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What are Enhanced Websockets?

Helius provides Enhanced WebSockets in addition to Solana’s standard WebSocket methods. These enhanced WebSockets offer faster response times than traditional WebSockets. We support two subscription methods: transactionSubscribe and accountSubscribe.
Enhanced WebSockets are available on Business and Professional plans. Users who upgrade to these plans after October 16, 2025 are metered at 3 credits per 0.1 MB of streamed data. Users on these plans before this date remain unmetered. This is separate from Yellowstone gRPC functionality available through LaserStream or Dedicated Nodes.
For high-volume data streaming on Professional plans, Data Add-Ons provide included monthly data allowances (5TB-100TB) for predictable costs. Data Add-Ons apply to both LaserStream and Enhanced WebSockets usage.

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Subscription Endpoints

Geyser-enhanced WebSockets are currently available on mainnet and devnet with the following URLs Mainnet: wss://atlas-mainnet.helius-rpc.com/?api-key=<API_KEY> Devnet: wss://atlas-devnet.helius-rpc.com/?api-key=<API_KEY>
Websockets have a 10-minute inactivity timer; to keep the WebSocket connection alive, it is highly recommended that health checks be implemented and that pings be sent every minute.