NFL integrity brief targets kicker contracts and penalty markets

William Barr's name on the cover page is the part that gets attention. The argument inside is more specific, and more damaging to Kalshi's position, than the byline suggests.

The NFL's amicus brief filed with the Supreme Court in Flaherty v. KalshiEx does not oppose prediction markets as a category. It opposes particular contracts: whether a kicker will miss a field goal, what the next penalty in a given game will be, phrases mentioned during a broadcast. The league's argument is that these are not event contracts in any financial sense — they are minute-by-minute in-play wagers on outcomes that individual players can directly influence, dressed in swap terminology.

That specificity matters legally. The CFTC's proposed rule folds event contracts "based on sports, politics, cultural, and weather-related events" into its swap jurisdiction in a single clause. The NFL is asking the Court to notice that a weather derivative and a field goal miss are not the same instrument, and that the Commission's framework does not distinguish between them. Whether the CFTC has the regulatory capacity to police the difference — real-time market surveillance tied to on-field events — is a question the brief raises and does not answer, because the NFL's point is that the CFTC has not answered it either.

Kalshi's response that it is "actively policing sports-related markets" and has partnerships with the NHL and MLB is a commercial claim, not a regulatory one. Partnership agreements do not create surveillance obligations with federal enforcement teeth. The brief is targeting the framework, and a partnership announcement does not close that gap.

The integrity argument has always been the NFL's strongest ground here, stronger than the states' rights framing that 39 attorneys general have been pressing. State attorneys general are arguing about jurisdictional allocation — who gets to tax and license. The NFL is arguing about the instrument itself, and about whether a market where a player's deliberate action can move the contract price belongs in the same regulatory category as a soybean future. Those are different claims, and the second one is harder to dismiss.

The NBA's Adam Silver, speaking from Macau, flagged data rights alongside integrity — a reminder that the leagues have economic interests in how sports event contracts are structured, not just principled objections to them. That dual motive gives Kalshi room to characterize the brief as self-interested. But the field goal example does not become less legally precise because the NFL profits from resolving it a certain way.

The Court has three circuits that have now ruled in conflicting directions on whether sports event contracts are swaps and whether CEA preemption applies. Adding a 32-page brief from the NFL with a former Attorney General's signature does not resolve that split, but it changes the weight distribution of the record the justices will read. The Commission arrives at the Supreme Court having issued an interim rule and a proposed rule, able to show rulemaking underway. The NFL arrives having named the specific contracts it finds objectionable. The question of whether the CFTC's framework can actually address those specific contracts — at the instrument level, not the category level — is the one neither party has yet answered for the Court.