Parlays go live in Polymarket US beta

• Polymarket US processed its first parlay trade on August 5, 2026, opening a beta test of contracts it self-certified with the CFTC as Combinatorial Athletic Outcome Contracts (CAOCs).
• The beta has generated $7.4 million in volume across 16,173 trades, most of it in the past week.
• Test parlays are capped at 10 legs, versus the 30-plus leg trades Kalshi supports.

Polymarket’s regulated US exchange has begun beta testing parlay contracts, three months after self-certifying the product with the Commodity Futures Trading Commission (CFTC) on May 20.

The exchange processed its first parlay trade on August 5, with the test environment generating $7.4 million in volume across 16,173 trades, though the feature remains unavailable through Polymarket’s app.

Ten-leg limit

The beta launch follows Polymarket US’s self-certification of Combinatorial Athletic Outcome Contracts (CAOCs) with the CFTC on May 20. The contracts were not made available to the public immediately after that filing.

Roughly ten weeks later, the exchange processed its first parlay trade on August 5. Most of the recorded $7.4 million in volume, or $928,093 in taker-side stakes, took place in the days since, according to the exchange’s own trade data.

The product remains limited for now. Parlays are not yet available through the Polymarket US app, and the company has not widely launched a desktop site. The recorded trades occurred entirely as tests.

According to Polymarket US API documentation, test users can currently combine as many as 10 legs in a single parlay, a tighter format than the 30-plus leg trades Kalshi supports.

Pricing by request

This is where the product diverges structurally from a standard sportsbook parlay.

Polymarket prices combinations through a request-for-quote (RFQ) system rather than multiplying fixed odds across legs. A trader submits a request specifying the combination, and participating market makers must respond with a price within a set window.

The trader then accepts or declines the best available offer. Casual users generally access only the “yes” side of a parlay through the standard interface, with more granular pricing control reserved for those trading through the API.

For operators watching from the sportsbook side, the difference matters. A traditional parlay generates its margin from the operator’s own book, with the house absorbing correlation risk across legs.

An RFQ-priced exchange contract shifts that risk onto competing market makers, who must price correlated outcomes without the promotional tools a sportsbook uses to manage its own exposure.

It also puts CAOCs inside a debate the regulator has already opened: the CFTC has warned prediction markets that sportsbook-style odds could mislead traders and breach federal rules, scrutiny that will likely extend to how RFQ-priced parlays are quoted to retail users.

Parlay race heats up

Polymarket’s blockchain-based offshore platform, which blocks US IP addresses, began offering parlays on June 10, at the start of the FIFA World Cup, well ahead of its domestic exchange.

In the gap between self-certification and the US launch, Kalshi’s own parlay volume grew from $4.77 billion in May to $13.78 billion in July, a run rate it looks on course to sustain into August despite a lighter sporting calendar.

Kalshi is now expected to add maker fees to its parlay contracts around August 20, following the exchange’s existing fee schedule, on which maker fees typically run a quarter of taker fees.

The change comes as Kalshi has already made $25 million in parlay taker fees in the first 16 days of August alone, and as the exchange explores an IPO on the back of revenue that has roughly tripled to $2 billion.

The scale of those figures shows why parlays have become a priority for both exchanges. If Polymarket US can move its beta into full production before football season, the two platforms will compete directly on parlay liquidity and pricing speed rather than product availability.

The open question for sportsbook operators and suppliers is whether RFQ-based pricing proves sharp enough to pull parlay bettors away from fixed-odds books, or whether it stays a niche complement to traditional same-game parlays.