Polymarket US launched its long-awaited Combos feature Wednesday, bringing parlay-style sports contracts to its regulated U.S. prediction market platform just weeks before the start of the NFL season.
The new feature is prominently displayed in the Polymarket US app through a “Build a Combo” button that lets users combine multiple sports contracts into a single trade. At launch, the builder includes markets across MLB, NFL, tennis, table tennis, UFC, soccer, esports, WNBA, college football, baseball, cricket and darts.
Users can combine contracts from different games and sports, as well as different market types, including winners, spreads and totals. The app then prices the multi-leg position and displays a combined payout before the trade is submitted.
The consumer rollout follows weeks of behind-the-scenes testing and earlier regulatory filings outlining Polymarket US’s plans for combination sports contracts. Polymarket’s international platform also offers Combos, but Wednesday’s launch makes the feature available directly to customers of the company’s CFTC-regulated U.S. exchange.
Users can build cross-sport, multi-leg trades
Polymarket US Combos function much like parlays at a sportsbook, allowing users to select between two and 10 legs and combine them into a single position, according to the exchange’s documentation. Every leg must resolve in the user’s favor for the Combo to pay out.
The feature is designed to make building those combinations straightforward. I was able to quickly create a three-leg, cross-sport Combo combining two MLB contracts with an NFL pre-season game winner. A $10 position on that combination showed a potential payout of $106.51, or 10.65 times the amount traded.
Behind the interface, Polymarket US uses a request-for-quote system to price user-created combinations. Rather than relying on an existing order book for every possible multi-leg permutation, the exchange sends the requested Combo to market makers, which can compete to provide a price.
That structure allows Polymarket US to support an enormous number of potential combinations without having to list each one as a standalone market in advance. The exchange’s previously published documentation says Combos can include contracts from different events, including across multiple sports.
Launch follows quiet beta testing
Polymarket US had been laying the groundwork for Combos for months before making them available in the app. Its exchange operator, QCX, self-certified a Combinatoric Athletic Outcome Contract with the Commodity Futures Trading Commission on May 20, establishing the contract structure that underpins the new feature.
Testing began well before Wednesday’s consumer rollout. InGame first reported that Polymarket US processed its first Combo trade on Aug. 5, even though users still could not build the contracts through the regular app at the time.
By the time InGame identified the testing, the exchange had already processed $7.4 million in Combo trading volume across 16,173 trades, representing $928,093 in taker-side stakes. The site said most of that activity had occurred in the several days immediately preceding its report.
Combos launch as NFL trading accelerates
Polymarket US is adding Combos as multi-leg products become an increasingly important source of activity for sports-focused prediction markets. Kalshi‘s parlay-style Combo volume climbed from $4.77 billion in May to $13.78 billion in July, according to InGame.
For comparison, Kalshi generated $41.12 billion in total notional volume during July, according to DeFi Rate’s volume tracker, putting the scale of its Combo activity at roughly one-third of its overall monthly trading.
The timing of Polymarket US’s launch also puts the feature in place as football trading begins to accelerate. DeFi Rate reported that NFL prediction market volume across Kalshi, Polymarket Global and Polymarket US reached $167.8 million in the week ending Aug. 16, up more than 324% from the previous week. Polymarket US accounted for $33.5 million of that activity before Combos were available to its regular app users.
With the NFL regular season weeks away, Combos give Polymarket US another way to capture that growing sports activity by letting customers turn several individual contract selections into a single, potentially higher-paying trade.
