WebSocket Overview

Channel	Endpoint	Auth required
Market data	wss://api.pax.markets/v1/public/spot/market-data	No
User data	wss://api.pax.markets/v1/private/spot/user-data	Yes

Try market data in the Playground.

Session flow

1. Connect to the channel’s endpoint.
2. Send subscribe. Read the subscribed reply, then data messages.
3. Send ping at least every 30 seconds. See Keep-alive.
4. When the server disconnects you, reconnect and resubscribe.

Market Data

Real-time book and trade publication using the PAX unified market data event format. Subscribers first get a book snapshot, then a stream of unified event messages, each with all the information needed to understand trade events and reconstruct book state.

See Market Data.

User Data

Real-time order and λ status updates including fills and confirmations. Subscribers first get a snapshot of their open orders and active λs, then a stream of updates.

See User Data.