The NFL has filed a 32-page amicus brief with the US Supreme Court in Flaherty v. KalshiEx, urging the court to revisit how sports event contracts are regulated. Former US attorney general William Barr worked on the filing.
The league argues that the CFTC and prediction-market operators have ignored calls to build safeguards into sports contracts, with up to $1 trillion in notional value riding on the derivatives market. Bets on a kicker's miss, the next penalty in a game or phrases pulled from broadcasts are unacceptable to the NFL, the brief says. 'It is unclear whether the commission has the resources to oversee so that prediction markets don't threaten the integrity of games.' Kalshi and Polymarket rejected the claims, saying both are developing monitoring systems and are open to dialogue.
NBA commissioner Adam Silver, speaking to CNBC from Macau, backed the league's concern about data integrity but came out for federal regulation, against the NFL's preference for state-level rules.
Seminole Tribe sues DraftKings
The Seminole Tribe of Florida filed a 72-page suit against DraftKings and its CEO Jason Robins in a Broward County court, arguing that the company's 'super app' — sportsbook, prediction markets and online casino in one — breaches the 2021 compact, costs Florida revenue and sidesteps the ban on college sports betting. DraftKings said its prediction platform operates under the federal Commodity Exchange Act.
Kalshi, meanwhile, announced partnerships with four tribes: three in California and one in Oklahoma.
