The NFL has drawn a line. This week the league sent formal letters to Kalshi, Polymarket, and other prediction market platforms demanding they stop offering contracts on what it calls “objectionable bets” — trading on injuries, officiating calls, broadcast announcements, and pick-by-pick draft predictions. Events, in the NFL’s view, that are either easy to manipulate or simply knowable in advance by the people closest to them.
The move escalates a confrontation between the world’s most valuable sports league and the fast-growing prediction market industry that has turned game outcomes — and everything around them — into tradeable assets.
The NFL’s Argument: Integrity Has a Price, and It’s Paid in Inside Information
The league’s position, laid out in letters sent to the platforms this week, is straightforward: contracts on officiating, player injuries, and draft-night declarations are not prediction markets playing fair. They are information markets, and the information sits in the hands of team executives, coaches, referees, and broadcast producers long before the public does.
Kalshi and Polymarket have operated in a legal gray zone for months. Their legal argument hinges on a distinction the platforms have repeated like a mantra: their customers are not placing bets — they are buying contracts on the outcome of real-world events. That framing keeps them outside the scope of most state sports betting laws. It does not, the NFL is now arguing, keep them outside the reach of integrity rules.
The platforms announced earlier this month that they would take steps to prevent insider trading on their own. Kalshi and Polymarket both said they were introducing restrictions on trading in the days leading up to events where inside information could be weaponized. The NFL’s response was essentially: that is not enough. Take the contracts off the board entirely.
Washington Is Already Moving
The NFL is not the only one pushing back. A bipartisan Senate bill introduced last week takes dead aim at the prediction market industry’s legal shelter. The legislation, which would amend the Commodity Exchange Act, would ban prediction market platforms regulated by the Commodity Futures Trading Commission — meaning Kalshi, at minimum — from offering contracts that mimic sports betting.
The timing is not accidental. Prediction markets have grown from a niche trading instrument into a genuine financial ecosystem. Billions of dollars in contracts have traded on election outcomes, macroeconomic data, and — increasingly — NFL games, player injuries, and draft selections. The volume has drawn the attention of both the leagues that create the underlying events and the regulators who oversee the platforms that trade on them.
The bill’s sponsors argue that prediction markets are exploiting a regulatory gap: they are functioning like sportsbooks but operating under CFTC oversight designed for commodity futures, not sporting events. Closing that gap is the bill’s stated purpose. For the NFL, it is a welcome push from a direction the league could not influence on its own.
The Platforms’ Dilemma
Kalshi and Polymarket have not issued formal responses to the NFL’s letters. But their positions are not hard to infer. Prediction markets survive on the breadth of what they cover. If every sports league can send a letter demanding specific contracts be removed — and Congress can amend the law to restrict trading on sporting events — the industry’s growth story falls apart. Football is not the whole market, but it is a large and deeply watched slice of it.
The platforms have a counter-argument that has found sympathy in some legal circles: prediction markets are, in fact, better at detecting real information than any internal integrity process the leagues have devised. When a player’s injury status is widely known by people inside the organization, a prediction market will reflect that information faster and more accurately than any official announcement. Removing that mechanism does not protect integrity. It just makes the information harder to see.
That argument has not moved the NFL. The league’s letters made no reference to the informational value of prediction markets. They focused entirely on one risk: that the people who know things first are the ones most likely to profit from them. That, in the NFL’s view, is not a market signal. It is just insider trading with better branding.
For now, the NFL is waiting. The platforms are considering. And a Senate bill that could reshape the industry sits in committee, waiting for a markup vote that its sponsors expect to be close.