The U.S. prediction market industry — now processing $44.8 billion in combined monthly volume as of June 2026 — faces a jurisdictional conflict between federal derivatives regulators and state gambling authorities that has no modern precedent. New York Attorney General Letitia James filed a $36 b...
"The Proposed Rule goes beyond the CFTC's statutory powers, is in tension with the Constitution, and would otherwise be arbitrary and capricious in its current form." — Andy Wilson, Attorney General of Ohio, in a letter co-signed by 44 state attorneys general
The U.S. prediction market industry — now processing $44.8 billion in combined monthly volume as of June 2026 — faces a jurisdictional conflict between federal derivatives regulators and state gambling authorities that has no modern precedent. New York Attorney General Letitia James filed a $36 billion lawsuit against Kalshi on July 31, calling its sports event contracts illegal gambling. The CFTC responded on August 11 by invoking emergency powers for only the seventh time in its history, ordering Kalshi to continue operating. Two days later, the New York City Council opened a separate probe into Polymarket, Kalshi, Coinbase, and Gemini Titan over deceptive marketing practices targeting young adults.
The clash pits the Commodity Exchange Act's federal preemption doctrine against state gaming statutes across 44 jurisdictions. At stake is whether prediction markets — which have grown from under $5 billion in monthly volume in September 2025 to $44.8 billion by June 2026 — are classified as federally regulated derivatives or state-regulated gambling. The outcome will set the regulatory template for every crypto-adjacent market offering event-based contracts in the United States.
Combined monthly volume across Kalshi and Polymarket rose from under $5 billion in September 2025 to $24 billion in April 2026, then surged to $44.8 billion in June 2026, driven largely by the 2026 FIFA World Cup. Kalshi processed over $30 billion in June alone and has crossed $100 billion in lifetime volume, according to data compiled by DeFi Rate and platform disclosures.
Kalshi holds approximately 73% of prediction market share as of early July 2026, against Polymarket's 27%. Kalshi's monthly volume in May reached $17.91 billion — its ninth consecutive monthly record. Polymarket posted $7.08 billion the same month, down 21% from its March peak.
Sports contracts now account for 75% of Kalshi's volume. The platform recorded $871 million in trading volume on Super Bowl Sunday 2026 alone and gained over 3 million new users during the World Cup, bringing its active monthly user count to 5.1 million, up from 600,000 at the start of 2025. Sacra estimates Kalshi's annualized revenue at approximately $2 billion as of June 2026, up from $735 million in December 2025.
Polymarket's August 2026 month-to-date volume was $1.35 billion as of August 10, with a year-to-date cumulative total of $58.37 billion. Its category breakdown shows sports at $2.25 billion (28%), politics/government at $448.8 million (5.6%), and finance at $107.5 million (1.3%).
In May 2026, Kalshi raised $1 billion in a Series F round at a $22 billion valuation. The round was led by Coatue, with Sequoia Capital, Andreessen Horowitz, IVP, Paradigm, Morgan Stanley, and Ark Invest participating.
On July 31, 2026, New York Attorney General Letitia James filed suit against Kalshi in state court, alleging the platform operates as an unlicensed gambling operation under New York law. The complaint focuses on sports-related event contracts that the AG's office classifies as sports betting, which requires a New York State Gaming Commission license that Kalshi does not hold.
The lawsuit seeks three forms of relief: forfeiture of all gains derived from New York users, restitution to consumers, and treble damages — penalties equal to three times the company's gains. Press reports peg the potential exposure at a minimum of $36 billion, based on cumulative volume from New York-based users.
James simultaneously sought a temporary restraining order that would have prohibited Kalshi from offering event contracts nationwide. Had it been granted, it would have frozen the dominant platform in a $44.8 billion monthly market.
The core legal question is whether Kalshi's CFTC-regulated event contracts constitute "gambling" under New York General Obligations Law, or whether they are federally regulated derivatives subject to exclusive CFTC jurisdiction under the Commodity Exchange Act (CEA). Kalshi holds a Designated Contract Market (DCM) license from the CFTC, the same regulatory classification held by the CME Group and Cboe.
On August 11, 2026, the CFTC invoked Section 8a(9) of the Commodity Exchange Act — its emergency authority, used only six times previously in the agency's history — to order Kalshi to continue operating in compliance with the CEA's Core Principles for designated contract markets.
The order was a direct response to the New York AG's lawsuit. The CFTC's position is that Congress granted it exclusive jurisdiction over event contracts traded on DCM-licensed exchanges, and that state gambling laws cannot override federal derivatives regulation.
The procedural implications are significant. Emergency orders issued under Section 8a(9) can only be reviewed by a federal appeals court, not a state court. This channels any challenge into the federal judiciary and away from the state court where James filed her complaint.
The CFTC is currently in active litigation with nine states defending its position that federal law preempts state gambling statutes as applied to prediction markets. The most consequential ruling to date came on April 6, 2026, when the U.S. Court of Appeals for the Third Circuit affirmed a preliminary injunction in favor of Kalshi against New Jersey, holding that Kalshi demonstrated a "reasonable likelihood of success" in arguing that the CEA preempts state gambling law as applied to CFTC-regulated event contracts.
