Prediction Markets Face Mounting State Legal Battles as Supreme Court Review Looms

Legal battles over the regulatory jurisdiction of online prediction markets such as Kalshi and Polymarket are escalating toward potential review by the U.S. Supreme Court, as state gaming authorities challenge federal oversight of financial derivative bets tied to sporting events.

At the heart of the debate is whether prediction platforms fall under the sole regulatory purview of the Commodity Futures Trading Commission (CFTC) or if they must submit to state-level sports gambling laws. As reported by Mashable Tech, federal oversight under the 2010 Dodd-Frank Act currently permits platforms like Kalshi to sell what it terms 'legal sports event contracts' across all 50 U.S. states, bypassing traditional state gaming regulators. Polymarket, while registered internationally, maintains a U.S. entity operating under federal derivatives oversight.

State officials argue that this framework allows platforms to exploit regulatory loopholes. On Sept. 2, New Jersey Attorney General Jennifer Davenport and Mary Jo Flaherty, interim director of the New Jersey Division of Gaming Enforcement, filed a petition requesting Supreme Court intervention. State regulators contend that Kalshi markets itself as a legal sports wagering application available nationwide while systematically ignoring individual state sports betting statutes.

The petition follows a broader push by state officials across the country. In July, a bipartisan group of 44 state attorneys general signed a joint letter characterizing prediction market platforms as modern casinos that risk market manipulation, asserting that oversight falls squarely within state police powers to regulate gambling. Although sports betting is legal in 39 states and Washington, D.C. as of May 2026, state regulators insist that derivative-style sports contracts constitute unauthorized gambling within their borders.

A growing split among federal circuit courts has heightened the likelihood of eventual Supreme Court intervention. In April, the U.S. Court of Appeals for the Third Circuit ruled in favor of Kalshi, allowing the platform to continue offering contracts on college athletic events in New Jersey. Conversely, in August, the Ninth Circuit Court of Appeals ruled in favor of the Nevada Gaming Control Board, upholding a cease-and-desist order issued to Kalshi for violating state gaming statutes.

Similar legal proceedings have emerged in multiple jurisdictions, including Connecticut, New York, Arizona, and Minnesota. The conflicting rulings between the Third and Ninth Circuits create an unsettled legal landscape for prediction platforms, although the Supreme Court grants review to only a small fraction of petitions submitted annually.

The regulatory struggle also carries significant political and financial ramifications. Former President Donald Trump has publicly advocated for maintaining the CFTC's exclusive regulatory authority over prediction markets to foster platform growth. His son, Donald Trump Jr., serves as an advisor to Kalshi with a personal financial stake, while his venture capital firm is positioned to direct $300 million into Polymarket.