The U.S. Commodity Futures Trading Commission filed amicus briefs in several ongoing cases in recent months, including a filing on February 17 before the Ninth Circuit in Nadex/Crypto.com v. State of Nevada and another on April 24 before the Massachusetts Supreme Judicial Court, arguing that event contracts traded on federally licensed exchanges fall entirely under federal jurisdiction. The move is part of a coordinated legal push by the CFTC to neutralize state-level enforcement actions targeting prediction market platforms, principally KalshiEx LLC, a centralized exchange regulated by the CFTC and last valued at $11 billion in March 2026.

To understand how this conflict arose, it is necessary to trace back to late 2024, when a federal court ruled that election-based event contracts do not constitute illegal gambling. Kalshi used that ruling as a springboard to launch sports event contracts in early 2025. That move triggered a wave of state cease-and-desist orders and fines, as state gambling regulators argued they held authority over sports-related wagering products regardless of a platform's federal license.

The legal conflict sharpened on March 9, when U.S. District Judge Sarah D. Morrison in Ohio ruled that Kalshi's sports event contracts constitute gambling under state law and therefore fall under the authority of the Ohio Casino Control Commission rather than the CFTC. Ohio subsequently issued a $5 million fine against Kalshi. Judge Morrison warned that accepting Kalshi's preemption argument would effectively put every sportsbook in the country out of business, a result she called "absurd." That reasoning has become a rallying point for state regulators.

On April 24, a coalition of 38 state attorneys general filed a counter-brief in a Massachusetts case, co-led by Ohio AG Dave Yost and Nevada AG Aaron Ford, arguing that states retain authority over sports wagering and that Kalshi's reliance on federal preemption has no legal basis. Notably, the CFTC simultaneously filed its own Massachusetts brief on the same date, making the adversarial filings land in tandem. "Prediction markets cannot ignore states' gambling laws that are designed to protect consumers," New York AG Letitia James said in April. The CFTC pushed back hard. The agency characterized state enforcement actions as a "power grab that ignores the law and decades of precedent" and filed injunctive lawsuits against Arizona, Connecticut, Illinois, and New York to block state enforcement against both Kalshi and Polymarket. It secured at least one temporary restraining order in Arizona.

The core legal question is whether sports event contracts qualify as "swaps" under Section 1a(47) of the Commodity Exchange Act (CEA), which would give the CFTC exclusive federal jurisdiction, or whether they fall under the CEA's gaming exclusion, which would leave them to state gambling regulators. The CFTC argues on three grounds: that Congress gave it exclusive field authority over derivatives traded on designated contract markets; that complying with state bans is structurally impossible for federally licensed exchanges required to provide impartial market access; and that state-by-state enforcement recreates the regulatory fragmentation that Congress intentionally removed through the 2010 Dodd-Frank Act. The circuit courts are already split. On April 7, the U.S. Court of Appeals for the Third Circuit ruled in a New Jersey case that sports event contracts are swaps and therefore preempted by federal law, directly contradicting the Ohio district court ruling. A Ninth Circuit case arising from Nevada remains active, and its outcome could further define the contours of the split. The CFTC's willingness to engage as amicus in these cases is itself historically unusual: the agency has filed only approximately eight amicus briefs since 2000, making the current campaign a notable escalation. According to prediction market pricing, traders currently place the probability at 64 percent that the Supreme Court takes up a sports event contract case before the end of 2026.

The commercial stakes are significant. Kalshi generated $5.42 billion in taker volume in April 2026 alone, representing roughly 72 percent of the entire sector's $8.6 billion monthly volume. Its blockchain-based rival Polymarket, which runs on the Polygon blockchain, posted $1.99 billion in April volume. Combined open interest across both platforms reached $1.11 billion as of May 1, up roughly six times from $192.6 million a year earlier. Approximately 90 percent of Kalshi's volume is tied to sports contracts, making the legal outcome existential for its current product line. Polymarket's position in the dispute carries its own forward-looking dimension: the platform is engaged in re-entry discussions with the CFTC, and a favorable federal ruling could accelerate those talks while generating knock-on effects for the Polygon blockchain's total value locked and for UMA, the protocol that serves as Polymarket's oracle layer. Congress has also weighed in: on March 23, Senators John Curtis (R-UT) and Adam Schiff (D-CA) introduced the bipartisan "Prediction Markets Are Gambling Act," which would amend federal law to bar sports and casino-style event contracts from CFTC-regulated platforms.

Outside the United States, the outcome will carry real weight. In South Africa, prediction market contracts sit uncomfortably at the intersection of crypto regulation under the Financial Sector Conduct Authority, derivatives law under the Financial Markets Act, and gambling law under the National Gambling Act. No single framework currently resolves the classification question; the National Gambling Amendment Act, which might provide clarity, still awaits proclamation. South Africa's April 2026 regulatory overhaul added a high-surveillance crypto capital controls structure but left the prediction market gap open. Nigeria, which leads Africa in retail crypto adoption, has no specific prediction market guidance despite a large informal sports betting market. Kenya formalized a licensing framework for virtual asset service providers in 2025 but has not addressed event contracts directly. In Southeast Asia, Singapore banned Polymarket in 2025. Regulators in Pakistan and Bangladesh are likely to lean toward gambling-style classifications unless U.S. courts establish a strong precedent for the financial instrument interpretation. India presents a more complex and genuinely uncertain picture: its regulatory posture mirrors the exact tension playing out in U.S. courts, with competing central and state authority frameworks under the Reserve Bank of India and the Securities and Exchange Board of India leaving the classification question unresolved rather than settled in either direction.

A Supreme Court ruling favorable to the CFTC would effectively classify prediction market contracts as federally regulated financial instruments, opening the door to institutional participation and giving international regulators a reference framework as they develop their own rules. The window for regulatory arbitrage is narrowing: as the U.S. legal outcome moves toward resolution, it is expected to set international precedent that forecloses the ambiguity that operators and users currently rely on. For users in South Asia and Africa who access platforms via VPN, that narrowing carries a concrete risk. If U.S. courts validate the federal financial instrument framework, other jurisdictions are likely to accelerate their own enforcement efforts, raising the legal exposure of users who have depended on geographic workarounds. Until then, developers building on prediction market infrastructure and users in jurisdictions without clear classification should treat the current legal environment as unsettled.