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Cross-Venue Prediction Market Data API

ProbSights indexes Kalshi and Polymarket under one normalized schema — search, historical orderbook/trade data, arbitrage spreads, and whale trades all queryable the same way regardless of which venue a market lives on.

What's covered

• Live market search across both venues
• Historical orderbook + trade data
• Cross-venue arbitrage spreads (live scanner)
• Whale trade tracking (live view)

Related

• Polymarket + Kalshi historical data
• Polymarket ↔ Kalshi arbitrage

Related guides

• Kalshi Historical Data API — Orderbook & Trade History
• Kalshi Whale Trade Tracker
• Polymarket CLOB Historical Data
• Polymarket Gamma API + Historical Data

Data from Kalshi and Polymarket. Search live · API docs · Pricing