Websockets

Use Websockets for low-latency market and account updates.

Authentication models

Use the auth model required by each stream:

• No auth for Order Book, Chance History, Activity Feed, and Last Trades Feed

• In-band AUTH for Order Updates, Balance Updates, and Order Feed

• Private streams use API key auth only

After reconnect, authenticate again and restore every subscription.

Endpoint pages

• Order Book — real-time best bid, best ask, and last chance per outcome

• Chance History — live probability updates and chart history

• Account & History Streams — orders, balances, activity, and last trades

• WebSocket API Reference — full auth, message, and stream reference

Private stream auth

Send this message right after connect.

{
  "t": "AUTH",
  "d": {
    "apiKey": "<API_KEY>",
    "signature": "<SIGNATURE>",
    "timestamp": "<UNIX_EPOCH_SECONDS>"
  }
}

Build signature from timestamp + "GET" + path.

Stream groups

Public market data

Connect directly:

• wss://order-book.outpoll.com/event/ws

• wss://chance-history-service.outpoll.com/ws

Private account data

Send AUTH after connect:

• wss://order-service.outpoll.com/order/ws

• wss://wallet-mutator-view.outpoll.com/balance/ws

• wss://history-service.outpoll.com/order/ws

Public activity and trade broadcasts

No auth required:

• wss://history-service.outpoll.com/history/ws

• wss://history-service.outpoll.com/last-trades/ws