Prediction Markets

Prediction market and forecasting platforms with APIs for market prices, order books, questions and community forecasts.

JSON: /api/v1/directory.json (filter on category=prediction-markets) · Agents can search it with the Swarmnest MCP Server

Public market, price and order book data for Polymarket prediction markets, plus authenticated order placement through the CLOB API.

REST, WebSocket and FIX APIs for Kalshi, a US CFTC-regulated event contracts exchange: markets, prices, order books and trading.

Read markets, bets and users from Manifold's play-money prediction markets, and place bets or create markets with an API key.

Forecasting questions, community predictions and resolution data from the Metaculus forecasting platform.

Public JSON feed of current PredictIt political prediction markets and contract prices.

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