Missouri spent the week telling six companies, in writing, that the “investing” product on their app is a bet. On September 18, Attorney General Catherine Hanaway sent cease-and-desist letters to Polymarket, Kalshi, Crypto.com, Novig, Underdog, and Robinhood, giving each 30 days to stop offering sports event contracts to Missouri residents or face enforcement. “Missourians voted for a safe, well-regulated sports wagering market,” Hanaway said. “Companies cannot repackage sports bets as ‘event contracts’ to avoid Missouri law.”

If you’ve got a Robinhood account and you’ve tapped into the prediction markets tab to take a Yes/No position on an NFL game, this is the part where the label on that product stops being settled fact and starts being a live legal fight. Missouri isn’t first to send this letter. It’s not close to last, either. The states and the federal government are now arguing about it in front of judges who don’t agree with each other.

Quick Verdict

What happened	Missouri AG sent cease-and-desist letters to 6 platforms offering sports event contracts
Deadline	30 days from Sept. 18, 2026, or Missouri pursues enforcement
Who got the letter	Polymarket, Kalshi, Crypto.com, Novig, Underdog, Robinhood
Missouri’s argument	Sports event contracts are unlicensed sports betting dodging state tax and licensing
Robinhood’s argument	Contracts trade through Robinhood Derivatives LLC, a CFTC-registered entity — federal law preempts state gambling rules
Is this settled?	No. Federal circuit courts are split and the fight is headed toward the Supreme Court
Best move right now	Assume the contracts could get switched off in your state with little warning

What Missouri’s Letter Actually Says

Missouri legalized sports betting by ballot measure in 2024, and the regulated market launched December 1, 2025, with licensed operators paying a 10% tax on gross sports betting receipts and required to keep anyone under 21 off the platform. Hanaway’s office says the six companies are running the same product (a bet on whether something happens in a game) without the license or the tax, and in several cases without verifying age at all.

That’s the crux of it. Missouri isn’t arguing that sports event contracts are complicated or novel. It’s arguing they’re sports bets with new packaging, and that packaging is doing the work of avoiding a law voters just passed.

Robinhood’s Defense: “We’re Not a Sportsbook”

Robinhood’s answer is structural, not semantic. It doesn’t offer these contracts directly. They run through Robinhood Derivatives LLC, a registered futures commission merchant with the CFTC and a member of the National Futures Association, trading on exchanges like KalshiEX and ForecastEX that are themselves CFTC-regulated. The argument: these are derivatives under the Commodity Exchange Act, federal law occupies that field, and a state gambling statute can’t reach a product Washington already regulates.

It’s the same argument Kalshi has been making in court for over a year, and it’s not a fringe legal theory: it’s already won in at least one federal appeals court. Whether it wins everywhere is the entire fight.

Is Kalshi Gambling? What Regulators Actually Disagree About

Missouri’s letter is one entry in a fight playing out in courtrooms and statehouses across the country at the same time:

1. Connecticut went further, and earlier. Its Department of Consumer Protection issued cease-and-desist orders to nine platforms (Polymarket, Coinbase, Crypto.com, Robinhood, ProphetX, Novig, Webull, Gemini, and Underdog) and sent roughly 30 subpoenas to payment processors, data providers, and media companies to trace how these contracts get marketed and funded.
2. The CFTC sued the states right back. Starting with Arizona, Connecticut, and Illinois in April, the CFTC has now taken nine states to court (adding New York, New Mexico, Minnesota, Rhode Island, Wisconsin, and Kentucky), arguing the Commodity Exchange Act gives it exclusive jurisdiction and state enforcement against CFTC-registered platforms is preempted.
3. Federal appeals courts split on the exact question. The Third Circuit ruled sports event contracts are federally regulated swaps that states can’t touch. The Ninth Circuit, ruling against Kalshi in a Nevada case, said the opposite: they’re not swaps, and states can enforce their gambling laws.
4. New Jersey is now asking the Supreme Court to settle it. New Jersey filed a certiorari petition after that circuit split, and Robinhood and Crypto.com’s exchange partner have each filed their own petitions asking the Court to take up the Ninth Circuit’s ruling against them.

That’s four different fronts of the same argument, running simultaneously, with no single court’s answer binding the others yet.

