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Kalshi API Documentation

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Kalshi prediction markets API documentation. Use when building integrations with Kalshi's REST API or WebSocket streams for trading, market data, or portfolio management.

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Kalshi API Documentation

Complete API reference for Kalshi's prediction markets platform. Use this skill when:

  • Building trading bots or integrations with Kalshi
  • Working with market data, orders, or portfolio APIs
  • Implementing WebSocket connections for real-time data
  • Understanding authentication and rate limits

Documentation Structure

  • api-reference/ - Complete REST API endpoints organized by category:
    • api-keys/ - API key management
    • communications/ - RFQs and quotes
    • events/ - Event data and series
    • exchange/ - Exchange info, schedule, announcements
    • market/ - Market data, orderbooks, candlesticks
    • orders/ - Order placement and management
    • portfolio/ - Positions, fills, balance, settlements
    • multivariate/ - Multi-leg market operations
  • getting_started/ - Quickstart guides and concepts
  • websockets/ - WebSocket API for real-time streaming
  • asyncapi.yaml - WebSocket API schema (AsyncAPI format)
  • changelog.md - API changes and updates

Key Files

  • getting_started/​api_keys.md - API key setup and authentication
  • getting_started/​quick_start_market_data.md - Fetching market data
  • getting_started/​quick_start_create_order.md - Placing orders
  • getting_started/​quick_start_websockets.md - Real-time streaming
  • getting_started/​rate_limits.md - Rate limiting details
  • api-reference/​portfolio/ - Trading and position management
  • api-reference/​market/ - Market data endpoints

Usage Notes

  • API base URL: https://api.kalshi.com/trade-api/v2
  • WebSocket URL: wss://api.kalshi.com/​trade-api/​ws/​v2
  • Demo environment available at https://demo-api.kalshi.co
  • All trading endpoints require authentication via API key
  • Rate limits apply - see getting_started/​rate_limits.md