF6P"],
    vote: false,
    failed: false
  },
  { commitment: "confirmed" }
]
Watch Wallet Activity 
// Monitor specific wallet
method: "accountSubscribe",
params: ["WALLET_ADDRESS", {...}]

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Next Steps

Streaming Overview

Learn about all streaming options and when to use each

API Reference

Complete method documentation and parameters
Need help? Join our Discord or check support docs.