Guides / Platform

Polymarket ↔ Kalshi Arbitrage Spreads

Polymarket and Kalshi both price prediction markets on the same real-world events, but not always at the same probability. ProbSights matches equivalent events across the two venues and surfaces the live spread.

Why spreads happen

• Different liquidity depth per venue
• Different user bases and flow
• Settlement/resolution timing differences

See it live on the arbitrage page, or query spreads via the API on the Trader plan.

Related

• Prediction market arbitrage scanner
• How prediction market arbitrage works

Related guides

• Cross-Venue Prediction Market Data API
• Kalshi Historical Data API — Orderbook & Trade History
• Kalshi Whale Trade Tracker
• Polymarket CLOB Historical Data

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