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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, not a venue-specific ticker. Both venues arrive on the same channel, tagged by venue field. 
wss://feeds.oddpool.com/ws

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Authentication

Send an auth message with your API key after connecting. The server responds with your tier and limits. 
// Send
{"action": "auth", "api_key": "oddpool_abc123..."}

// Response
{
  "type": "auth",
  "status": "ok",
  "user_id": 42,
  "tier": "pro",
  "limits": {
    "max_events": 10,
    "max_connections": 3,
    "channels": ["dist", "book", "trade", "snapshot"]
  }
}

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Subscribe and unsubscribe

Subscribe to channels by event. Events count as concurrent subscriptions — unsubscribing frees up slots.

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Channel format

FormatExampleScope
{type}:{event_key}dist:fomc-2026-04-29All outcomes for that event
{type}:{event_key}:{outcome}book:fomc-2026-04-29:holdSingle outcome

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Example

// Subscribe to multiple channels at once
{"action": "subscribe", "channels": ["dist:fomc-2026-04-29", "book:fomc-2026-04-29:hold"]}

// Response
{"type": "subscribed", "channels": ["dist:fomc-2026-04-29", "book:fomc-2026-04-29:hold"]}

// Unsubscribe
{"action": "unsubscribe", "channels": ["book:fomc-2026-04-29:hold"]}