In the Sixth Circuit case tied to Ohio, 39 states plus Washington, D.C. filed amicus briefs supporting the state's position. The CFTC also filed an amicus brief in that case, reaffirming its claim to exclusive jurisdiction.
On August 12, 2026, New York City Council Speaker Julie Menin announced an investigation into four prediction market platforms: Polymarket, Kalshi, Coinbase, and Gemini Titan. The probe focuses on marketing practices rather than the legality of the underlying contracts.
The Council's letter to the platforms cites specific allegations from a June 2026 Wall Street Journal investigation that found Polymarket paid college-aged influencers to film fabricated trades on lookalike dummy websites — including domains such as "poiymarket.com" — that appeared to show large profitable wagers. The Journal reported approximately 1,100 TikTok videos depicting $1.9 million in fictitious trades.
Menin's investigation is examining four categories of conduct: undisclosed influencer partnerships that may violate FTC endorsement guidelines; videos depicting non-existent trades on websites designed to mimic legitimate platforms; fictitious depictions of profitable wagers that would have generated losses in reality; and the promotion of insider trading. The companies were given 14 days to respond to information requests.
The NYC Council cannot pass laws preventing prediction markets from operating in the city — that authority rests with the state — but it can regulate local advertising practices. Polymarket stated it intends to cooperate with the inquiry.
This probe operates on a separate legal track from the AG's lawsuit. Even if the CFTC's preemption argument prevails on the question of whether prediction markets can operate, the marketing conduct allegations fall under consumer protection law, which historically has not been subject to the same preemption analysis.
On July 28, 2026, 44 state attorneys general submitted a letter to the CFTC opposing the agency's proposed rulemaking framework for sports-related prediction markets. The coalition was led by Ohio Attorney General Andy Wilson. Only Texas, Florida, Georgia, Missouri, and New Hampshire did not join.
The letter argued that the CFTC's proposed rule "goes beyond the CFTC's statutory powers" and "is in tension with the Constitution." The states contend that sports event contracts are functionally identical to sports bets and therefore fall under state gambling regulatory authority, not federal derivatives oversight.
The scale of the coalition — 44 of 50 states — represents an unusual level of consensus among state regulators. The states' interest is partly fiscal: legalized sports betting generated $15.2 billion in gross gaming revenue across U.S. states in 2025, according to the American Gaming Association. Prediction markets operating under federal preemption would bypass state licensing regimes and the associated tax revenue.
A separate amicus brief filed on June 11 by a group of 40 states, led by Nevada Attorney General Aaron Ford and Utah Attorney General Derek Brown, argued that federal preemption claims "rest on an unrealistic premise." The filing supported state authority in the Sixth Circuit case.
The CFTC's own rulemaking process remains in early stages. In March 2026, the commission issued an advance notice of proposed rulemaking (ANPR) to solicit comment on the scope and public-interest implications of "gaming" and "sports competition" in event-contract listings. Final rules are not expected before late 2027 at the earliest.
The regulatory uncertainty has not slowed institutional infrastructure investment. On August 11, 2026, River Markets announced an $8.5 million seed round led by Haun Ventures, with Y Combinator, Coinbase Ventures, and Qube Research & Technologies participating. Individual backers include personnel from Citadel, JPMorgan, and Google.
River Markets is building a prime brokerage for prediction markets — a single interface that aggregates order routing, risk management, and data across platforms including Kalshi and Polymarket. The platform launched May 1 and claims to serve several of the top 10 traders by volume on both Kalshi and Polymarket. The company projects hundreds of millions of dollars in annualized trading volume by year-end.
The existence of prime brokerage infrastructure signals that institutional participants are treating prediction markets as a permanent asset class rather than a regulatory experiment. Prime brokers historically emerge only after a market reaches sufficient volume and regulatory clarity to justify institutional-grade plumbing.
The prediction market industry has grown into a $44.8 billion monthly market in under 12 months, and the legal infrastructure has not kept pace. Three separate regulatory actions — a state AG lawsuit, a federal emergency order, and a municipal marketing probe — are now running concurrently against the same set of platforms.
The fundamental question is binary: either the CEA preempts state gambling law as applied to CFTC-licensed exchanges, or it does not. The Third Circuit's April 2026 ruling favoring Kalshi against New Jersey suggests federal courts may lean toward preemption, but the 44-state coalition and the Sixth Circuit case indicate the issue is far from settled. The CFTC's own rulemaking will not produce final rules before late 2027.
For the platforms, the near-term operating environment is defined by contradictions. Kalshi has a federal agency ordering it to stay open while a state AG seeks $36 billion in damages. Polymarket faces marketing allegations that fall outside the preemption debate entirely. And River Markets is building institutional plumbing for a market whose legal classification remains unresolved.
The economic stakes are substantial. State-regulated sports betting generated $15.2 billion in gross gaming revenue in 2025. If prediction markets are classified as federal derivatives, that revenue stream — and the state tax take — would be rerouted. If they are classified as gambling, every platform operating without state licenses faces exposure to lawsuits modeled on the James complaint.
The resolution will come from the courts, not from voluntary consensus. Until then, the industry operates under a regulatory framework that simultaneously authorizes and prohibits its core product.