Polymarket vs Kalshi
The same question priced on both venues. We pair two markets only after checking that they settle on the same fact and the same day; wording that differs in one detail is not the same bet.
No checked pair is open right now. Pairs are added by hand once both markets are confirmed to settle on the same fact and day.
Runs on a blockchain, with a separate app for US customers. Outcomes are proposed and can be challenged through the UMA oracle. Volume is reported in US dollars.
A US exchange regulated by the CFTC. Outcomes are settled by Kalshi under each market’s rules. Volume is reported in contracts.