Official docs
The venue’s own market lookup, rules, and fee metadata.
Prediction market APIs compared
Separate an official market read from a normalized feed, and from a client that can also place an order. An API is an interface, not a forecast.
A normalized read
One query across venues. A read of prices is not a prediction.
Orders
Some clients can also place an order or touch an account. That is a different permission.
Read official Kalshi markets, rules, and lifecycle
Kalshi API
Official developer API documentation for Kalshi market lookup, rules, lifecycle timestamps and series metadata.
Read official Polymarket markets, state, and fees
Polymarket API
Official Polymarket developer documentation for market discovery, market state and fee metadata.
Read normalized markets across Polymarket, Kalshi, and Limitless
Assymetrix Data API
A normalized data API for querying markets, events, trades, historical candles and order-book depth across Polymarket, Kalshi and Limitless.
Read discovery and price history, including MCP
PolyRouter
Unified prediction-market data API with market discovery, price history and an MCP integration.
Read historical books, streams, and wallets
Predexon
Prediction-market data API with historical order books, real-time streams, wallet analytics and AI-agent access.
Read prices, resolutions, and a whale feed
CoinRithm Prediction Markets API
A cross-venue JSON API for prediction-market events, prices, resolved markets, calibration data and a whale-activity feed.
Read Manifold. Trades use mana, not cash
Manifold API and Data
Official alpha API for Manifold market data and authenticated account actions, plus historical datasets for personal and non-commercial research. Manifold markets use mana, a play-money currency that cannot be converted to cash. The public bulk dumps were last updated July 6, 2024.
Read data, and trade where the SDK supports it
pmxt
An open-source unified API and SDK for prediction-market discovery, data and supported trading across venues including Polymarket, Kalshi and Limitless, with Python, TypeScript, CLI and MCP interfaces.
Browse without a wallet. Trading needs credentials
Polymarket CLI
Experimental Polymarket-published Rust CLI for market and order-book browsing, JSON output, positions and orders. Most research commands need no wallet; trading and account commands require wallet credentials.
Read streams and run order workflows
Synpath
A unified prediction-market developer toolkit for market data, streams and order workflows across multiple venues.
Read Kalshi data and run account operations
Kalshi Python SDK by TexasCoding
An open-source Python client for Kalshi API workflows, including market data and account operations.
The description, AI label, and price label come from the published profile. They are not a new test.