The Circuit Split, in Plain Terms

Here’s what actually happened in the two rulings that matter most. In New Jersey, the Third Circuit sided with Kalshi and blocked the state from enforcing its gambling law against sports event contracts, reasoning that they’re swaps under federal law and federal law preempts the field. Months later, in Nevada, the Ninth Circuit looked at nearly the same question and ruled 3-0 against Kalshi, finding sports event contracts aren’t swaps at all and states are free to regulate them as gambling.

Two federal appeals courts, two opposite readings of the same statute. That’s exactly the kind of split the Supreme Court exists to resolve, and Crypto.com and Robinhood have both asked it to. As of this writing, though, none of the petitions have been granted, and there’s no guarantee the Court takes any of them this term.

Missouri’s cease-and-desist doesn’t wait for that answer. It just assumes its own side of the argument is right and starts the 30-day clock.

The Risk Regulators Keep Flagging: Who’s Actually Trading These

Missouri’s action came with a warning that had nothing to do with taxes or licensing. Taylor Brown, a gambling addiction counselor at Midwest Recovery Centers, told local reporters that young users are particularly vulnerable to these platforms, not because the product is confusing, but because it isn’t. “People have access to this in their pocket and it’s a pretty addictive thing to have access to,” Brown said. “It’s a flood of dopamine.”

That framing should sound familiar if you’ve read anything about Robinhood’s core app. We’ve written before about how Robinhood’s design leans into confetti and streaks to make trading feel frequent rather than deliberate, a behavior-design critique of stock trading. Apply the same mechanism to a Yes/No contract that resolves in three hours instead of three years, and the addiction-counselor framing stops sounding like a stretch.

What This Means If You Trade Sports Event Contracts

A few practical things, regardless of how the legal fight eventually shakes out:

• The product could disappear from your state with 30 days’ notice, or less. Missouri gave 30 days. Connecticut moved faster and paired its order with a demand that platforms let users withdraw funds immediately. Don’t assume the contracts you hold today will still be tradable next month if you live in a state that’s taken action.
• “CFTC-registered” is not the same as “this dispute is resolved.” Robinhood Derivatives being a registered futures commission merchant is true and verifiable. It’s also exactly the fact both sides agree on and disagree about the legal consequences of. Don’t read the registration itself as a state-by-state guarantee.
• This sits next to a pattern, not an isolated event. Robinhood has spent 2026 racing ahead of regulatory certainty more than once. See the SEC’s new tokenized stock exemption, where the company was first to ship before the rules were fully settled. Prediction markets follow the same shape: real product, real revenue, and legal footing that hasn’t caught up.
• If you’re using Robinhood for banking or cards too, that’s a separate risk bucket. Robinhood’s push into banking products and its credit card lineup doesn’t carry the same legal exposure as event contracts. Don’t let uncertainty about one product line make you nervous about accounts that aren’t actually implicated.

Our Take

I don’t think Missouri is wrong to be skeptical, and I don’t think Robinhood’s preemption argument is frivolous either. That’s the uncomfortable part. A sports event contract that resolves on a coin-flip outcome in a few hours, marketed inside an app people already associate with stock trading, functions a lot like a bet regardless of which federal statute technically governs it. At the same time, a company that’s genuinely CFTC-registered and trading through CFTC-regulated exchanges has a real argument that a state can’t unilaterally override federal jurisdiction because it doesn’t like the outcome.

Both things can be true, which is exactly why this needs a court — ideally the Supreme Court — to settle instead of 50 states and one federal regulator fighting it out jurisdiction by jurisdiction. Until that happens, treat these contracts the way Missouri’s addiction counselor described the product, not the way Robinhood’s compliance page describes the entity offering it. The money is real either way.

The Bottom Line

Missouri’s 30-day letter is one skirmish in a fight already playing out in Connecticut, Nevada, New Jersey, and federal court dockets tied to nine states the CFTC has sued directly. Two appeals courts disagree on whether sports event contracts are federally protected derivatives or state-regulated gambling, and the Supreme Court hasn’t said yet whether it’s even taking the case. If you’re trading these contracts through Robinhood, Kalshi, or any of the other five platforms named this week, the honest read is: the product works today, the legal ground under it doesn’t hold still, and your state could be next.

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Reporting based on the Missouri Attorney General’s September 18, 2026 announcement, KFVS12, WSHU, the CFTC, Yahoo Finance, and Casino.org. Legal status varies by state and is actively being litigated; verify whether sports event contracts are available in your state before trading.