Kalshi vs. Missouri: Federal lawsuit challenges state sports betting rules

Kalshi filed a federal lawsuit against the State of Missouri on October 30, challenging the state's authority to regulate its prediction market platform. The legal action seeks to block recent rules issued by Missouri Attorney General Catherine Hanaway, who ordered the company to stop offering sports event contracts.

Hanaway sent a cease and desist order to Kalshi, arguing the company violates a state constitutional amendment. That amendment places sports betting under state regulatory control. The lawsuit counters that Missouri lacks the power to dictate how prediction markets operate. The company contends that only the Commodity Futures Trading Commission, a federal agency, holds regulatory jurisdiction over its business.

The legal filing argues that applying state gambling laws to Kalshi intrudes on a field Congress reserved for federal oversight. The document warns that conflicting rules would force Kalshi to choose between violating federal law or facing criminal prosecution and civil enforcement in Missouri.

Hanaway's office responded to the suit in a statement. The GOP official said she will enforce the law and believes the courts will allow her to do so. Her office argued that if a user bets on the Kansas City Chiefs to beat the Denver Broncos, the rules should be identical whether the bet is placed online or in a casino. The statement emphasized that Missourians voted to subject sports betting to specific licensing and taxation requirements.

Kalshi maintains it differs fundamentally from traditional sportsbooks like FanDuel and DraftKings. The company notes it does not profit when a bettor loses. This distinction forms the core of its argument for federal rather than state regulation.