The City of Baltimore has filed a complaint against Kalshi, the prediction market platform, and its retail partners Robinhood, Webull, and Coinbase, alleging violations of gambling laws and deceptive trade practices. The case lands at the sharpest edge of a running regulatory dispute: whether event contracts on sports outcomes are financial instruments or, as Baltimore argues, gambling by another name.
The complaint and who it names
Baltimore's filing identifies four companies. Kalshi is the platform offering prediction market contracts on sports events. Robinhood, Webull, and Coinbase appear as partners, which pulls some of the largest names in retail brokerage and crypto exchange into a state gambling enforcement action.
The dual allegation matters. Gambling law violations and deceptive trade practices are separate legal theories. The deceptive trade practices track broadens the city's available remedies and does not require proving Kalshi's contracts are technically illegal gambling in every particular.
The regulatory tension
Prediction markets have built their legal argument around federal jurisdiction. The industry's position is that event contracts fall under federal commodity law rather than state gaming statutes, and that state-level enforcement fragments a lawful market.
Baltimore's complaint tests whether that argument holds for sports specifically. Whether sports event contracts occupy the same legal ground as political or economic prediction markets is a question the filing puts directly to the court.
The counterargument
Kalshi and its partners have a serious defense. Federal preemption of state gambling law is a real doctrine, and courts have shown some receptivity to it. If these contracts are federally regulated instruments, Baltimore's statute may simply not reach them.
The case for the city is that a deceptive trade practices claim travels on different rails than a pure gambling count, which may keep the complaint alive even if the primary gambling allegation faces a preemption challenge.
On balance
No ruling has been issued, and no figures from the filing appear in the public record. The line to watch is whether the deceptive trade practices theory survives an early preemption motion, because a city that clears that hurdle hands other jurisdictions a working template. For Robinhood, Webull, and Coinbase, being named as partners in a gambling enforcement complaint is a legal and reputational exposure that will not resolve until the litigation moves.