A few years ago, prediction markets were a niche product for people who wanted to trade on elections, interest-rate decisions and economic data. Today, much of their volume comes from something far more familiar: sport. Contracts that pay out on whether a team wins a game have turned prediction markets into direct competitors of sportsbooks – and triggered one of the most significant legal battles in American gambling since sports betting was legalized.
What an Event Contract Is
An event contract is a simple yes-or-no instrument. Each contract pays $1 if the event happens and nothing if it does not. The price, quoted in cents, reflects the market’s view of the probability. A contract trading at 62 cents implies roughly a 62% chance of the outcome. Traders can buy and sell before the event, and the platform earns money through fees rather than by setting odds against its customers.
To a bettor, the result looks a lot like a moneyline wager. To the platforms offering it, the product is a financial derivative – and that distinction is the heart of the dispute.
Because the platform matches buyers and sellers rather than taking a position, prices move with supply and demand. A trader who bought at 40 cents can sell at 55 cents before the game starts and lock in a gain, much like trading a stock. That flexibility is part of the appeal, and it is also why supporters argue the product belongs under financial regulation rather than gambling law.
Two Regulators, Two Rulebooks
Since a 2018 Supreme Court ruling allowed states to legalize sports betting, each state has written its own rules: licensing fees, tax rates, age limits, advertising standards and responsible-gambling requirements. Sportsbooks must comply in every state where they operate.
Prediction-market platforms operate under a different framework. Exchanges registered with the Commodity Futures Trading Commission (CFTC) argue that their contracts fall under the federal Commodity Exchange Act, which gives the CFTC exclusive jurisdiction over derivatives traded on its designated markets. If that argument holds, a federally regulated exchange could offer sports contracts nationwide without a single state gambling license.
The States Push Back
States see this as a direct threat to their authority and their tax revenue. In mid-2026 the conflict escalated sharply, when 44 state attorneys general challenging the CFTC told the agency it had no authority over sports-related event contracts at all. Their argument is about statutory reach: a contract that pays out on the result of a football game, they say, is a sports wager, not a commodity derivative.
Tribal gaming operators have raised their own objections, arguing that nationwide sports contracts undermine the exclusivity they negotiated in state gaming compacts.
The Courts Are Split
The legal picture is unsettled. A federal appeals court sided with the prediction-market side in a case involving New Jersey, finding that federal law preempted the state’s sports-wagering rules. Months later, a federal judge in Manhattan reached the opposite conclusion, and Kalshi’s court fight in New York illustrates how the same contracts can be treated as legitimate derivatives in one jurisdiction and unlicensed betting in another. With courts disagreeing, the question looks increasingly likely to be settled at the Supreme Court.
What Is Really at Stake
The outcome will shape far more than one company’s business model. It will decide who sets the rules for consumer protection, including age limits, which can differ between prediction markets and state-licensed sportsbooks. It affects how much tax revenue states collect from sports wagering, how integrity monitoring works, and whether self-exclusion programs built for licensed sportsbooks apply to sports contracts at all.
It also matters for the licensed sportsbooks, which have invested heavily in state licenses and now face competitors that may not need them. Several large operators have responded by launching prediction products of their own, hedging against whichever way the courts rule.
What It Means for Bettors
For people who bet on sport, the practical takeaway is to understand what kind of product you are using. Event contracts are priced differently from sportsbook odds, with fees in place of a built-in margin, and the protections behind them come from a different regulator. Availability can also change quickly as rulings land, so a market that is open today may not be next month.
Whichever side prevails, the line between betting and trading has blurred permanently. The fight over sports event contracts is ultimately a fight over who gets to define that line – and the answer will shape the US betting market for years.
