The NFL fired off another warning to prediction market platforms this month, demanding they pull event contracts the league considers threats to game integrity. The letter, sent in early September, follows an initial round of complaints the league lodged back in March 2026. It identifies four specific categories of contracts the NFL wants gone: those that could be manipulated by a single individual, contracts tied to inherently sensitive topics like injuries and player safety, predictions on officiating outcomes, and events where the result is essentially already known, such as draft selections.
Kalshi, Polymarket, and the integrity line
The two platforms most visibly in the crosshairs are Kalshi and Polymarket. Both operate prediction markets that allow users to trade contracts on real-world events, and both have listed sports-related markets that the NFL considers problematic.
Polymarket has already shown some willingness to bend. The platform withdrew a market on whether Patrick Mahomes would participate in Week 1, reportedly in response to input from the Commodity Futures Trading Commission.
The CFTC’s role in the fight
Throughout 2026, the league has been in regular dialogue with the CFTC, which regulates derivatives markets and has jurisdiction over event contracts. The commission has proposed rules that could ban or restrict sports event contracts tied to injuries or officiating while potentially allowing markets on more traditional game outcomes like final scores or win totals.
That distinction matters enormously for platforms like Kalshi, which has spent years fighting for the right to list event contracts and won a landmark court battle against the CFTC in 2024 over election prediction markets.
The NFL has also made clear that it has no intention of entering commercial partnerships with prediction market operators for the 2026 season. The league’s existing deals are with traditional sportsbooks like DraftKings and FanDuel.
What this means for prediction markets
The league has also implemented strict internal policies preventing NFL personnel from participating in or promoting prediction markets tied to league events.