KALSHI Websocket: Real-Time KALSHI Data Feeds
Kalshi provides live market data through both REST and WebSocket interfaces. The kalshi websocket is the feed you use for real-time updates to bids, asks, trades, and fills on Kalshi markets, including binary YES/NO contracts. This article covers what the websocket offers, how it differs from the REST read endpoints, and how traders leverage it for fast arbitrage and monitoring. If you’re evaluating Kalshi as a venue, understanding the websocket gives you a clearer view of latency, event timing, and the practical steps to subscribe to live data for your strategies.
What the kalshi websocket delivers in real time
Kalshi exposes a WebSocket feed that streams market activity as it happens. You can receive real-time updates on the order book, including best bid and best ask for YES and NO sides, as well as trades and fills. The websocket is designed to support fast reaction times for traders who rely on up-to-the-second data to assess edge conditions. Unlike static REST snapshots, the stream continuously pushes changes so you can track evolving spreads and liquidity on active markets.
How to use the websocket with Kalshi’s API
The WebSocket feed is part of Kalshi’s trade-api. You’ll typically authenticate with an API key and a signed timestamp, then subscribe to relevant market tickers to receive delta updates. The feed complements the REST read endpoints by providing low-latency updates on price, size, and event-driven moves. Practical use cases include monitoring changes in best YES/NO prices and detecting when intra-market arbitrage opportunities appear as the bid/ask evolves.
Practical considerations for traders
Latency matters when you’re chasing micro-arbitrage, so aim for sub-100 ms reaction times where possible. The websocket stream updates in near real-time, but you should account for network, client processing, and Kalshi’s own feed latency. Be mindful of rate limits and authentication requirements, and design your system to handle occasional disconnects or gaps in the stream without losing critical state.
KalshiArb and websocket data
KalshiArb relies on high-quality live data to scan for intra-market opportunities, including edge scenarios where bestAsk(YES) + bestAsk(NO) falls below $1.00. The Kalshi websocket provides the granularity needed to detect these moments promptly. By combining the feed with our non-custodial architecture, traders can monitor and react without exposing funds or private keys.
Get started with KalshiArb today
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FAQ
- What is the kalshi websocket used for?
- The kalshi websocket provides real-time market data such as order book updates, trades, and fills. It’s used to monitor edge conditions and react quickly to changes in YES/NO pricing on Kalshi markets.
- Do I need authentication to access the websocket?
- Yes. Access typically requires an API key and a signed timestamp. This ensures secure, authenticated streaming of market data for your account.
- How fast is the websocket compared to REST?
- The WebSocket feed is designed for low-latency, real-time updates, whereas REST endpoints provide periodic snapshots and broader data. Use the websocket for timely ticks and the REST API for structured, historical or batch data.