WebSocket API - API Documentation

Use the dedicated Trade API WebSocket hosts for new integrations:

Environment	WebSocket URL	Shared host, also supported
Production	`wss://external-api-ws.kalshi.com/trade-api/ws/v2`	`wss://api.elections.kalshi.com/trade-api/ws/v2`
Demo	`wss://external-api-ws.demo.kalshi.co/trade-api/ws/v2`	`wss://demo-api.kalshi.co/trade-api/ws/v2`

WebSocket connections use the same API key authentication and signing path as before. Only the hostname changes for the dedicated Trade API path.

For connection and subscription examples, see Quick Start: WebSockets.
For all REST and WebSocket base URLs, see API Environments and Endpoints.
To generate clients or inspect channel payloads directly, download the AsyncAPI specification.
For detailed CF Benchmarks channel usage (cfbenchmarks_value), see CF Benchmarks Value Feed.