Kalshi sues Missouri Gaming Commission over prediction market rules

Kalshi has sued the Missouri Gaming Commission and several state officials, arguing that the federal government—not the state—has the sole authority to regulate prediction markets. The lawsuit, filed Wednesday in the Eastern District of Missouri, follows a crackdown by state officials who claim the platform’s “event contracts” are simply illegal sports bets masquerading as financial instruments, as reported by Courthouse News Service.

On one side, you have a prediction market giant leaning on federal supremacy to bypass local gambling laws. On the other, you have a state government insisting that if you’re betting on the Kansas City Chiefs, you’re playing a game that requires a state license and a tax bill.

The Clash Over “Swaps” and Sports Bets

At the heart of the dispute is a linguistic and legal battle over what a trade actually is. Kalshi argues that its operations are governed by the Commodity Futures Trading Commission (CFTC) under the Commodity Exchange Act. In its federal filing, Kalshi asserts that its “event contracts” qualify as “swaps” traded on designated contract markets, which would grant the federal government exclusive jurisdiction.

Missouri isn’t buying the terminology. Attorney General Catherine Hanaway argues that calling a bet a “contract” doesn’t change its nature. In a cease-and-desist letter sent last month, Hanaway claimed that Kalshi’s platform is subject to state gambling laws because these contracts are bets, not financial swaps. The state’s position is straightforward: if the activity looks like sports wagering, it should be taxed and licensed like sports wagering.

“If you are going to bet on the Chiefs beating the Broncos, the rules should be the same regardless of whether the bet is placed through an online prediction market or at the casino,” a spokesperson for the Missouri Attorney General’s Office stated.

Kalshi Invokes Supremacy Clause Against Missouri Laws

Kalshi is playing a powerful legal card: the Supremacy Clause of the U.S. Constitution. This clause generally ensures that federal law takes precedence over conflicting state laws. Kalshi argues that if it were forced to comply with Missouri’s demands—which include obtaining a state license, paying state taxes, and restricting users under 21—it would jeopardize its compliance with the CFTC’s “impartial access” requirement.

Missourians voted to subject sports betting to specific licensing and taxation rules to ensure state oversight and revenue. By operating under federal guidelines, Kalshi effectively bypasses those local democratic decisions. The state views this as “playing loose and fast” with the law, while Kalshi views it as adhering to a superior federal mandate.

A Growing Trend of Regulatory Friction

This conflict is a symptom of a larger explosion in prediction markets. Since the Trump administration’s CFTC began embracing these platforms, they have spread rapidly, allowing adults to trade on everything from election results to athletic events. Unlike traditional sportsbooks, where “the house” sets the odds, prediction markets use a public-driven pricing model. However, as Courthouse News Service notes, states have struggled to regulate these platforms because they don’t fit neatly into the traditional “gambling” box.

Missouri is not alone in this fight. The state argues that the majority of federal courts have already ruled that such platforms are subject to state gambling laws because the Commodity Exchange Act does not preempt state law in this specific arena.

Kalshi Seeks Injunction to Block Missouri Enforcement

Kalshi is now seeking an injunction to block Missouri from enforcing the cease-and-desist letter. The state had previously demanded compliance by October 16, threatening legal action if the company did not either stop operations or enter the state’s licensing and tax system. The court must now decide if the “event contracts” are indeed financial instruments under federal law or if Missouri has the right to treat them as bets placed in a digital casino.

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