Ingham County Circuit Court Judge Rosemarie E. Aquilina issued the order following a lawsuit filed in March 2026 by Michigan Attorney General Dana Nessel. The ruling requires Kalshi to deploy third-party geolocation and geofencing technology to prevent Michigan residents from accessing its sports markets. It also prohibits Kalshi from running any marketing or advertising campaigns targeting the state. The decision adds Michigan to a growing list of U.S. states that have successfully blocked the platform at the court level.

Nessel welcomed the order directly. "Kalshi long attempted to pass itself off as a legitimate gaming operation in our state, and I am relieved that this order further protects Michigan residents from its predatory, unlicensed practices," she said. Judge Aquilina's four-page ruling found that Kalshi had gained a "massive and unfair advantage" over licensed sports betting operators by bypassing the state's regulatory requirements entirely. The judge cited six specific concerns: Kalshi's minimum age of 18 versus Michigan's 21-plus requirement; absent consumer protections; competitive harm to licensed businesses; reduced tax revenue for schools, first-responder programs, and gambling prevention programs; the impact on Detroit's gaming tax base; and the platform's unlicensed status under Michigan's Lawful Sports Betting Act.

The central dispute in this and similar cases comes down to a single unresolved question in U.S. law: are prediction market contracts financial derivatives or a form of gambling? Kalshi, founded in 2018 and designated by the Commodity Futures Trading Commission (CFTC) as a Designated Contract Market (DCM) in 2020, becoming the first fully regulated U.S. event-contract exchange, argues that its sports contracts are "swaps," a category of financial product regulated exclusively at the federal level under the Commodity Exchange Act. Michigan and other states argue those same contracts fall under state gambling laws. CFTC Chair Michael Selig, speaking in February 2026, publicly backed Kalshi's position, describing state enforcement efforts as a "power grab" and pledging to defend the agency's exclusive jurisdiction over event contracts. Courts have landed on both sides. The Ninth Circuit ruled three to zero that states can regulate prediction markets as sports betting, while a federal court in Tennessee and the Third Circuit Court of Appeals found in Kalshi's favor in separate cases earlier this year. The Third Circuit's ruling, issued on April 6, 2026, specifically barred New Jersey from enforcing its gambling laws against Kalshi. The U.S. Supreme Court received its first prediction market petition on September 2, 2026, raising the possibility of a definitive ruling on the federal-versus-state question.

The scale of what is at stake helps explain why this fight has escalated so quickly. Kalshi processed $13.1 billion in volume during Q1 2026, accounting for roughly 51 percent of total prediction market activity globally during that period. That global share is a separate figure from its domestic standing: within the United States, Kalshi holds approximately 90 percent of the prediction market, a distinct measurement that reflects its near-total dominance at home. Its annualized revenue reached approximately $2 billion as of May 2026, and institutional trading on the platform grew by 800 percent over the preceding six months. The World Cup 2026 alone generated more than $50 billion in prediction market volume across major platforms. Nevada, Michigan, and Washington State have each secured court orders blocking Kalshi sports markets, while Arizona is pursuing criminal charges over alleged violations of election betting laws. The CFTC has responded by filing a counter-suit against Arizona, a move that underscores the federal agency's determination to defend its regulatory jurisdiction. Around 50 active legal cases involving prediction markets are now pending across the country.

For readers outside the United States, the Michigan ruling carries direct regulatory implications. In India, prediction markets were formally classified as illegal under the Promotion and Regulation of Online Gaming Rules, which took effect on May 1, 2026. Enforcement moved beyond classification when, on April 25, 2026, India's Ministry of Electronics and Information Technology issued an advisory warning VPN providers and other intermediaries against enabling access to blocked platforms, including Polymarket. Despite that ban, both Kalshi and Polymarket continued allowing Indian users to sign up and trade as of late May, with enforcement depending primarily on the same geofencing systems Michigan is now mandating by court order. Polymarket alone hosts more than 500 active markets related to India, with over $6 million in reported trading volume from Indian-connected users. In Kenya, the Virtual Asset Service Providers Act 2025, which commenced on November 4, 2025, established a licensing framework for digital asset platforms but leaves prediction markets unaddressed as a distinct regulatory category, a gap that regulators elsewhere on the continent are watching closely. In South Africa, prediction markets sit at the intersection of crypto regulation, exchange-control law, and derivatives law, with no single regulator holding clear authority. The Financial Sector Conduct Authority classified crypto assets as financial products in 2022 under FAIS (the Financial Advisory and Intermediary Services Act), but that framework does not resolve whether prediction market contracts are derivatives or wagers. South Africa's National Gambling Amendment Act remains unproclaimed. SABA has called for treating unregulated prediction market platforms as part of the offshore illegal gambling market until a clearer framework exists.

The Michigan ruling contributes to a growing body of precedent in a legal dispute that could ultimately require Supreme Court resolution. A petition is now before the Court, raising the possibility that the foundational question of federal versus state jurisdiction over prediction markets may receive a definitive answer, though the Court has not yet agreed to hear the case. For regulators and Web3 developers in emerging markets, the ruling offers a concrete model: a court-mandated geofencing requirement backed by economically significant daily penalties. Whether a CFTC license or its international equivalent provides any protection against local enforcement action is now an open and consequential question.