Kalshi API

Trade and query the first CFTC-regulated prediction market exchange. Binary yes/no contracts on real-world events priced 1-99 cents.

Base URL: https://external-api.kalshi.com/trade-api/v2 Demo URL: https://external-api.demo.kalshi.co/trade-api/v2

Get your API key at https://kalshi.com/account/api-keys (Premier or Market Maker tier required)

Key Concepts

Hierarchy: Series > Events > Markets

• Series — recurring event templates (e.g., "Monthly Jobs Report", "Weekly Jobless Claims")
• Events — specific instances within a series (e.g., "May 2026 Jobs Report")
• Markets — individual binary outcomes within an event (e.g., "Will jobs added be above 200k?")

Binary Contract Pricing