US judge temporarily blocks Minnesota prediction market ban
A federal judge granted Kalshi and Polymarket US a preliminary injunction blocking Minnesota's Aug. 1 prediction market ban, finding the platforms likely to succeed on federal preemption claims.
Intelligence analysis by Llama
US District Judge Katherine Menendez ruled that several event contracts on Kalshi and Polymarket US qualify as swaps under the Commodity Exchange Act, giving CFTC exclusive jurisdiction and preempting Minnesota's ban scheduled for Aug. 1.
A judge in Minnesota told the state it can't ban two prediction-market apps yet, because the rules for those apps come from the federal government, not the state. The apps can keep running while the court figures out the full answer.
Analysis
The Federal Preemption Argument Wins a Round
The core of Judge Menendez's reasoning is the federal preemption doctrine. She found that the plaintiffs were likely to succeed "at least in part" on claims that the Commodity Exchange Act preempts the Minnesota statute. The pivotal legal hook: several event contracts offered by Kalshi and Polymarket US appear to qualify as swaps, which would place them squarely under CFTC jurisdiction on designated contract markets. In other words, when a state tries to ban a product that federal regulators oversee, the Supremacy Clause becomes a real obstacle. The injunction preserves the status quo while the case moves toward fuller merits review, meaning the Aug. 1 effective date of Minnesota's ban is effectively paused for these two plaintiffs.
A Win, but a Narrowed One
The court's order is not a blanket victory. Judge Menendez explicitly cautioned that the preliminary injunction could eventually be narrowed, because the plaintiffs had not demonstrated that every event contract listed by Kalshi and Polymarket US met the legal definition of a swap. That nuance matters: the legal reasoning turns on contract-by-contract analysis, and contracts that do not fit neatly into the swap definition could fall outside federal jurisdiction and remain subject to state restrictions. For the platforms, the practical effect is that they can keep operating in Minnesota for now, but they face the longer-term task of building a more comprehensive legal record on contract classification before a final ruling.
The Multi-State Prediction Market Chessboard
Minnesota is not an isolated case. Prediction markets have become a regulatory flashpoint, with multiple states weighing how to treat event-based trading platforms. The Minnesota ruling sits alongside ongoing legal battles in Rhode Island and other jurisdictions, and the preemption framework established here could become a template, or a target, for further challenges. For Kalshi and Polymarket US, the strategy of seeking federal-court relief against state bans is paying immediate dividends, but the patchwork state-by-state approach also means the legal landscape will remain uncertain for months. As Cointelegraph's coverage has noted, the broader prediction market legal battles are heating up, and each new ruling refines the boundaries of how much room states have to act against federally regulated platforms.
Key points
- US District Judge Katherine Menendez granted preliminary injunctions to Kalshi and Polymarket US against Minnesota's prediction market ban
- The court found the Commodity Exchange Act likely preempts the Minnesota statute for several event contracts
- Multiple event contracts appear to qualify as swaps, placing them under CFTC exclusive jurisdiction
- Minnesota's ban was scheduled to take effect Aug. 1 and would have imposed criminal penalties
- The judge cautioned the injunction could be narrowed since plaintiffs did not show every contract meets the swap definition
If the injunction holds and the preemption argument prevails on the merits, Kalshi and Polymarket US would have a clear legal pathway to operate nationwide without state-by-state interference, validating the CFTC's role as the primary regulator for event contracts and giving the sector regulatory clarity.
The judge explicitly warned the injunction could be narrowed if not every contract qualifies as a swap, leaving gaps that Minnesota or other states could exploit to restrict specific products. A final ruling that splits contracts into covered and uncovered categories could force platforms to geo-block certain markets and create significant compliance complexity.
