Kalshi FIX API Specifications
Version: 1.0.16
Last Updated: 2025-11-30
Introduction
FIX (Financial Information eXchange) is a standard protocol that can be used to enter orders, submit cancel requests, and receive fills. Kalshi’s implementation follows the standards as closely as possible, with any divergences highlighted in this documentation. Please contact institutional@kalshi.com to inquire about FIX access.FIX Dictionary Download
Need a machine-readable view of the Kalshi-specific FIX tags and messages? Download the XML dictionary and import it into your FIX tooling of choice:Key Features
Session Management
Logon, logout, heartbeat, and session control messages
Order Entry
Submit, modify, and cancel orders through standard FIX messages
Market Settlement
Market settlement and payout updates
RFQ Support
Request for Quote functionality for market makers
Drop Copy
Separate session for order event recovery
Order Groups
Automatic order cancellation with contracts limits