The fight between prediction markets and state gambling regulators escalated on two fronts this week. Missouri's attorney general sent cease-and-desist letters to six companies offering sports event contracts to state residents, including Polymarket and Kalshi. Days later, Kalshi asked federal regulators for permission to let institutional traders use borrowed money on event contracts.
Both developments matter to poker players, and not only because many of us also bet sports. The legal theory being tested here — whether a federally regulated derivatives contract on a sporting outcome is gambling — has direct implications for how skill-based wagering is classified in the US.
What Missouri did
Attorney General Catherine Hanaway issued cease-and-desist letters to six companies for offering sports "event contracts" to Missourians. The state's position is that these products constitute unlicensed sports wagering under Missouri law, regardless of the operators' federal registration.
Missouri joins a growing list. States have pursued prediction market operators through criminal referrals, civil suits and regulatory orders over the past eighteen months, with varying results.
The operators' defence has been federal preemption: Kalshi and the Polymarket US app are regulated by the Commodity Futures Trading Commission, and the argument runs that a CFTC-designated contract market is governed by federal commodities law, not state gambling statutes.
That argument took a significant hit when the Ninth Circuit Court of Appeals unanimously ruled that states can regulate prediction platforms as gambling, siding with Nevada officials and an association of Las Vegas casinos. The ruling does not bind every circuit, but it removes the clean preemption story the industry had been telling.
Separately, tribes in California, Wisconsin and New Mexico have sued Kalshi and Robinhood, arguing that offering sports event contracts accessible on tribal land constitutes unauthorised sports betting in violation of their compacts.
The margin request
The second development is arguably more consequential. Kalshi Klear has filed with the CFTC seeking approval to introduce margin trading on certain event contracts — allowing institutional traders to take positions with borrowed funds.
Margin is standard in derivatives markets. It is also the mechanism that turns a speculative position into a leveraged one, amplifying both gains and losses. Applied to sports event contracts, it means an institution could take a position on a game outcome substantially larger than its posted capital.
This is where the industry's framing gets awkward. Prediction markets have consistently argued they are financial instruments rather than gambling products — price-discovery mechanisms that happen to reference sporting events. Asking to add leverage to a contract on whether a team covers the spread makes the distinction harder to hold, not easier.
For context on scale: combined monthly global trading volume across prediction markets was around $50.6 billion in July 2026. This is no longer a niche.
Why poker players should pay attention
Three reasons.
First, the legal test being applied is the same one that governs poker. Every argument about whether prediction markets are gambling runs through definitions of chance, skill, consideration and prize — the same statutory framework that determines whether poker is a game of skill in any given state. A court ruling that a sports event contract is gambling because the outcome is uncertain sets a precedent that does not distinguish between an event contract and a poker hand.
Second, the money is coming out of the same pocket. Prediction markets compete with regulated sportsbooks and, at the margin, with poker. A player with a fixed monthly gambling budget who discovers event contracts spends less elsewhere. The industry data on this is still thin, but operators are behaving as though the substitution is real.
Third, the regulatory attention is contagious. When state attorneys general and tribal governments start litigating what counts as sports wagering, the definitional work they produce gets applied to adjacent products. Sweepstakes poker has already been banned in multiple states on similar reasoning. The safe poker sites guide covers how to evaluate a room's regulatory footing.
What this means for players
Availability may change with little warning. Robinhood suspended sports event contracts for Michigan users after state action, and the Missouri letters could produce similar withdrawals. If you hold open positions on a prediction market platform, understand what happens to them if the operator exits your state.
Do not treat a CFTC registration as a consumer protection guarantee. Federal derivatives regulation protects market integrity — clearing, settlement, position limits. It is not designed to provide the responsible-gambling protections, deposit limits and self-exclusion tools that state gambling regulators require. Those are different regimes with different objectives.
Leverage on sports outcomes is not a product retail players should want access to. If the CFTC approves margin trading, expect pressure to extend it beyond institutional accounts over time. Any product that lets you take a position larger than your bankroll on a binary outcome is structurally hostile to the person taking it. The logic in our bankroll management guide applies with more force here than it does at a poker table, because a poker hand cannot lose you more than you put in.
For sports betting, stick to operators with a clear licensing position. Our sportsbooks hub covers the main options, and the BetOnline sportsbook, SportsBetting.ag and TigerGaming sportsbook reviews cover books that combine sports and poker under one account — useful if you want your bankroll in one place rather than spread across a derivatives exchange and a poker room.
Where this is heading
The realistic outcomes narrow to three. Congress clarifies the treatment of sports event contracts in federal law, which is the cleanest resolution and the least likely in the near term. The Supreme Court eventually resolves the circuit split on preemption, which is slow but plausible. Or the patchwork continues — legal in most states, contested in several, banned in a handful — with operators geofencing around the worst outcomes.
None of those resolve quickly. In the meantime, the market keeps growing and the litigation keeps accumulating, and the definitions being written in these cases will outlast the specific products that prompted them.
For poker players, the thing worth watching is not who wins. It is what language the winning side uses to describe the difference between a wager and an investment — because that language will eventually be applied to us.
Sources: KCTV5, Daily Caller, CBS Sports