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