New York filed suit against Polymarket on September 24, 2026, alleging the blockchain-based prediction market operates an illegal gambling business in the state without a license. Polymarket countersued the same day in federal court, arguing that the Commodity Exchange Act preempts state gambling...
"Our gambling laws exist to protect New Yorkers, prevent the potential harms of problem gambling, and ensure funding for educational and public benefit programs. By skirting New York's laws, Polymarket is targeting the most vulnerable and depriving New York families of critical services and support." — Letitia James, New York Attorney General
New York filed suit against Polymarket on September 24, 2026, alleging the blockchain-based prediction market operates an illegal gambling business in the state without a license. Polymarket countersued the same day in federal court, arguing that the Commodity Exchange Act preempts state gambling laws as applied to CFTC-regulated event contracts. The dueling filings mark the latest front in a jurisdictional war between state regulators and the federal derivatives framework that now spans six states, two federal appellate circuits, and a $240 billion annual market.
The case arrives at a moment of genuine legal uncertainty. The Third Circuit ruled in April 2026 that federal law shields prediction markets from state gambling enforcement. The Southern District of New York reached the opposite conclusion in July. A circuit split is forming, and the Supreme Court may ultimately decide whether event contracts are swaps or wagers — a classification question with direct consequences for a market that processed $60 billion in volume through August 2026.
New York Attorney General Letitia James filed the state's complaint in Manhattan state court, accusing Polymarket of operating an unlicensed gambling platform accessible to New York residents, including those under the legal gambling age of 21. The state seeks disgorgement of all platform gains, restitution for affected users, and penalties of $100,000 per instance of unauthorized sports wagering offered in New York. The state also seeks treble damages — three times the total gains Polymarket earned through what the state characterizes as illegal operations.
The state's legal theory rests on a straightforward classification: prediction market contracts, particularly those tied to sports outcomes, meet New York's statutory definition of gambling because their resolution depends on events outside the participant's control.
Polymarket responded within hours, filing two actions. First, the company removed the state case to the U.S. District Court for the Southern District of New York. Second, it filed an independent civil suit against Attorney General James and the New York State Gaming Commission, seeking a declaratory judgment that the Commodity Exchange Act (CEA) preempts New York's gambling laws as applied to event contracts traded on federally registered designated contract markets (DCMs).
"We'll fight for our users," Neal Kumar, Polymarket's chief legal officer, said, adding that the company is staying in New York.
The filing is the second major action by New York against a prediction market platform in 2026. The state sued Kalshi in July, advancing the same unlicensed-gambling theory. That case produced a preliminary ruling unfavorable to the industry.
The legal dispute concerns a market that barely existed at this scale two years ago. According to Bernstein, 2026 prediction market volumes are on pace to reach $240 billion, a 370% increase from 2025. Research firm Dealroom projects the sector will hit $1 trillion in annual volume by 2030, implying a compound annual growth rate near 80%.
The two dominant platforms, Polymarket and Kalshi, processed $60 billion in combined volume through August 2026, already exceeding the full-year 2025 total of $51 billion. Polymarket International recorded $10.8 billion in monthly volume at its March peak. Kalshi processed over $30 billion in June alone, driven in part by the 2026 FIFA World Cup. Combined monthly volume across both platforms peaked near $50 billion in July before easing to $45.33 billion in August.
Polymarket's user base reached 780,000 monthly active participants in March 2026, declining to under 650,000 by May. However, its domestic platform — launched through the acquisition of CFTC-registered QCEX — reported 86% growth in new U.S. users and 73% growth in active new traders in the 30 days ending June 3. Robinhood entered the market in June through its Rothera platform, recording $2 billion in notional volume in its first month, capturing 7% of U.S. market share.
Sports contracts account for over 60% of current trading volume. Bernstein expects institutional demand for economic, business, and political contracts to gradually shift the composition, with sports' share declining to an estimated 30% by 2030.
The central legal question across all pending cases is whether the Commodity Exchange Act preempts state gambling laws when applied to event contracts traded on CFTC-registered exchanges.
The CFTC's position is unambiguous. The agency argues that Congress created a national regulatory framework for derivatives markets under the CEA and the 2010 Dodd-Frank Act, granting the CFTC exclusive authority over event contracts traded on federally registered DCMs. Event contracts have traded on CFTC-regulated exchanges in the United States since 2004. Under this framework, event contracts are classified as "swaps" — financial derivatives — not wagers.
States counter that gambling has been regulated under state police powers since before the nation's founding, and that federal derivatives law was never intended to override that authority. Under the presumption against preemption doctrine, federal law must clearly displace state authority in areas of traditional state regulation. States argue the CEA contains no such clear statement regarding gambling.
The classification question is binary: if event contracts are swaps, the CFTC has exclusive jurisdiction. If they are wagers, states retain enforcement authority. Courts are reaching opposite conclusions.
