Kalshi API: pricing and features

Prediction-market developer API

Kalshi's API gives developers market-data and trade-execution access to its exchange. The current documentation separates Predictions APIs for event contracts from Perps APIs for perpetual futures.

This is a developer connection to Kalshi, not a retail prop-account integration. Regional eligibility and product-specific permission need checking before any authenticated trading.

Vendor-source profile · Sources read 18 October 2026 · No rating assigned

Visit Kalshi API official site

Kalshi API pricing

The published API introduction does not list a separate API subscription price. Exchange trading fees, rate-limit tiers and access conditions must be checked in the current developer and exchange terms.

Developer API access

See vendor pricing

Developer agreement and account access apply

REST, WebSocket and FIX; check current rate limits

Demo environment

See vendor terms

Separate testing environment

Use demo credentials and endpoints rather than live funds

Prices and availability can change. Check the vendor checkout and terms before paying. Source: official pricing.

Confirm access to the specific Kalshi product in your location. API documentation is not worldwide trading permission.

Who Kalshi API suits

For custom market-data and execution code

Fits developers who can manage authentication, exchange state, rate limits and order risk.

For no-code funded account copying

Not a Tradovate, Rithmic or MetaTrader copier. The documented APIs connect to Kalshi products.

What Kalshi API includes

The official Kalshi API documentation describes these functions. Plan and connection limits apply.

Event-contract APIs: Predictions documentation lists REST, WebSocket and FIX interfaces for event-contract markets.
Market data and execution: The introduction identifies real-time market data and trade execution as API functions.
Demo environment: A separate demo environment is provided for building and testing.
API credentials and limits: Documentation covers API key management and tiered rate limits with token budgets and bursting.
Machine-readable specifications: OpenAPI and AsyncAPI specifications are offered for Predictions and Perps interfaces.

Platforms and access

Predictions and Perps are distinct API families. Do not assume identical eligibility, endpoints or risk rules across products.

Kalshi Predictions REST APIKalshi Predictions WebSocketKalshi FIX interfacesSeparate Kalshi Perps APIsKalshi demo environment

Check platform and connection requirements ↗

Checks before use

This is a developer connection to Kalshi, not a retail prop-account integration. Regional eligibility and product-specific permission need checking before any authenticated trading.

Jurisdiction and product eligibility. Confirm access to the specific Kalshi product in your location. API documentation is not worldwide trading permission.
Key protection. Store private credentials outside source code and logs. Separate demo and production configuration and limit access to trading keys.
Rate limits and order recovery. Design for throttling, dropped streams and duplicate submissions. Reconcile orders and positions before retrying a trade.
Fees and contracts. Review the developer agreement, exchange fee schedule and contract settlement definitions before enabling execution.

Compare tools before choosing

For more tools, browse the trading tools directory.

Kalshi API questions

Is this an API for my funded futures account?

No. It connects to Kalshi exchange products, not a retail funded account at a separate firm.

Can code be tested without live trading?

The documentation provides a demo environment. Use its separate credentials and endpoints.

Which interfaces are listed?

REST, WebSocket and FIX, with separate Predictions and Perps API families.

Is API use priced on the introduction page?

No separate API subscription price is established by that page. Check current access terms, rate limits and exchange fees.

Sources and disclosure

Source record: 18 October 2026. Vendor documentation supports product claims, not independent performance validation. This profile links directly to official vendor pages. No product rating or hands-on testing is claimed.

Official pricing and product details · Read 2026-10-18