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What is EventGraph?

EventGraph aggregates prediction market data from four platforms into a single, unified API. Whether you’re building trading tools, research dashboards, or analytics apps — you get clean, normalized data without integrating multiple platform APIs yourself.

Events & Markets

Browse thousands of active prediction markets across all platforms in one call

Search

Full-text search across events and markets by title or keyword

Cross-Platform Compare

Find the same event on multiple platforms with match scores and price gaps

Arbitrage Scanner

Live arbitrage opportunities with spread %, feasibility scores, and volume data

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Data sources

PlatformMarketsRefresh rate
Polymarket~3,000Every 15 min
Kalshi~800Every 15 min
Limitless~200Every 60 sec
OpinionTrade~150Every 15 min

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Base URL

All API requests use the v1 endpoint with an API key: 
https://app.eventgraph.ai/api/v1
Pass your key in the X-API-Key header. See authentication for details.