Polymarket US Tests 10-Leg Combos After $7.4M Beta Start
The regulated exchange has started putting multi-leg sports contracts through a live beta. Test trading has already produced $7.4 million in volume across 16,173 transactions.
The first US combo trade was recorded on August 5. Activity remained limited at first, before accelerating later in the test period. Since then, the contracts have generated $7.4 million in total volume, including about $928,000 in taker-side stakes. Most of the activity arrived during the final few days covered by the data.
This is still a controlled rollout. Users cannot currently create combos through the standard Polymarket US app, while a full desktop product has yet to receive a broad release. The existing transactions therefore reflect beta activity rather than a public launch.
CFTC Filing Came Months Earlier
Polymarket US prepared the regulatory groundwork in May. The exchange submitted a product self-certification to the Commodity Futures Trading Commission for Combinatorial Athletic Outcome Contracts, or CAOCs, on May 20.
The product then spent several weeks off the US market. Polymarket’s international platform introduced multi-leg contracts in June, while its regulated American exchange continued preparing the domestic version.
The US exchange itself operates as a CFTC-designated contract market under QCX LLC. The CFTC designated QCX in July 2025, and it now does business as Polymarket US.
Combos Use a Quote-Based Pricing System
Polymarket’s current documentation allows between two and 10 legs in one combo. Each leg links an existing market with a buy or sell position.
Pricing is handled largely through a request-for-quote system. A trader submits the proposed combination, and market makers return prices. The system then selects between the available quotes before execution.
That setup differs from a traditional sportsbook parlay, where the operator normally displays the price directly. It also makes liquidity providers central to how quickly and efficiently these contracts can be priced.
Kalshi Has Already Built Scale in Multi-Leg Trading
Polymarket is entering a segment where Kalshi has had months to build volume. Kalshi’s parlay trading rose from $4.77 billion in May to $13.78 billion in July, according to InGame. The publication also estimates that the platform collected $25 million in parlay taker fees during the first 16 days of August. Kalshi is also preparing to charge maker fees on the product after previously allowing some liquidity providers to trade without them and, in some cases, offering incentives.
For Polymarket, the next test is less about whether users will trade multi-leg contracts at all. Kalshi has already demonstrated that demand. The harder task will be turning a small beta into a liquid public product before the US football calendar reaches its busiest period.