Polymarket has opened a new front in the battle between prediction markets and the states. In a court filing against Ohio, the company made the familiar argument that the Commodity Futures Trading Commission (CFTC) has exclusive jurisdiction over its contracts, and then added something different: a claim that Ohio's gambling licensing rules violate the Commerce Clause of the US Constitution. Gambling law expert Daniel Wallach reported the filing on October 20, 2026, and Card Player's Mo Nuwwarah wrote it up on October 22.
If you follow poker and sports betting rather than constitutional law, the reason to care is simple. The outcome of these cases will help decide whether the sportsbook apps you use, and the offshore books many players compare against them, compete with unlicensed prediction markets on a level playing field. It is also a window into how regulators and operators argue about who gets to offer wagering-style products in America.
The usual pattern, and what is new
According to Card Player's reporting, prediction market court fights with states usually follow a set script. States argue that prediction markets are offering unlicensed sports betting. The markets respond that the CFTC, the federal derivatives regulator, has exclusive jurisdiction over what they list.
Polymarket's Ohio filing makes that CFTC argument too. The twist is the second claim. Polymarket says Ohio's rules, which require in-state physical presence and in-state servers for sports betting licenses, discriminate against out-of-state businesses. In the words of the lawsuit: "These discriminatory, balkanizing measures violate the Constitution's promise of open, interstate commerce." It added: "And, under settled precedent, they are unlawful."
The Commerce Clause gives Congress broad power over interstate commerce and, as the reporting notes, limits the ability of states to impair it. A company arguing under it is saying that a state cannot design a licensing regime that effectively walls out anyone who is not already located in the state.
Why Ohio, and why now
The suit responds to cease-and-desist letters that Ohio sent to 10 prediction market operators, including Polymarket. We covered that wave of letters in our report on Ohio's 10 cease-and-desist notices. The Commerce Clause theory gives Polymarket an argument that does not depend on winning the preemption fight over the Commodity Exchange Act.
That matters because, as the Card Player piece puts it, prediction markets have mostly lost in court so far, and the dispute is moving toward a possible Supreme Court showdown. A company that has been losing on one theory has an obvious incentive to bring another. Whether the Commerce Clause argument is strong is for lawyers and judges to decide; what we can say from the filing is that it targets two specific features of Ohio's regime, the physical presence requirement and the in-state server requirement.
Those two features are worth pausing on, because they are not unusual in US gambling regulation. Many states tie licensing to a physical footprint, and the regulated online poker markets that exist today, such as Pennsylvania and Michigan, are built on state-by-state licensing. A broad ruling against in-state presence rules would be a surprise to the regulated industry, and a narrow ruling limited to Ohio's server requirement would be less so. Nothing in the reporting we reviewed tells us how a court is likely to view it.
The other prediction market news
The same Card Player article rounds up several related stories that show how fraught the sector has become.
Restricted contracts. US prediction markets are barred by law from offering contracts tied to unlawful activity, assassination, terrorism, war, gaming and similar activity contrary to the public interest.
The Cornell 7 market. Polymarket's international crypto exchange offered a market on whether any of the Cornell 7, fraternity members accused in a high-profile sexual assault case, would face a felony sex crime charge. Polymarket removed it after more than $450,000 in trading volume and public backlash. The exchange is not subject to the same laws as Polymarket US. The Wall Street Journal reported that the crypto exchange also offered markets on other high-profile cases, and legal experts cited concerns such as jurors betting on their own cases and insider trading.
Kalshi's position. A Kalshi representative said the exchange would not consider offering similar markets. Kalshi CEO Tarek Mansour told CoinDesk on October 14, 2026: "It's a choice of whether prediction markets exist in the U.S. or whether they go offshore." Card Player's author argues that this reasoning could be used to justify many things and ignores the government's obligation to protect the public. Reasonable people can disagree about that, but it is a fair summary of the debate: industry says regulate us at the federal level or we leave; states say we are the ones who protect our residents.
Utah. Utah filed a civil suit against Kalshi on October 20. We cover that in detail in our report on the Utah lawsuit.
How this connects to poker and sportsbooks
Poker players have seen this movie before. Online poker in the United States has spent two decades being defined by state licensing, federal statutes and court rulings about what counts as gambling. Players who remember the fallout from earlier enforcement actions know that regulatory fights tend to be decided slowly and then change the landscape quickly.
The sportsbook angle is closer to home. Licensed sportsbooks pay licensing fees and taxes and follow state rules on responsible gaming, advertising and geolocation. If prediction markets can offer similar products without those obligations, the competitive imbalance is obvious, and that is the core of the state argument. If, on the other hand, Polymarket persuades a court that Ohio's rules unlawfully favor in-state businesses, the ripple effects could reach every state that conditions licenses on in-state servers or presence. Our guides to sportsbooks and the BetOnline sportsbook review explain how licensed and offshore books differ for US customers.
What players should take from this
- Watch the Supreme Court track. The Third and Ninth Circuits disagree on Kalshi's sports contracts. See our explainer on the circuit split.
- Do not assume a product is licensed because it looks like a sportsbook. Check who regulates the operator in your state, and whether your account is protected by player-protection rules.
- Be careful with offshore and crypto-only venues. The Cornell 7 market was on an international exchange that is not subject to the same laws as Polymarket US. If you play at offshore poker sites, read our safe poker sites checklist.
- Expect more state action. Ohio's ten letters and Utah's suit suggest that enforcement will continue until a higher court says otherwise.
Bottom line
Polymarket's Commerce Clause argument will not settle the question of who regulates event contracts. But it shows that the industry is willing to broaden the fight, and that Ohio's licensing design is now in the legal crosshairs. For readers who care about regulated gambling in the US, whether poker, sportsbooks or prediction markets, the next few months of rulings will be worth tracking. We will update this story as the filing progresses.