Stream real-time prediction market data over a single WebSocket connection.
Stream real-time, normalized prediction market data over WebSocket. One connection gives you cross-venue orderbooks, trades, and probability distributions from both Kalshi and Polymarket — no venue-specific code needed.Data is addressed by what, not where. You subscribe to dist:fomc-2026-04-29 or dist:btc-5m-2026-03-24-0830-et, not a venue-specific ticker. Both venues arrive on the same channel, tagged by venue field.Two feeds are available:
channels lists the channels that were actually subscribed. If any submitted channel was dropped, the response also includes a rejected array — only present when there is at least one rejection. Each entry has a channel and a reason:
reason
When it fires
unknown_event_key
The event_key is not currently served. Use Catalog to find valid keys; venue-native IDs (Kalshi market tickers, Polymarket condition IDs) are not event keys.
unknown_channel_type
The prefix is not one of dist, book, trade, snapshot.
missing_event_key
The channel string has no event_key after the type prefix.
dist, book, and trade are change-driven — messages emit only when the underlying state changes, so an idle channel is normal during quiet windows. For current state on connect, also subscribe to snapshot:{event_key}, which delivers a full state message every 60 seconds.
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