Baltimore Sues Kalshi and Polymarket for Unlicensed Sports Betting — First Municipal Lawsuit Against Prediction Markets
The City of Baltimore has filed suit against Kalshi and Polymarket, alleging they operate unlicensed sports betting that allows them to compete with regulated sportsbooks while avoiding state oversight, taxation, and responsible-gambling requirements. Baltimore is the first municipality — rather than a state — to pursue legal action against prediction market platforms. The suit arrives as DraftKings and FanDuel reported weak sportsbook earnings and pivoted toward prediction markets, and as the gap between prediction markets' 18-year-old minimum age and Maryland's 21+ sports betting requirement draws regulatory attention.
The City of Baltimore has sued Kalshi and Polymarket for operating sports betting without a license, making it the first municipality in the United States to file suit against prediction market platforms. The complaint, reported August 13 by Fox 45's Mikenzie Frost, alleges that the platforms 'compete with regulated sportsbooks while avoiding the oversight, taxation, responsible-gambling requirements' that Maryland imposes on licensed operators. Maryland legalized sports betting in 2022 and currently has at least 11 licensed operators, each paying a 15% state tax on gross gaming revenue. Kalshi and Polymarket, operating under CFTC designated contract market licenses, collect no Maryland gaming tax and are not subject to Maryland Gaming Commission oversight.
The municipal filing is a structural departure from the pattern of state-level litigation. Eleven states have sued or been sued in connection with prediction market regulation since early 2026 — all at the state attorney general or state regulatory agency level. Baltimore's suit adds a new plaintiff category: a city with its own interest in tax revenue, public safety, and regulatory compliance that is distinct from the state's interest. Maryland itself has not filed suit against the platforms. Baltimore's choice to sue independently implies either that the city believes the state is moving too slowly, that the city's specific economic stake — as home to several licensed sportsbook retail locations — gives it standing the state lacks, or that municipal litigation is a deliberate strategy to multiply the legal pressure on platforms before the federal courts resolve the preemption question.
The age argument at the center of Baltimore's suit is the sharpest edge in the complaint. Maryland's licensed sportsbooks require bettors to be 21 or older, consistent with the majority of state legal sports betting frameworks. Kalshi and Polymarket, as CFTC-regulated commodity exchanges, impose no federal minimum age requirement above 18 — the standard for commodity trading accounts. The practical result is that an 18-year-old in Baltimore can open a Kalshi account and trade NFL game outcome contracts that a licensed Maryland sportsbook would refuse to accept. Baltimore's complaint frames this gap as a responsible-gambling violation: prediction markets are not subject to the addiction counseling referrals, self-exclusion lists, and advertising restrictions that Maryland mandates for licensed sportsbook operators. Whether federal courts accept that the age gap constitutes a harm that gives the city standing to sue — rather than simply a federal preemption argument the state has already been making — is the threshold legal question the Baltimore suit will have to answer.
The timing of the Baltimore suit adds commercial context. DraftKings and FanDuel both reported weak sportsbook earnings in Q2 2026, with sportsbook revenue declining partly due to prediction market competition. The Sport Business Journal reported this week that both companies are pivoting toward prediction markets as a strategy to acquire customers in states that have not yet legalized sports betting — openly using CFTC-regulated prediction market status to operate where their sportsbooks cannot. That pivot is precisely the dynamic Baltimore's complaint targets: platforms competing with licensed sportsbooks in states where sports betting is legal while expanding unlicensed into states where it is not, paying no gaming tax in either case. If the Baltimore suit survives a federal preemption challenge — which eleven states' worth of litigation suggests will be contested — it could establish that municipalities have independent standing to enforce responsible-gambling and tax-parity arguments that state AGs have not yet prioritized.
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