Kalshi API

Kalshi API gives developers programmatic access to the Kalshi Exchange for real-time market data and trade execution. It serves financial institutions, DeFi developers, and analytics teams that need direct access to Kalshi's markets for trading and data analysis. The API covers both event-contract markets and perpetual futures, with REST, WebSocket, and FIX protocols for historical data retrieval and live streaming of market updates.

The API ships with comprehensive documentation, downloadable OpenAPI and AsyncAPI specifications, and a demo environment for safe testing before going live. Developers generate and manage their own API credentials to authenticate requests, then place a first call straight from the quick start guides. Separate OpenAPI and AsyncAPI specs cover the event-contract and perpetual futures endpoints for REST and WebSocket integration.

What sets Kalshi API apart is its access to regulated, event-based markets, letting developers build applications that trade on real-world outcomes. It combines prediction market mechanics with exchange-grade infrastructure, which distinguishes it from traditional financial APIs. A detailed changelog and glossary keep developers current on API changes and the domain-specific terms used across the exchange.

To get started, developers make their first API call, generate credentials, and test their integration against the demo environment. REST, WebSocket, and FIX support keeps the API flexible across trading automation, analytics, and data workflows. For teams new to prediction markets, Kalshi also provides educational resources and tutorials.