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Stream Blockchain Data: WebSockets Are Here

July 22nd, 2026

Stop polling. Start streaming. Tatum WebSocket subscriptions push on-chain events to your app the instant they happen – over a single persistent connection, with no polling loops and no wasted requests.

Live now on Solana, Ethereum, and Polygon.

What you get

  • Real-time push: events arrive as JSON the moment they land on-chain. No poll intervals, no empty responses.
  • Server-side filtering: subscribe to exactly what you need; the server does the work, you save the bandwidth.
  • Native everywhere: works in browsers and every major language. No special tooling.

Solana: 7 subscription types

Native JSON-RPC 2.0 PubSub: accountSubscribe, logsSubscribe, signatureSubscribe, programSubscribe, slotSubscribe, rootSubscribe, and blockSubscribe – account changes, transaction logs, signature confirmations, program updates, slot progression, roots, and blocks. Each accepts a commitment level (processed, confirmed, finalized).

Ethereum & Polygon: eth_subscribe

Three subscription types via standard JSON-RPC PubSub, identical across both EVM chains:

  • newHeads: new block headers (~12s on Ethereum, ~2s on Polygon). Perfect for explorers and gas dashboards.
  • newPendingTransactions: live mempool hashes for MEV and gas-estimation tooling (high volume — throttle client-side).
  • logs: filtered smart-contract events by address and topics. Reorg-aware via the removed flag.

WebSocket Endpoints

Solana Solana
wss://solana-mainnet.gateway.tatum.io
Ethereum Ethereum
wss://ethereum-mainnet.gateway.tatum.io
Polygon Polygon
wss://polygon-mainnet.gateway.tatum.io

Read more about WebSockets

Data Streaming Overview

WebSockets vs. gRPC — pick the right real-time approach for your workload.

WebSocket Subscriptions

Concepts, subscription flow, and production best practices in one place.

Get an API Key

Free account includes Mainnet and Testnet keys. Start streaming in minutes.

Solana WebSocket

7 subscription types, end-to-end example, commitment levels, and troubleshooting.

Ethereum WebSocket

newHeads, newPendingTransactions, and logs — with payloads and filter patterns.

Polygon WebSocket

Same eth_subscribe types with ~2s block cadence, plus full JSON-RPC on one socket.