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Billing and Rate Limits

Opening a new WebSocket connection costs 1 credit. All WebSocket streaming data (Standard and Enhanced) is metered at 2 credits per 0.1 MB. Standard WSS metering activates on April 12, 2026 after a 30-day grace period.
Enhanced WebSockets are, on average, 1.5x - 2x faster than standard WebSockets. They provide faster response times through optimized infrastructure and direct access to Helius’s streaming backend, making them ideal for high-performance applications requiring low-latency data.

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Disconnects and Retries

Enhanced WebSockets have a 10-minute inactivity timer that disconnects idle connections. To prevent disconnections:
  1. Implement health checks: Send pings every minute to keep connections alive
  2. Add reconnection logic: Automatically reconnect when disconnections occur
  3. Use proper connection management: Follow the patterns shown in our Enhanced WebSockets documentation
Implement reconnection and ping logic as shown in our documentation, then add your application logic on top of this foundation.

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Using WebSockets

Standard and Enhanced WebSockets now use the same endpoints for Solana Mainnet and Devnet respectively: wss://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY and wss://devnet.helius-rpc.com/?api-key=YOUR_API_KEY. For the fastest Solana WebSockets, try the new Gatekeeper (Beta) WebSockets endpoint: wss://beta.helius-rpc.com/?api-key=YOUR_API_KEY.
Yes, we will continue supporting the original wss://atlas-mainnet.helius-rpc.com/?api-key=YOUR_API_KEY and wss://atlas-devnet.helius-rpc.com/?api-key=YOUR_API_KEY endpoints for Enhanced WebSockets. However, we encourage developers to migrate to the new, unified WebSockets endpoints for simplicity.
Historically, Standard WebSockets were served via RPCs and supported all standard Solana subscription methods (e.g., accounts, programs, logs, etc.). while Enhanced WebSockets were served via Geyser and only supported accountSubscribe and transactionSubscribe. Today, Standard WSS and Enhanced WSS are both powered by LaserStream, and can be used from the same API endpoint. We recommend all developers use the unified WSS endpoint for simplicity.
On the Free plan, you can make 5 simultaneous WebSocket connections. On the Developer plan, 150 connections are possible. On Business, you can make 250 connections, and on Professional, up to 1,000 WebSocket connections.
The client needs to keep up with the rate of incoming messages from the WebSocket server.Common causes of your client missing WebSocket updates include: insufficient network bandwidth, too slow client-side processing (e.g. a too slow programming language), or processing logic that blocks the main thread.
Yes, you can create multiple subscriptions to accountSubscribe using the same WebSocket connection.
For Enhanced WebSockets, set transactionDetails: "full" in your subscription options:
const subscriptionRequest = {
  jsonrpc: "2.0",
  id: 1,
  method: "transactionSubscribe",
  params: [
    {
      accountInclude: ["YOUR_ACCOUNT_ADDRESS"],
      failed: false,
      vote: false
    },
    {
      commitment: "confirmed",
      encoding: "jsonParsed",
      transactionDetails: "full",  // Full transaction details
      maxSupportedTransactionVersion: 0
    }
  ]
};
For Standard WebSockets, use logsSubscribe or signatureSubscribe methods depending on your monitoring needs. See our WebSocket guide for detailed examples of each subscription type.

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