About ArbEx
Prediction markets are spread across separate venues. The same outcome can trade at different prices on Kalshi, Polymarket, Polymarket US, Gemini, and elsewhere, often under slightly different rules and with no shared order book.
ArbEx brings those markets into one place.
The algorithm matches contracts that resolve on the same outcome, combines their pricing and liquidity, and shows where the markets disagree. Each match also includes the underlying contract terms so users can see where two markets may differ before putting on a trade.
ArbEx was built for traders. Prices are based on executable bids and offers, edge is shown net of fees, and the tools are designed around the way a professional desk would view markets.
Where we're headed
Today, traders must fund separate accounts, monitor separate books, and post collateral independently at each venue.
We believe those markets should eventually trade through a single interface, with orders routed to the best available price and offsetting positions recognized together for lower margin requirements.
ArbEx is the first step: a common view of pricing, liquidity, and contract structure across prediction markets. Over time, ArbEx aims to become the layer through which those markets are accessed and traded.