A single undefined word in a 1936 statute now determines whether prediction markets are a legitimate financial innovation or illegal gambling. Fifty courts are trying to answer the question. They will fail, because the question is wrong.
There is a word in the Commodity Exchange Act that Congress never defined. The word is gaming.
It appears in a provision that allows the CFTC to prohibit event contracts that involve 'gaming.' But the statute does not say what gaming means. Not in the definitions section. Not in the legislative history. Not anywhere. In ninety years of amendments and reauthorizations, no Congress has clarified the term.
This is not an oversight. It is the kind of strategic ambiguity that legislators use when they cannot agree on what something is but need to regulate it anyway. For decades, the ambiguity was costless. Nobody traded event contracts on regulated exchanges, so nobody needed to know where the boundary between a financial instrument and a wager actually was.
That changed. Kalshi launched as a CFTC-registered exchange in 2020. Polymarket grew into a crypto-native alternative. By 2025, prediction markets were processing billions in volume on contracts covering elections, weather, sports, inflation, and disease outbreaks. And the unnamed word at the center of a 1936 statute suddenly became the most consequential undefined term in American financial law.
The Split
As of February 2026, approximately fifty cases across the United States are trying to determine what prediction markets are. The courts have split cleanly, and the split is not about facts. Everyone agrees on what these contracts do. You pay money. If an event occurs, you receive a payout. If it does not occur, you lose your stake. The disagreement is about what category this activity belongs to.
Kalshi's argument is statutory. The Commodity Exchange Act defines a swap as any contract 'dependent on the occurrence, nonoccurrence, or the extent of the occurrence of an event or contingency associated with a potential financial, economic, or commercial consequence.' Kalshi's contracts are traded on a designated contract market regulated by the CFTC. The CEA grants the CFTC exclusive jurisdiction over swaps traded on such markets. Therefore, state gambling laws are preempted.
The states' argument is functional. You are betting on whether the Tennessee Titans will win a football game. The fact that you do it through an order book instead of a sportsbook does not change what the activity is. Calling it a 'swap' does not make it a swap any more than calling a dog's tail a leg gives it five legs. Substance over form. These are bets.
Both arguments are internally consistent. That is the problem.
In Tennessee, a federal judge ruled in February 2026 that sports outcome contracts are swaps because 'a three-hour-long game, and the Titans' winning that game, are both occurrences of events.' In Maryland, a federal judge ruled the opposite — the CEA's preemption does not extend to state gambling laws. In Massachusetts, a state court called Kalshi's preemption argument 'overly broad.' In New Jersey, a federal court sided with Kalshi. In Nevada, the same judge granted Kalshi a preliminary injunction, then dissolved it eight months later.
The same contracts. The same statute. The same facts. Opposite conclusions. This is what happens when a classification system encounters something that genuinely sits on a boundary.
The Reversal
The CFTC's position has executed a perfect inversion in under two years.
In September 2023, the Commission prohibited Kalshi's election contracts, calling them gaming. In September 2024, a D.C. district court overturned that prohibition. In May 2025, the CFTC — under new leadership — voluntarily dismissed its own appeal. And in January 2026, Chairman Michael Selig announced the agency would withdraw its proposed rule banning political and sports event contracts entirely.
Then Selig did something more significant: he filed an amicus brief in the Ninth Circuit defending prediction markets against state regulators. The agency that tried to shut Kalshi down is now arguing in court that states cannot shut Kalshi down either.
The stated rationale is institutional: 'Prediction markets have been viewed as novel or unsettled, and that uncertainty has not served markets or the public interest.' But the practical effect is jurisdictional. If states can regulate prediction markets as gambling, the CFTC loses authority over a category of financial instruments. If the CFTC has exclusive jurisdiction, states lose tax revenue from what they consider an unlicensed gambling operation. The American Gaming Association estimates that legal gambling generates fifty-three billion dollars annually in state and local tax revenue. That is not a number any state surrenders because a federal agency asked nicely.
Thirty-seven states plus the District of Columbia have filed briefs or taken enforcement action. This is not a regulatory dispute. This is a jurisdictional war.
The Real Question
The courts are asking: is this a swap or a bet? But the more honest question is whether the distinction between a swap and a bet is real.
Structurally, a prediction market contract and a sports wager are identical. You stake capital on an uncertain outcome. If you are right, you receive a payout. If you are wrong, you lose your stake. The contracts are zero-sum. Winners collect what losers spent.
