The prediction-market industry just lost a round that matters. The US District Court for the District of Connecticut denied Kalshi's request for a preliminary injunction, clearing the way for the state to enforce its gambling laws against the platform. Judge Vernon D. Oliver concluded that Kalshi's sports-event contracts do not meet the statutory definition of a "swap" under the Commodity Exchange Act, which is the entire legal foundation of Kalshi's claim to operate nationwide under federal oversight. The details here come from the court's ruling and reporting by Sports Betting Dime and others.
The judge's reasoning cut at the core of the industry's argument. A swap, broadly, is a contract tied to whether some event happens; Oliver found these contracts are something else. They "depend on the event's outcomes or discrete in-game occurrences," he wrote, not on whether a game occurs or fails to occur, which in his reading makes them wagers on results, the very thing states license and regulate as sports betting. He went further: even if the contracts were swaps, he said Connecticut's gambling laws would not be displaced by the federal framework. In other words, Kalshi lost on both the "these are financial products" argument and the "federal law wins" argument.
Oliver also pointedly noted that Kalshi has marketed itself as offering "legal sports betting nationwide," even though sports wagering has always been regulated state by state. A Kalshi spokesperson said the company disagrees with the decision and has already appealed to the Second Circuit.
A circuit split heading for the Supreme Court
What makes this ruling consequential is not one state; it is the growing contradiction between courts. Back in April, a divided Third Circuit panel sided with Kalshi, holding that sports-event contracts are likely swaps and that the CFTC's authority likely preempts state gambling law, the first federal appeals court to weigh in, and a win for the platform. Now district courts are pulling the other way: Connecticut here, and a Utah federal judge days earlier, both ruled that states can enforce their gambling laws. That is exactly the kind of conflict that gets the Supreme Court's attention. According to attorney Daniel Wallach, Kalshi now has two appeals before the Second Circuit that may be combined for argument, and prediction-market traders themselves are pricing in roughly a 64% chance of a Supreme Court case by the end of the year.
How it got here
The Connecticut fight started last December, when the state's Department of Consumer Protection issued cease-and-desist notices to Kalshi, Robinhood, and Crypto.com, alleging unlicensed sports wagering. Kalshi sued the next day, arguing the state was intruding on the federal regime that governs derivatives exchanges. This ruling is the state's answer, and at least 34 states and territories have filed briefs backing state control of these markets, a striking show of cross-party consensus that recognizing sports-event contracts as federal swaps would gut local gambling regulation.
Booming business, unsettled law
All of this is happening while the money explodes. Global prediction-market trading volume jumped from $15.8 billion in 2024 to $63.5 billion in 2025 and hit roughly $75 billion by the first quarter of 2026, with monthly volumes now regularly in the $20 billion to $30 billion range and leading platforms valued above $10 billion. The contrast is the whole story of this moment: a business scaling at fintech speed on a legal foundation that a growing number of judges say does not hold. Internationally, the question is less murky, with the UK and Canada generally treating similar products as gambling rather than derivatives.
Our take
We have spent recent weeks covering how confident prediction markets look, the Yankees signing Polymarket, DraftKings' platform hitting $11 billion in annualized volume, Robinhood's event contracts out-earning its stock trading. This ruling is the counterweight, and it is a serious one. A federal judge did not just disagree at the margins; he rejected the industry's core legal theory twice over, on the swap definition and on preemption. That does not end anything, but it is the clearest sign yet that the "we're a federally regulated financial product, states can't touch us" position is genuinely contested, not settled.
For bettors, the practical read has not changed, but it is worth restating as the law hardens. Prediction-market sports contracts are not licensed sportsbooks, and whether they are even legal in your state may soon depend on a Supreme Court that is being teed up right now. Enjoy the products if you use them, but understand you are on unsettled ground, not the same regulated, consumer-protected footing as a state-licensed book. We have tracked this from the congressional hearing to the state lawsuits, and this is the fight reaching the courts in earnest.