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David Purdum of ESPN reports that the NFL sent out letters to various prediction markets on Sunday requesting that they refrain from offering certain trades that can easily be manipulated beforehand.
These include such things as what announcers say during broadcasts, which celebrities attend games and the upcoming draft.
Purdum notes that both Kalshi and Polymarket were sent the letters.
Much of the NFL’s concern mirrors long-standing restrictions imposed on traditional sportsbooks, particularly around novelty and prop-style wagers vulnerable to insider influence.
Such prop bets are still available from offshore sportsbooks like BetOnline, though that company monitors closely any patterns that could suggest suspicious betting patterns and regularly shuts off offerings when detected.
"Some people are going to have that information ... that they can then share," NFL executive vice president Jeff Miller told ESPN. "We're trying to stay as far as we can from some of those sorts of inside information wagers that could exist in this space."
Miller said the letter follows months of conversations between the NFL and the Commodity Futures Trading Commission (CFTC), the federal regulator that oversees prediction markets.
The CFTC and Major League Baseball will now share information and meet regularly to discuss types of markets thought to be vulnerable to manipulation.
The National Collegiate Athletic Association (NCAA) has also been in communication with Kalshi pertaining to some of its offerings.
More specifically, the NCAA demanded Kalshi stop using its trademarked terms like “March Madness,” “Final Four,” and similar terms, for which Kalshi has complied.
The organization previously attempted to block DraftKings from using those same terms, arguing they created a false association between college athletics and gambling. However, a federal judge rejected claims of irreparable harm, and DraftKings has indicated it will continue using the branding.
DraftKings—alongside FanDuel—remains a dominant force in the U.S. regulated sportsbook market. The company formally entered the prediction markets space in December 2025 with the launch of DraftKings Predictions, a standalone app and web platform.
- Chris Costigan, Gambling911.com Publisher
