Prediction Markets Just Won Their Biggest Legal Fight Yet

Prediction markets came within days of facing a felony ban in an entire US state. Then a federal judge stepped in and paused it, four days before it was set to take effect. The ruling is being celebrated as a win for Kalshi and Polymarket, and it is one. But the more interesting part is what the judge actually decided, and just as importantly, what she pointedly avoided deciding.

What almost happened in Minnesota

Minnesota passed a law earlier this year making it a felony to operate a prediction market platform in the state, the first law of its kind anywhere in the US. Governor Tim Walz signed it in May, and it was scheduled to take effect on August 1. Lawmakers behind the bill argued that prediction markets, platforms letting users trade real money on the outcome of real-world events, are effectively indistinguishable from the gambling the state already restricts.

Kalshi and Polymarket US didn’t wait around. Along with the Commodity Futures Trading Commission and the Justice Department, they sued Minnesota almost immediately, arguing the state had no authority to regulate what they say are federally overseen financial products, not betting markets.

The legal argument that actually won

The core of the case comes down to one word: swap. Under the Commodity Exchange Act, the CFTC has exclusive federal authority to regulate financial instruments called swaps, agreements where two parties exchange value based on the outcome of some future event. Kalshi and Polymarket US are registered with the CFTC as designated contract markets, which is exactly the kind of entity that federal law says only the CFTC gets to regulate.

Judge Katherine Menendez agreed that many of the contracts traded on these platforms fit that legal definition. A contract tied to who wins a Senate race, who wins the World Cup, or whether the Strait of Hormuz reopens all involve, in her words, clear potential economic, financial, or commercial consequences. That’s the legal threshold for something to count as a swap. And if it’s a swap, Minnesota’s state law is preempted by federal law and simply can’t touch it.

That single finding was enough to grant the preliminary injunction and freeze Minnesota’s ban before it ever took effect.

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The part that didn’t get settled

Here’s what makes this ruling genuinely interesting instead of a simple blowout win: Menendez didn’t rule that every contract on these platforms is automatically protected.

She specifically flagged the opposite end of the spectrum too. A market asking who wins Love Island USA, or what an announcer says mid-broadcast, doesn’t obviously carry the kind of economic consequence that legally defines a swap. Those contracts sit in much murkier legal territory, and Menendez was careful to note that any final, permanent ruling in this case could end up being narrower than this preliminary win suggests.

In other words, the ruling protects prediction markets built around genuinely consequential events, elections, economic indicators, and geopolitical developments far more clearly than it protects the increasingly popular novelty and entertainment markets that have also driven a lot of these platforms’ growth.

Why Minnesota isn’t backing down yet

This injunction pauses enforcement; it doesn’t end the case. Minnesota’s law remains on the books, and the state can still fight to prove it applies to at least some contracts that fall outside the definition of a swap. State officials have been blunt about their underlying concern: prediction markets, in their view, are still gambling by another name, especially after Kalshi suspended a Minnesota political candidate from betting on the outcome of his own race, a scenario that made lawmakers considerably more uneasy about how these platforms function in practice.

That tension, federal financial regulation on one side and state gambling law on the other, isn’t unique to Minnesota. It’s the exact fight playing out in multiple states right now as prediction markets have exploded in popularity over the past two years.

Regulatory uncertainty tends to follow fast-growing industries everywhere, not just in the US. We’ve seen a similar tug-of-war play out with Nigeria’s own approach to tech regulation, where lawmakers paused new rules rather than risk fragmenting a market with conflicting requirements, the same underlying tension driving Minnesota’s fight with prediction markets.

What this means for the rest of the country

Minnesota was the first state to pass a felony-level ban on prediction markets, which made this the strongest legal test yet of whether states can regulate platforms the CFTC already oversees. Other states weighing similar restrictions now have a real, detailed ruling to look at, one that gives prediction market platforms a strong argument for the bulk of their offerings while leaving a genuine opening for states to target the more gambling-adjacent, entertainment-style contracts.

For Kalshi and Polymarket, this is a significant win heading into what’s likely to be a longer fight across other states. For everyone else watching, it’s an early answer to a question that’s going to keep coming up: Where exactly does financial innovation end and gambling begin, and who actually gets to decide that?

It’s also a reminder of how much weight a single court ruling can carry for an entire industry, the same dynamic we saw play out with Anthropic’s landmark copyright settlement, where one case ended up shaping the legal ground rules for everyone else still fighting similar battles.

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FAQ

Did the judge permanently strike down Minnesota’s prediction market ban? No. This is a preliminary injunction, meaning enforcement is paused while the case continues. The judge indicated a final ruling could ultimately be narrower than this early decision.

Why did the judge side with Kalshi and Polymarket? She found that many contracts on their platforms meet the federal legal definition of a “swap,” a financial instrument that only the Commodity Futures Trading Commission has authority to regulate, meaning Minnesota’s state law is likely preempted by federal law for those contracts.

Does this mean all prediction market contracts are now protected nationwide? Not necessarily. The ruling applies specifically to Minnesota’s law for now, and even within that case, the judge suggested that contracts without a clear economic or financial consequence, such as those in entertainment or pop culture markets, may not receive the same legal protection.

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