Infiniti Intelligence Hourly Briefing — Oct 9, 2026 · 10:54 AM ET

Polymarket has sued Massachusetts Attorney General Andrea Joy Campbell and other state officials in federal court in Massachusetts, seeking to prevent enforcement of state gambling laws against its event-contract business, according to Casino.org reporting republished by GambleRss.

The lawsuit centers on who has regulatory authority: Polymarket argues that Congress assigned exclusive oversight of event contracts to the Commodity Futures Trading Commission (CFTC). State officials contend that prediction-market contracts constitute sports gambling offered without a state license.

Federal authority meets state enforcement

Polymarket Chief Legal Officer Neal Kumar outlined the company’s position on X, arguing that oversight belongs to the CFTC rather than individual states and that federal courts should resolve questions affecting national markets. The filing seeks protection from prospective Massachusetts enforcement that the company says federal law prohibits.

The company points to Massachusetts’s injunction against rival Kalshi on Feb. 6 2026 as evidence of the threat. A judge declined to postpone an order requiring Kalshi to cease offering sports-event contracts in the state within 30 days unless it obtained a Massachusetts gaming license, according to the report.

Access and operational risks

Polymarket US argues that comparable enforcement could bring civil penalties, potential criminal liability and a shutdown of its Massachusetts operations, with repercussions for its business nationwide. It also says a state injunction could divide the national market, diminish liquidity, damage banking and commercial relationships, and erode users’ confidence.

Massachusetts is not the company’s only state-level legal challenge; it faces similar obstacles in Nevada. The Massachusetts case could help determine how Polymarket, Kalshi and other prediction-market operators offer sports-event contracts across the country, including whether access remains subject to state-by-state restrictions.

What it means for prediction markets

• Jurisdiction is the central question: Polymarket’s claim of exclusive CFTC authority remains a legal argument, not a ruling in this case.
• Market access is at stake: The Kalshi injunction illustrates the state-level restrictions Polymarket is seeking to prevent.
• Liquidity risks are part of the company’s case: Polymarket argues that fragmented access would weaken liquidity and disrupt business relationships; those are asserted consequences, not established outcomes.

Federal jurisdiction underpins Minnesota injunction

Judge Katherine Menendez granted a preliminary injunction blocking Minnesota’s prediction-market ban, finding that federal law likely overrides at least part of the state statute, according to EGR Intel reporting republished by GambleRss. The decision came on Monday, 27 July, days before legislation making the creation or operation of prediction markets a criminal offence was scheduled to take effect.

In her 44-page ruling, Menendez found that the plaintiffs—the CFTC, Kalshi and Polymarket—were likely to succeed on their federal-preemption claims under 7 U.S.C. § 2(a)(1)(A). Her reasoning centred on the Commodity Exchange Act and the Commodity Futures Trading Commission’s exclusive authority over transactions involving swaps traded on designated contract markets. The injunction is preliminary, rather than a final resolution of the lawsuit.

Prosecution and cancelled trades posed risks

Menendez found that Kalshi and Polymarket US faced a sufficient prospect of irreparable harm to justify relief. Minnesota’s defendants had not ruled out enforcing the statute against them, leaving the platforms exposed to possible criminal prosecution once the law took effect.

The court also considered the consequences of unwinding trades. Given the volume of activity by Minnesotans, forced cancellations could leave Kalshi and Polymarket with significant liabilities to traders. Sovereign immunity would prevent the platforms from recovering damages from the state even if they ultimately won, while enforcement could undermine existing customers’ confidence and discourage new participation. Menendez separately found that encroachment on the CFTC’s exclusive jurisdiction could irreparably harm the regulator.

State opposition continues

Minneapolis Democrat Emma Greenman criticised the decision in comments to MPRnews.org, according to the report. She characterised prediction markets as gambling and argued that the state should retain the ability to regulate them in the public interest.

The ruling coincided with Kalshi’s agreement with the Nevada Gaming Control Board to implement third-party geofencing that would block people physically located in Nevada from using its platform. The report also said that, in the preceding week, two Nevada congressmen had introduced the Prediction Markets are Gambling Act, aimed at stopping platforms from offering sports and casino-style event contracts.

What it means for prediction markets

• Minnesota’s restriction is blocked for now, not finally invalidated. The court found likely federal preemption of at least part of the statute; the underlying dispute remains unresolved.
• Jurisdiction is the central issue. The ruling rests on the CFTC’s exclusive authority under the Commodity Exchange Act, alongside the potential harm from state enforcement.
• Access remains geographically contested. Kalshi’s Nevada geofencing agreement and the proposed federal bill show that the Minnesota injunction does not settle restrictions elsewhere.