Baltimore sues Kalshi and Polymarket over sports event contracts
The city also names Robinhood, Webull, and Coinbase as Kalshi partners in deceptive-marketing claims in Maryland.
Baltimore and Mayor Brandon Scott filed lawsuits against Kalshi and Polymarket on Aug. 13 alleging the firms ran “illegal, unlicensed sports-betting platforms” and misled users about the “legality and regulatory status of their products.” The complaints escalate the fight over whether sports-related event contracts are CFTC-regulated derivatives or unlawful wagers under state law.
Baltimore is taking prediction markets to court, and it is doing it with the language of gambling enforcement rather than financial-market supervision. The City of Baltimore and Mayor Brandon Scott filed lawsuits against Kalshi and Polymarket alleging the companies operated “illegal, unlicensed sports-betting platforms” and misled users about the “legality and regulatory status of their products.”
The suits focus on sports-related “event contracts,” tradable contracts that pay out based on the outcome of a specific event, where prices function as the market’s implied probability. Baltimore’s theory is straightforward: whatever label the platforms use, the trades function as unlawful wagers under state laws, and the marketing around legality is part of the alleged harm.
Scott framed the action as a response to what the city views as a relabeling strategy. “These companies are running sportsbooks without licenses and betting that a new label will put them above the law,” he said. “It won’t. Baltimore will not let multibillion-dollar companies put profits over people and harm our communities through illegal gambling.”
The Core Legal Fault Line: State Gambling Laws vs. CFTC-Regulated “Swaps”
The lawsuits land in the unresolved jurisdictional gap that has been widening around event contracts. The US Commodity Futures Trading Commission, the federal agency that oversees US derivatives markets, and companies offering prediction-market products have argued that event contracts can qualify as “swaps,” a category of derivatives that can fall under CFTC regulation depending on structure and jurisdiction.
Baltimore is disputing that characterization in both cases, treating the sports contracts as state-law wagers and pairing that framing with claims tied to deceptive trade practices, a consumer-protection theory built around allegedly misleading marketing. That combination matters because it is designed to survive even if defendants argue they are operating in a federally supervised derivatives lane.
Polymarket’s response, as stated by a spokesperson, leaned into federal preemption, the principle that federal law can override or limit state and local enforcement in certain areas. “City-specific action runs counter to the CFTC’s established framework for regulating prediction markets,” the spokesperson said. “As courts have recognized, prediction markets on CFTC-registered exchanges are governed by federal law, not a patchwork of state and local rules.”
Procedurally, key details that typically determine how fast these disputes bite are not yet clear from the public notice: the specific courts and venues, the precise claims pleaded in each complaint, and the remedies Baltimore is seeking, including whether it is asking for injunctions, penalties, or marketing restrictions.
Why Robinhood, Webull, and Coinbase Being Named Changes the Risk Profile
Baltimore’s complaint against Kalshi goes beyond the platform itself and explicitly names Robinhood, Webull, and Coinbase as partners, accusing them of deceptive practices by marketing sports contracts as something that can be “lawfully be purchased and traded in Maryland.” That is a different kind of risk signal than a pure licensing fight, because it pulls broker-style distribution and retail access into the alleged misconduct.
For traders, the immediate market-relevant question is less about the abstract definition of an event contract and more about where liquidity can actually be accessed if local authorities start treating sports contracts as unlicensed betting. When a complaint targets marketing claims about legality in a specific jurisdiction, it creates pressure points that can show up as sudden product restrictions, revised disclosures, or tightened onboarding and geofencing, even before a court reaches the merits.
The other unresolved piece is mechanical: the notice does not specify what, exactly, the named partners did, whether the relationship was distribution, marketing, or product integration, and whether the sports-related contracts at issue were offered through a CFTC-registered exchange structure. Those details will matter if the defendants move early to narrow claims or argue that federal oversight preempts local enforcement.
My Read: This Is a Jurisdiction Test That Could Reshape Where Event-Contract Liquidity Can Live
The filing is being read as a direct attack on prediction markets, but the more durable move is the framing. By calling the products “illegal, unlicensed sports-betting platforms” and pairing that with allegations that users were misled about “legality and regulatory status,” Baltimore is signaling it wants courts to treat sports event contracts as a consumer-protection and gambling-law problem first, and a derivatives classification question second.
The threshold that matters is whether defendants can get early traction on a federal preemption theory tied to the Commodity Futures Trading Commission’s “swaps” lane, because if that fails, the distribution angle created by naming Robinhood, Webull, and Coinbase makes platform access risk feel immediate rather than theoretical. This matters in practical terms if it produces injunctions or marketing restrictions that force sports-related event contracts off major retail channels on a jurisdiction-by-jurisdiction basis.
