Tooling
Websocket Feed
Real-time streaming channel delivering live Kalshi market data (order book, trades, and ticks).
Detailed explanation
A WebSocket feed is Kalshi’s real-time data channel that pushes live market events, bids, asks, trades, and price ticks as they occur. Unlike REST, which is request-based, the WebSocket stream maintains an open connection so you receive updates instantly without polling. The feed is typically authenticated via API key signing and is designed for low-latency trading workflows, including arb scanners and algos.
Worked example
If YES is priced at 42¢ and NO at 56¢, the summed best asks total 98¢, creating a 2¢ edge on a complete YES/NO pair. A trader using the WebSocket feed would see both quotes update in real time, allowing immediate execution to lock the edge.
FAQ
- What data does the WebSocket feed provide?
- It streams live order book snapshots and deltas, recent trades, and ticker updates for Kalshi markets, enabling streaming arb logic.
- How is authentication handled?
- Access is via API key with signed timestamp headers; the feed is a secured, non-public data channel.
- How does it differ from REST data?
- REST is request/response and may incur polling latency, while WebSocket delivers continuous real-time updates with lower latency for scalps and arbitrage signals.
See Websocket Feed on a live Kalshi market
KalshiArb scans every open Kalshi market for arbitrage edges where YES + NO < $1.00. Plug in your Kalshi API key and start receiving alerts in under 5 minutes.