The CFTC has taken the extraordinary step of suing state regulators to assert its jurisdiction. Between April and May 2026, the agency filed complaints for declaratory and injunctive relief against six states:
| State | Filing Date | Court | Status | |-------|-------------|-------|--------| | Arizona | April 2, 2026 | D. Ariz. | Preliminary injunction granted for CFTC | | Illinois | April 2, 2026 | N.D. Ill. | Pending | | Connecticut | April 2, 2026 | D. Conn. | Pending | | Wisconsin | April 2026 | W.D. Wis. | Pending | | New York | April 2026 | S.D.N.Y. | Pending | | Minnesota | May 19, 2026 | D. Minn. | Pending |
Arizona is the most advanced. The state filed a 20-count criminal information against KalshiEX in March 2026, alleging the platform operated an illegal gambling business and engaged in election wagering. The CFTC secured a preliminary injunction blocking Arizona from pursuing criminal charges.
The Minnesota filing marked the sixth suit in seven weeks, reflecting the agency's aggressive posture in asserting preemption across multiple jurisdictions simultaneously.
Indian tribes in California, Wisconsin, and New Mexico have opened a separate litigation track, suing Kalshi and Robinhood for offering sports event contracts accessible on tribal lands — territories where tribal gaming compacts govern permissible wagering activity.
Two federal appellate rulings now point in opposite directions.
Third Circuit (April 6, 2026): In a 2-1 decision, the court affirmed a preliminary injunction barring New Jersey from enforcing its gambling laws against Kalshi. The majority held that Kalshi's sports event contracts qualify as "swaps" under the CEA and that both field preemption and conflict preemption shield them from state regulation. This was the first federal appellate ruling on the prediction market preemption question.
Southern District of New York (July 7, 2026): Judge Analisa Torres denied Kalshi's motion for a preliminary injunction against New York's Gaming Commission. The court found that "New York gambling laws as applied to Kalshi's sports-event contracts are not preempted by the CEA" and that Kalshi had not made "a clear or substantial showing that it is likely to succeed on the merits." The court applied a presumption against preemption "with particular force when Congress has legislated in a field traditionally occupied by the States." Kalshi appealed the same day.
Courts in Nevada, Maryland, and Ohio have also ruled in favor of states. The accumulating split across district courts, combined with the Third Circuit ruling, makes appellate review in the Second Circuit — and potentially Supreme Court certiorari — increasingly probable.
The Polymarket–New York litigation adds another vector. Polymarket's case will be heard in the same Southern District of New York that ruled against Kalshi, before a judge pool that has already demonstrated skepticism toward the preemption argument.
On July 28, 2026, as the CFTC's public comment period on its proposed prediction market rules closed, 44 state attorneys general submitted a letter asserting that the agency lacks authority over sports-related event contracts. The letter, led by Ohio Attorney General Andy Wilson, argued that the CFTC's proposed framework for sports-related prediction markets "extends beyond the authority granted under the Commodity Exchange Act" and called for withdrawal and replacement of the rule.
Only five states — Florida, Georgia, New Hampshire, Missouri, and Texas — did not sign the letter.
The 44-state coalition represents a near-consensus among state law enforcement that sports prediction markets fall within state gambling jurisdiction, regardless of their federal regulatory registration. The letter's timing — filed at the comment deadline — was designed to shape the rulemaking record and signal to courts that state opposition is not limited to a handful of aggressive enforcers.
The CFTC proposed its event-contract rules on June 10, 2026. The comment period closed July 27. As of September 2026, the rule remains proposed, not final.
Polymarket operates on the Polygon blockchain, settling contracts via USDC stablecoins. The platform's architecture — non-custodial wallets, on-chain settlement, pseudonymous participation — is central to the regulatory dispute. New York's complaint specifically targets the platform's accessibility to state residents, including minors, as a harm vector.
For blockchain-based prediction markets, the jurisdictional outcome determines whether on-chain settlement constitutes a regulated financial transaction or an illegal gambling payout. If state gambling laws apply, platforms face licensing requirements, age verification mandates, geographic blocking obligations, and tax remittance duties that would fundamentally alter their operating model.
The economic flow at stake is material. Polymarket's fee revenue derives from trading commissions on contracts that settle in USDC on Polygon. A ruling classifying these as gambling transactions rather than derivatives would redirect value from DeFi settlement infrastructure to state-licensed gambling frameworks — requiring KYC compliance, state-by-state licensing, and potentially relocating settlement to regulated clearinghouses.
For the broader blockchain ecosystem, the case tests whether on-chain derivatives platforms can operate under federal preemption or must conform to a patchwork of 50 state regulatory regimes. The answer will affect not only prediction markets but any tokenized derivative product that states might characterize as gambling or securities under their own laws.
The Polymarket–New York litigation is not a standalone enforcement action. It is the latest data point in a systematic jurisdictional contest between federal derivatives authority and state gambling power — a contest being fought in at least six federal district courts, two appellate circuits, and the CFTC's own rulemaking process.
The $240 billion prediction market is operating in legal limbo. Platforms are simultaneously registered with the CFTC as designated contract markets and accused by states of running unlicensed gambling operations. The Third Circuit says federal law controls. The Southern District of New York says it does not. Forty-four state attorneys general say the CFTC is overreaching. The CFTC says states are trespassing on federal turf.
Resolution will likely require either a definitive appellate ruling — probably from the Second Circuit, given the concentration of cases in New York — or Supreme Court review. Until then, prediction market platforms face the operational reality of defending against state enforcement actions while relying on a federal preemption argument that works in some courts and fails in others. The economic question is not whether prediction markets will continue to grow, but under whose regulatory framework that growth will occur.