Polymarket US starts testing parlay bets before a wider rollout

Polymarket US, the regulated prediction-market platform in the United States, has begun testing parlay bets, a product that is not yet generally available to users. For high-risk payment and platform operators, the point is simple: the company is still in rollout mode, but the early volume suggests it is preparing to open the product more broadly.

1. Polymarket US filed its “Athletic Outcome Combinatorial Contracts” with the Commodity Futures Trading Commission (CFTC) in May, which is the company’s technical name for parlay bets. The product did not go live on the U.S. exchange until ten weeks later.
2. In the meantime, Polymarket’s international version, which runs on blockchain and blocks access from U.S. IP addresses, had already offered parlay bets since 10 June, when the FIFA World Cup began. While Polymarket US was waiting, parlay volume on Kalshi, Polymarket’s main U.S. competitor, rose from $4.770 billion in May to $13.780 billion in July. August is expected to end at similar levels, even with a lighter sports calendar.
3. The first parlay trade on Polymarket US was recorded on 5 August, according to the exchange’s own data. Since then, cumulative volume in the product has reached $7.4 million, including $928,093 in bets placed by market takers across 16,173 trades. Most of that activity came over the weekend before this note.
4. That test volume outpaced what Kalshi recorded in the first days after launching its own parlay product to all users in its app. On paper, that is not a bad start; in practice, Polymarket US is still running this as internal testing, not a public launch.
5. The parlay option still does not appear in the Polymarket US mobile app, and the platform does not yet have a desktop version either. According to Polymarket US API documentation, the product remains in beta and allows up to ten legs per bet, well below Kalshi, where parlays with more than thirty legs have been recorded.

Polymarket prices parlays through a request-for-quote process: when a user builds a combination, the platform asks market makers to quote a price for that bet, they respond within a defined window, and the user can accept or reject the best available offer. That matters for payment and risk teams because it shows the product is being opened with controlled pricing and controlled access, not a full-flood release.