How Sports Turned Crypto Prediction Markets Mainstream — And Why Regulators Might Shut Them Down

Crypto-native prediction markets spent years positioning themselves as a smarter, more useful alternative to gambling — a way to trade on information rather than spin a roulette wheel. But once sports became their dominant use case, the same products that finally delivered mainstream scale also exposed a deep legal and political vulnerability. The core business that now drives volume on platforms like Kalshi and Polymarket is precisely what a growing coalition of states, regulators, and lawmakers is moving to restrict or outlaw.

From niche to mainstream: how sports supercharged prediction markets

For years, prediction markets revolved around elections, macro data, and policy outcomes. Contracts on inflation prints, Federal Reserve decisions, or political races attracted attention in crypto circles and on Wall Street, but activity was still niche. Sports changed that.

When sports contracts arrived in force, they did what elections and policy wagers never quite managed: they brought scale. Simple questions like who will win tonight’s game, or how many points a player will score, turned event markets from a specialist trading product into something much closer to a retail betting experience. Volume followed, and with it, a much broader audience of users who were not necessarily coming to hedge risk or express complex macro views — they just wanted to bet on games.

That success has pushed the industry into an identity crisis. The fastest path to growth has come from products that look, feel, and are marketed very similarly to conventional sports bets. Yet the legal defenses prediction market operators rely on depend on persuading courts and regulators that these same contracts sit inside the framework of federally regulated derivatives, not state-regulated gambling. The more sports took over as the main use case, the harder that argument became to sustain.

The result is that what once looked like a dispute over a new financial instrument now looks, to many policymakers, like a national question: can a business that behaves like sports betting claim the protections of federal market law and bypass the state-by-state gambling regime that traditional sportsbooks have spent years and billions entering?

The CFTC, states, and Congress: a three-front regulatory squeeze

The regulatory pressure on prediction markets has accelerated quickly and now comes from three directions at once: the Commodity Futures Trading Commission (CFTC), individual states, and Congress.

On March 12, the CFTC opened a formal rulemaking process for prediction markets, explicitly focusing on manipulation risks, oversight, and how event contracts are structured. That alone would have signaled that the federal derivatives regulator intends to put these platforms under a brighter spotlight.

But states have already moved ahead with their own enforcement. Arizona has filed criminal charges against Kalshi, escalating the fight from cease-and-desist letters into prosecutorial territory. A Nevada judge has issued a temporary order blocking Kalshi from operating in that state without a gambling license, after Massachusetts had already acted against its sports contracts. Each action rests on a similar premise: that at least some of these products are unlicensed sports betting pools, not federally protected swaps.

Now Congress is entering the scene. A bipartisan group of senators is preparing legislation that would ban sports bets and casino-style contracts on CFTC-regulated prediction markets altogether. Their argument is that these markets are exploiting a legal gap to bypass state gambling rules and undercut tribal sovereignty. If enacted, that kind of carve-out would directly target the category that currently accounts for much of the industry’s growth.

For crypto investors and web3 users, the message is clear: the fight is no longer confined to a few contested contracts or isolated startups. It has become a systemic question about whether sports-related prediction markets should exist, in their current form, under a federal derivatives umbrella at all.

Bet or swap? The legal question that will define the industry

Beneath the enforcement actions and headlines, the entire dispute hinges on a deceptively simple question: are prediction markets bets, or are they swaps?

As Linda Goldstein of CM Law explains, the answer determines who gets to regulate them. If they are bets, states — and their gambling commissions — are in charge. If they are swaps or derivatives under commodities law, the CFTC takes the lead and state gambling rules generally do not apply in the same way.

States argue that while the contracts may be drafted to resemble derivatives, in substance they are wagers, especially when there is no credible commercial hedging purpose. A user staking money on whether a team wins a game, purely for a payout, looks to state regulators like a bettor, not a hedger.

Operators respond that event contracts have long been treated as commodities products and that a national market cannot function if each state is free to unilaterally redefine a federally supervised instrument as illegal gambling. In their framing, prediction markets are exchanges where users trade risk with one another, similar to other derivatives venues.

The tension is that the same product can be framed convincingly in both ways. From a user’s perspective, the activity is familiar: you put money down on an uncertain outcome and get paid if you’re right. The real disagreement sits one level higher, in how the contract is classified in law and which regime applies. That classification battle has already moved beyond any single platform; it is now about who governs event-based wagering when it is packaged as a market-traded financial product.

For crypto builders and traders, that means regulatory outcomes will not just turn on technicalities; they will turn on how courts and regulators answer a broader, structural question: does activity that looks and feels like gambling stay under state control, or can it be absorbed into federal financial oversight because of how the contracts are structured and traded?

Why contract design and settlement clarity are now existential risks

Much of this will be resolved in court and in rulemaking, but the architecture of prediction products is already shaping how defensible they are. Product design — what gets listed, how it is defined, and how it is settled — is becoming a central regulatory risk.

Platforms often run into trouble when they loosen their standards for what qualifies as a solid event contract. The temptation is obvious: fast-moving, high-profile events drive volume and attention. But contracts that are imprecisely defined or hard to settle cleanly begin to look less like financial hedging tools and more like entertainment wagers.

