Polymarket Certifies Markets on Whether Patrick Mahomes Plays in Week 1

Two filings lodged with the CFTC on Tuesday turn individual NFL player availability into federally listed event contracts, trading from Thursday with no position limits. The legal argument for why they comply is sealed.

• QCX LLC, trading as Polymarket US, self-certified two new NFL product classes with the Commodity Futures Trading Commission on 25 August, days after Kalshi confirmed five MLB club deals it had been running unannounced: Player Participation Contracts and Starter Designation Contracts
• The named exemplar contracts are "Will Patrick Mahomes participate in the Kansas City Chiefs' Week 1 regular-season game?" and "Will Josh Allen be the starting quarterback for the Buffalo Bills in Week 1 of the 2026 NFL regular season?"
• The exchange says it will list them no earlier than 27 August, and intends to use them as the reference contracts for a wider class certification under a separate rule
• Each contract carries a $1.00 notional size, a $25,000 position accountability level and no position limits, with margin at 100% of the at-risk amount
• The compliance analysis, which is where the argument that these are lawful actually sits, was filed as a confidential attachment under a Freedom of Information Act treatment request, so the public filing asserts compliance without showing the reasoning

The Contracts Settle on Snaps Taken, Not on Injury Reports

QCX LLC d/b/a Polymarket US, a designated contract market registered with the CFTC, filed two self-certifications under 17 C.F.R. § 40.2(a) on 25 August, signed by Nick Rice, the exchange's head of markets. One covers NFL American Football Player Participation Contracts, coded APACNFL. The other covers NFL American Football Starter Designation Contracts, coded SDCNFL. Under self-certification, a designated contract market lists a product on its own certification that it complies with the Commodity Exchange Act, rather than waiting for the Commission to approve it.

Both filings say the exchange intends to list no earlier than 27 August. Both cite CFTC Staff Letter No. 26-22, issued on 24 July 2026, as the reason for submitting each product as a single specific event contract rather than as a broad template. Both also state that the exchange intends to rely on the product as the reference contract for a subsequent class certification under 17 C.F.R. § 40.2(d). In plain terms, these two named markets are the doorway to a whole category.

The terms are unusually precise about what does and does not settle a contract. A participation contract pays out if the named player takes part in at least one play, as recorded in the official gamebook and play-by-play records. The filing states explicitly that "pre-event injury reports, availability designations, active or inactive roster listings, projected or published lineups, and similar pre-event announcements are not determinative of the Contract Outcome". A starter designation contract pays out only if the player is listed at the specified position in the official gamebook starters listing published after the game, and the terms add that a listed player is treated as having started regardless of where they line up or take snaps, while an unlisted player has not started even if they appear for a kickoff or a punt. Depth charts, projected lineups, pre-game publications, media reports and coach announcements do not by themselves satisfy the condition, and later statistical corrections do not affect settlement.

Contract economics are light-touch. Notional size is $1.00, the minimum tick sits between $0.001 and $0.01, margin is 100% of the at-risk amount, and the position accountability level is $25,000 of notional exposure. The filings state that no position limits apply. The National Football League is the primary settlement source, with a secondary hierarchy running through ESPN, CBS Sports, Fox Sports, NBC Sports, the Associated Press, the Wall Street Journal, Reuters, Sports Reference, The Athletic, Sports Illustrated, BBC Sport, Yahoo Sports and USA Today Sports.

The eligibility section is where the exchange has done the most work. Barred from trading are players, coaches and staff of the participating clubs; anyone at a club or the league with authority over, or advance knowledge of, participation or availability decisions before they are officially published; club medical staff and athletic trainers; current and former employees of the settlement source with pre-publication access to the data; participants in any embargo or advance-access arrangement; the ultimate beneficial owners of entities able to influence the contract or its data; and the household members and immediate family of everyone in those categories. Accounts are closed to under-18s.

What is not published is the argument. Each certification encloses an Attachment B described as "a concise explanation and analysis demonstrating that the Product comply with the Commodity Exchange Act", and each was accompanied by a separate petition to the CFTC seeking confidential treatment under Regulation 145.9. Both letters also record that "the Exchange is not aware of any substantive opposing views regarding these Product".

Settling on the Gamebook Is a Serious Answer to the Obvious Objection

Take the design on its own terms and it is better thought through than the headline suggests. The single most dangerous feature of a player-availability market is that the thing being traded is a decision taken privately by a small number of identifiable people, usually a head coach and a medical staff, and disclosed on a schedule the league controls. A contract that settled on the injury report would be a market in the timing of a league announcement, which is about as clean an insider-information problem as derivatives design produces. By settling on the gamebook instead, and by stating in terms that availability designations and inactive lists are not determinative, Polymarket has moved the settlement trigger to an event that is public, simultaneous and observed by millions of people at once. The exclusion list does the rest of the work, and it is broader than the equivalent provisions in most state sportsbook rulebooks, reaching family members and former employees of data sources. None of this makes the underlying information asymmetry disappear. A club still knows on Friday what the market will only learn on Sunday. But it does mean the exchange has identified the right risk rather than waved at it.

No Position Limits Is the Number That Should Draw Scrutiny

The filings state plainly that no position limits apply, with a $25,000 accountability level as the only threshold. Accountability levels are not caps: they trigger a conversation with the exchange, not a stop. Against a market whose outcome turns on one person's fitness, that is a materially different risk profile from a regulated sportsbook, where player props typically carry hard maximum stakes precisely because the pool of people who can move the outcome is so small, and where regulators are actively reviewing whether props on individuals should exist at all. Nothing in the terms prevents a single well-capitalised participant from building a position of any size on whether a named quarterback takes a snap, and the exchange's own eligibility rules assume it can identify who is trading, which is a policing claim rather than a structural control. The gap between "we have prohibited the people who know" and "we can detect the people who know" is where every sports integrity failure of the last decade has lived.

The Sealed Attachment Is the Real Governance Story

Self-certification puts the burden of legal analysis on the exchange and gives the Commission a narrow window to object. That trade is defensible when the reasoning is on the record, because the market, the leagues, the states and Congress can all read it and respond. Here the reasoning is sealed. Attachment B, described in each letter as the concise explanation and analysis demonstrating compliance with the Act, went in under a confidentiality petition. That is the document in which an exchange would be expected to address the special rule in section 5c(c)(5)(C) of the Commodity Exchange Act, which lets the Commission review event contracts involving gaming and prohibit those it finds contrary to the public interest. What remains public is an assertion of compliance and a statement that the exchange knows of no substantive opposing views, filed in a year when the CFTC has been sued by and has sued state regulators over precisely this question, when Congress has been pressing the Commission on prediction markets and insider trading, and when the acting chairman's claim that 2,500 self-certifications went unopposed has itself become contested. An unopposed certification is not evidence of consensus when the document that would provoke opposition is not published.

The design here is careful and the disclosure is not. Polymarket has built a player-availability market that answers the integrity objection better than most people expected, and then filed the answer under seal.