Baltimore has filed a lawsuit against Kalshi and Polymarket, according to a report from CryptoBriefing. The city alleges the two platforms offered sports betting products to residents without obtaining licenses required under local gambling rules.
Kalshi and Polymarket both operate prediction markets, letting users trade on the outcome of real-world events. Kalshi structures its offerings as event contracts regulated at the federal level by the Commodity Futures Trading Commission. Polymarket runs on blockchain infrastructure and has largely operated outside traditional US gambling licensing frameworks.
Sports-related contracts on these platforms have drawn sustained attention from state regulators. Several states have already sent cease-and-desist letters or opened investigations into whether such products function as unlicensed sports betting rather than legitimate derivatives trading.
The core legal question in these disputes centers on classification. Federal law treats event contracts tied to commodities and financial markets as derivatives, subject to CFTC oversight rather than state gambling law. States argue that sports outcome contracts function no differently from a traditional sportsbook wager, and should fall under their own licensing and taxation regimes.
This tension has produced a patchwork of enforcement actions across the country. Some states have moved to block access to Kalshi or Polymarket outright, while others have pursued litigation or regulatory orders. Baltimore's lawsuit follows that broader pattern, applying the dispute to a municipal jurisdiction rather than a full state.
Neither Kalshi nor Polymarket has issued a detailed public response addressed in the available reporting. Both companies have previously argued in other jurisdictions that federal derivatives regulation preempts state and local gambling law, a position that has met mixed results in courts and before regulators so far.
The outcome of Baltimore's case could influence how other cities and counties approach similar prediction market products. Municipal-level action, as opposed to state attorney general enforcement, represents a newer front in the broader legal fight over how these platforms are classified.
Market Impact
A ruling against Kalshi or Polymarket in Baltimore could encourage other municipalities to pursue similar local enforcement actions. That would add legal and compliance costs for both platforms as they navigate an increasingly fragmented regulatory landscape across states and cities.
For the wider prediction market sector, continued litigation over sports contracts raises the stakes of the unresolved federal-versus-state jurisdiction question. Investors and users should expect ongoing uncertainty around the legality of sports-related event contracts until courts or federal regulators provide clearer guidance.
Baltimore's lawsuit deepens an already contested legal landscape for prediction markets offering sports-related contracts. The case adds a municipal dimension to a fight that has so far played out mainly at the state and federal level.
Frequently Asked Questions
What is Baltimore alleging against Kalshi and Polymarket?
According to the report, Baltimore alleges the two platforms offered sports betting products to residents without holding the required local gambling licenses.
Why do Kalshi and Polymarket argue their products aren't gambling?
Kalshi structures its offerings as federally regulated event contracts overseen by the CFTC, while Polymarket operates as a blockchain-based prediction market, positions both have used to argue state gambling law does not apply.
Is Baltimore the first jurisdiction to take action against these platforms?
No. Several states have previously sent cease-and-desist notices or opened investigations into sports-related contracts on Kalshi and Polymarket, and Baltimore's suit follows that broader pattern at the municipal level.
What could this lawsuit mean for other cities?
If Baltimore succeeds, other municipalities could be encouraged to pursue similar local enforcement actions against prediction market platforms offering sports contracts.