If the outcome of a binary “yes/no” market depends heavily on interpretation, the market drifts toward the sportsbook model. Ross Weingarten of Steptoe notes that, from a consumer’s standpoint, prediction markets differ from traditional sportsbooks because users trade positions against each other, not against a house. Yet when the underlying question is murky, that distinction offers limited comfort.

He points to a real-world example: bets on whether Cardi B would perform at the Super Bowl. She appeared on stage but did not have a microphone. Did that count as a performance? The answer largely depended on which side of the bet someone held. On prediction platforms, ambiguous questions like this often lead straight to disputes and even litigation.

This is why some sports contracts are far more defensible than others. Markets on simple, hard-to-manipulate outcomes — such as the winner of a game — are easier to justify. In contrast, in-game props, performance metrics, officiating-dependent outcomes, and anything exposed to insider knowledge or match integrity issues sit on much thinner ice.

The industry’s credibility will ultimately be decided by how its platforms look and behave. Exchanges with visible order books, transparent pricing, independent and objective settlement sources, and strong abuse monitoring can make a stronger case that they are closer to capital markets than casinos. Those that resemble bookmakers — with opaque pricing, promotional behavior akin to sportsbooks, or vague event definitions — weaken the argument that they belong under commodities law.

Follow the money: why states are pushing back so hard

States have framed their crackdown as a consumer-protection and public-policy issue. There is substance to that: licensed sportsbooks operate within systems built around age verification, responsible gambling measures, integrity monitoring, local tax collection, and rules tailored to each jurisdiction. From a state’s perspective, prediction markets threaten to route similar activity through a federal channel that bypasses many of those controls.

Goldstein is direct about another driver: money and competition. She notes that event contracts on sporting events represent the vast majority of transactions on platforms like Kalshi and Polymarket, with some estimates putting the figure as high as 90% of event contracts. Those products compete directly with licensed sportsbooks that generate substantial tax revenues for states, which typically tax gross gaming revenue.

According to figures cited by the American Gaming Association, sports betting platforms have lost more than $600 million to prediction markets since the beginning of 2025. For state governments and traditional operators, that is a significant erosion of a carefully built and regulated market.

States also stress that prediction markets circumvent safeguards designed to protect consumers — including age checks, oversight of game integrity, and mandated contributions to gambling support funds. The American Gaming Association has made this case bluntly, accusing sports-focused prediction platforms of sidestepping the state-based system on which legal sports betting is based.

Major sports leagues are adapting to the new landscape as well. Major League Baseball’s agreement with Polymarket and its memorandum with the CFTC on integrity cooperation signal that leagues recognize these markets have grown too large to ignore. At the same time, escalation in states such as Arizona and Nevada shows that some regulators are prepared to treat unlicensed sports pools as criminal or civil violations, not just gray-zone experiments.

Court decisions so far are mixed. Weingarten notes that some courts in New Jersey, California, and Tennessee have found that certain contracts qualify as “swaps” under the Commodity Exchange Act. Courts in Maryland, Nevada, Massachusetts, and Ohio, by contrast, have emphasized the traditional role of states in regulating gambling. Regulation of prediction markets is, as he puts it, very much in flux — and that uncertainty is now intersecting with serious economic incentives.

What a hybrid future could look like for crypto prediction markets

The industry’s assumption has long been that if prediction markets won the jurisdictional fight — convincing courts and regulators that they are federal derivatives markets — their sports contracts would survive within that umbrella. The latest moves in Congress challenge that assumption directly.

The bipartisan bill being prepared in the Senate would carve sports and casino-style contracts out of CFTC-regulated prediction markets altogether. That proposal goes beyond the question of who regulates the markets; it goes to what kinds of event contracts should be allowed at all on regulated platforms. Even if the CFTC asserts, as it has, that it has exclusive jurisdiction over prediction markets like Kalshi and Polymarket, Congress can still decide that certain categories of contracts simply cannot be listed.

For crypto investors, this points toward a likely endgame that is neither a full blessing nor a clean ban. A more plausible destination is a hybrid regime: tighter federal rules from the CFTC, explicit category restrictions that could exclude much of sports betting, heightened surveillance and integrity expectations, and stricter standards for contract clarity and marketing.

Platforms will still be free to call themselves exchanges, but they will increasingly have to prove it through their design choices — how contracts are framed, how they are settled, how abuse is detected, and how users are onboarded and protected. The distinction between “trading on information” and gambling will need to be backed by architecture, not just branding.

Whatever shape it takes, this is not a short-lived flare-up. Prediction markets have reached a scale and visibility that make it unlikely they will simply be regulated away. Instead, the industry is at the start of a drawn-out fight over where finance ends and gambling begins — a process that could stretch on for years and will directly affect what crypto users can trade, where, and under which rules.

Sports brought prediction markets their mass audience by pulling them closer to betting. The question now is whether they can keep that audience while convincing courts, regulators, and the public that they remain something meaningfully different — and whether sports contracts, in anything like their current form, will be allowed to remain at the center of that business at all.