WebSocket API

The versioned public WebSocket contract for live UDX market data. Clients authenticate and negotiate udx.json.2026-08-11 during the HTTP Upgrade, then exchange the JSON messages defined here. This version supports authenticated public L2 order books only; L1, L3, and private account channels are not part of this closed contract. Every concept and identifier on the wire belongs to the UDX public model.

Version 2026-08-11

Serverswss://api.uat.udx.underdogsports.comwss://api.udx.underdogsports.com

Market Data

Live public order book subscriptions and recovery.

RECEIVE
Subscribe to Order Book Updates/ws
RECEIVE
Unsubscribe from Order Book Updates/ws
RECEIVE
Request Order Book Snapshots/ws
SEND
Stream Order Book Data/ws