Skip to main content

REST API Tools

Tools and wrappers for the Kalshi REST Trading API. Place orders, read markets, and manage portfolios programmatically.

Overview

REST API tools for Kalshi give developers programmatic access to the exchange's event contract markets, enabling automated trading, data retrieval, and portfolio management without manual interaction with the web interface. These tools communicate with Kalshi's Trading API over standard HTTPS, returning structured data about markets, positions, orders, and account balances denominated in USD.

Builders using REST API tools on Kalshi range from individual algorithmic traders writing personal bots to quantitative research teams pulling historical and live market data for modeling. Because Kalshi is a CFTC-regulated exchange, any tool accessing the API must authenticate with valid credentials and operate within the platform's rate limits and trading rules.

This sub-category lists client libraries, SDKs, and third-party data APIs that wrap or extend Kalshi's REST endpoints. Some are officially maintained by Kalshi, others are open-source community projects, and some are independent data providers that aggregate Kalshi alongside other prediction market platforms.

  • Check whether the tool is officially maintained by Kalshi or community-supported, since official SDKs are more likely to stay in sync with API version changes.
  • Confirm the tool supports the specific endpoints you need — order placement, market data retrieval, and account balance queries are not always all included in third-party wrappers.
  • Evaluate authentication handling to ensure the library manages API key storage and token refresh in a way that fits your security requirements.
  • Review rate-limit management features, as tools that handle back-off and retry logic automatically reduce the risk of your integration being throttled.
  • If you need data across multiple prediction market platforms and not just Kalshi, prefer aggregator APIs that explicitly list Kalshi as a supported source.
  • Assess how actively the repository or service is maintained by checking recent commits, open issues, and release history before building a production integration on top of it.

Tools in REST API Tools

Verified

Kalshi SDKs (Official)

Active

Official Kalshi Trading API SDKs and developer documentation.

rest-apiwebsocket-apifix-api+1
0
6 views

kalshi-python

Active

Python client library for the Kalshi Trading API (PyPI).

python-sdkrest-apiopen-source
0
4 views

FinFeed Prediction Markets API

Active

API for prediction-market data including Kalshi.

rest-api
0
6 views

Frequently Asked Questions

What can I do with Kalshi's REST API?
Kalshi's REST API lets you retrieve real-time and historical market data, submit and cancel orders, check account balances, and view open positions on event contracts. All account values and settlement amounts are in USD. The REST API is one of three interfaces Kalshi offers, alongside WebSocket for streaming data and FIX for institutional-grade order routing.
Is there an official Python library for the Kalshi REST API?
Yes. Kalshi publishes official SDKs with accompanying developer documentation, and there is also a community-maintained Python client library available on PyPI specifically for the Kalshi Trading API. Both options expose REST endpoints, though the official SDKs tend to be updated first when Kalshi makes API changes.
Can I access Kalshi market data through a third-party API instead of connecting directly?
Yes. Some independent data providers offer prediction market APIs that include Kalshi as one of their supported sources, which can be convenient if you want normalized data across multiple platforms in a single feed. These third-party services handle the direct connection to Kalshi on your behalf and typically expose their own REST interface for your application to query.
Do I need special regulatory approval to use the Kalshi REST API for automated trading?
Kalshi is a CFTC-regulated exchange, so you must agree to its terms of service and be an eligible account holder to trade. Automated trading via the API is permitted under standard account agreements, but you are responsible for ensuring your trading activity complies with applicable regulations and Kalshi's own API usage policies.