The Delphi Markets WebSocket API provides real-time streaming for price updates, orderbook snapshots, and trade executions across all supported exchanges.Documentation Index
Fetch the complete documentation index at: https://docs.delphimarkets.com/llms.txt
Use this file to discover all available pages before exploring further.
Supported streams
Kalshi
Subscribe using
klsi_id. Prices, orderbook (101-level depth), and trades.Polymarket
Subscribe using
condition_id. Prices, orderbook, and trades.Predict.fun
Subscribe using
market_id. Prices, orderbook, and trades.Limitless
Subscribe using
market_id. Prices, orderbook, and trades.Gemini
Subscribe using
market_id. Prices, orderbook, and trades.Manifold
Subscribe using
market_id. Prices, orderbook, and trades.Opinion
Subscribe using
market_id. Prices, orderbook, and trades.ForecastEx
Subscribe using
market_id. Prices and trades (no orderbook).PredictIt
Subscribe using
market_id. Prices only.Parlays
Subscribe using
market_ids. RFQ events and MVE trades. Requires Pro+ plan.How it works
- Connect to the WebSocket endpoint for your exchange
- Subscribe by sending a JSON message with market IDs and message types
- Receive real-time updates as JSON messages
- Unsubscribe or disconnect when done
Common connection details
All WebSocket streams share these properties:| Property | Value |
|---|---|
| Protocol | WebSocket (wss://) |
| Authentication | API key via api_key query parameter |
| Keepalive | Ping every 54 seconds |
| Timeout | 60 seconds without pong |
| Default message types | Prices and orderbook |
Subscription key reference
| Exchange | Endpoint | Subscription key | Message types |
|---|---|---|---|
| Kalshi | /ws/kalshi | klsi_ids | prices, orderbook, trades |
| Polymarket | /ws/poly | condition_ids | prices, orderbook, trades |
| Predict.fun | /ws/pfun | market_ids | prices, orderbook, trades |
| Limitless | /ws/limitless | market_ids | prices, orderbook, trades |
| Gemini | /ws/gemi | market_ids | prices, orderbook, trades |
| Manifold | /ws/mani | market_ids | prices, orderbook, trades |
| Opinion | /ws/opnm | market_ids | prices, orderbook, trades |
| ForecastEx | /ws/fex | market_ids | prices, trades |
| PredictIt | /ws/prdi | market_ids | prices |
| Parlays | /ws/parlays | market_ids | rfq, mve_trades |

