WebSocket PubSub

Solana WebSocket RPC provides subscription methods over a persistent connection, documented in Solana WebSocket RPC docs.

Method	Best for
accountSubscribe	Watching one account.
logsSubscribe	Streaming transaction logs.
programSubscribe	Watching accounts owned by a program.
slotSubscribe	Tracking slot progression.
signatureSubscribe	Waiting for a transaction signature.

import WebSocket from 'ws';
const ws = new WebSocket(process.env.SOLANA_WS_URL ?? 'ws://127.0.0.1:8900');
ws.on('open', () => ws.send(JSON.stringify({ jsonrpc: '2.0', id: 1, method: 'slotSubscribe' })));

warning

Subscriptions are not durable queues. Combine HTTP backfill with live sync.