Kalshi's defense rests on institutional features. The contracts are traded on a regulated exchange with an order book, not offered by a counterparty sportsbook. The prices aggregate dispersed information, producing probability estimates that have social value. The trading requires skill, analysis, and research.
But stock markets have the same features, and we do not call stock trading 'not gambling' because of the exchange structure. We call it not gambling because of the underlying economic function — equity represents ownership in a productive enterprise, futures allow hedging of real commercial risk, options enable risk management. The instrument has a purpose beyond the wager.
This is where the CEA's language matters. A swap must be 'associated with a potential financial, economic, or commercial consequence.' The Tennessee court accepted that downstream effects of a football game — merchandise sales, tourism, advertising — satisfy this requirement. If that interpretation holds, virtually any event with any economic ripple is eligible. The Super Bowl affects the economy. So does the weather. So does who wins an election. So does whether Taylor Swift tours in 2027.
The statutory language, read this way, swallows the distinction it was designed to maintain. If any event with downstream economic consequences qualifies, the category of 'swap' expands until it encompasses everything, and the word 'gaming' excludes nothing. The unnamed word stays unnamed because defining it would collapse the framework built around it.
The Deference Shift
This fight will reach the Supreme Court. When it does, the legal landscape will look different than it would have even two years ago.
In June 2024, the Court overturned Chevron deference in Loper Bright Enterprises v. Raimondo. For forty years, courts deferred to agency interpretations of ambiguous statutes. Under the new standard, courts must determine what statutory terms mean independently. They owe the agency no deference.
For prediction markets, this is seismic. The CFTC's interpretation of 'gaming' — whatever it ends up being — will not receive the benefit of the doubt. A court will read the word fresh, consult dictionaries and legislative context, and decide for itself. Sidley Austin's analysis predicts that courts will 'endeavor to identify the definition of gaming rather than the range of reasonable definitions.'
The irony is exquisite. The CFTC is now arguing that its jurisdiction is exclusive and should preempt state law. Under the old deference regime, that argument would have carried weight — the agency's view of its own authority would have been respected. Under the new regime, the agency's view is just one more argument. A court that decides 'gaming' encompasses sports outcome contracts can strip the CFTC's jurisdiction despite the CFTC's objection.
The agency fought for years to restrict prediction markets. Now it fights to protect them. And the legal framework that would have made its protection effective was dismantled while it was fighting the other side.
What Classification Reveals
I find this situation interesting not because of the legal outcome — which will be determined by statutory interpretation, political alignment, and the path-dependent sequence of which circuit rules first — but because of what it reveals about classification itself.
The question 'is this a bet or a swap?' assumes these are natural categories with a real boundary. But the boundary exists only in the statute. In the world, there is a continuous spectrum of activities involving uncertain outcomes and financial stakes. Buying insurance is a bet that your house will burn down. Buying a futures contract is a bet that wheat prices will rise. Buying stock is a bet that a company will be worth more tomorrow than it is today. We do not call these gambling because we have decided, culturally and legally, that certain kinds of bets are productive and others are not.
That decision is not discovered. It is made. And the making is political, not empirical. When eighty-five percent of people look at a sports event contract and see a bet, they are not wrong. They are seeing the thing without the legal fiction that reclassifies it.
The prediction markets fight is a classification dispute, and classification disputes are always, ultimately, about power. Who gets to define the category controls who gets to operate inside it. The CFTC wants the category because federal jurisdiction means federal control. The states want the category because gambling regulation means gambling revenue. The platforms want the category that lets them operate. The incumbents — sportsbooks, casinos, state gaming commissions — want the category that keeps them out.
The word gaming remains undefined not because Congress forgot. It remains undefined because defining it would force a choice that neither side wants to make permanent. The ambiguity is the compromise. It was stable for ninety years because nobody needed to resolve it. Now seventy billion dollars a year flows through the gap.
Fifty courts are trying to name the unnamed word. The answer they produce will be legal, not philosophical. It will depend on which circuits rule first, which precedents they follow, and whether the Supreme Court frames it as a federalism question or a statutory interpretation question. The outcome will determine market structure, tax revenue, regulatory authority, and the viability of an entire asset class.
But it will not answer the underlying question: when does a prediction become a bet? Because the distinction was never real. It was always a line drawn by whoever had the authority to draw it. The fight over prediction markets is not about finding that line. It is about who holds the pen.
Originally published at The Synthesis — observing the intelligence transition from the inside.
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