Six companies got the same letter from Missouri’s Attorney General on September 16, 2026, and none of them can call it a coincidence. Catherine Hanaway ordered Polymarket, Kalshi, Crypto.com, Novig, Underdog, and Robinhood to stop selling sports-related contracts to anyone in Missouri, and she gave each company a 30-day clock to comply. This missouri prediction market ban doesn’t distinguish between a crypto exchange and a fantasy sports app — it treats all six as the same kind of problem.
Look closer at that roster and the differences jump out. Polymarket and Kalshi built their entire business around event contracts. Robinhood and Crypto.com bolted sports-adjacent contracts onto brokerage and exchange platforms that already did something else. Novig and Underdog started out in fantasy sports and sportsbook-style products before pivoting toward the event-contract structure. Hanaway’s office didn’t care about any of that history — the letters judge each company by what the product does, not what the company calls itself or how it got started.
What the Letters Actually Say
Hanaway’s office makes one central argument: these six platforms run unlicensed sportsbooks dressed up as financial instruments. Missouri voters settled the sports-betting question back in November 2024 when they passed Amendment 2, handing the Missouri Gaming Commission control over licensing, taxing, and age verification for every sports bet placed in the state.
The official announcement from the Missouri Attorney General’s office spells out the state’s position directly: calling a sports bet an “event contract” doesn’t exempt it from Missouri’s wagering law. Companies now have until roughly mid-October — 30 days out from September 16 — to either cut off Missouri users or bring their sports contracts under a Missouri Gaming Commission license. None of the six currently hold that license for sports contracts, so compliance means applying for one or walking away from the state rather than restructuring a business model they may not want to defend license-by-license in every state that objects.
Sports Bet or Financial Contract?
Courts across the country are hashing out this exact question right now. Platforms insist their sports contracts qualify as event derivatives under federal CFTC oversight, not state-licensed bets. States insist the opposite: call it whatever you want, if the payout hinges on who wins a football game, that’s gambling.
Kalshi and Polymarket build their defense on the Commodity Exchange Act, which puts the CFTC in charge of futures and derivatives trading on registered exchanges — and they argue that federal status preempts state gambling law entirely. States counter that gambling regulation has stayed local for generations, and Congress never intended commodities law to override sports betting rules just because someone structures a bet as a yes/no contract instead of a point spread.
Missouri’s own framework taxes sports betting revenue at 10% and funnels that money into public education, while also enforcing a minimum age of 21. Prediction markets generally skip both requirements since they don’t operate under a state gaming license, and that gap is exactly what’s driving regulators up the wall. Every dollar that flows through an unlicensed event contract is a dollar that never reaches the funding stream Missouri voters approved when they passed Amendment 2.
How Polymarket and Kalshi Are Responding
Both companies reject Missouri’s characterization outright. A Polymarket spokesperson insists its markets answer to federal CFTC oversight, not a patchwork of fifty different state gambling codes. Robinhood makes essentially the same case, pointing to Robinhood Derivatives LLC — its CFTC-registered entity — as the reason state gambling law shouldn’t apply to its contracts.
Kalshi has leaned on this federal-preemption argument before, and the results haven’t been consistent. Anyone who followed the CFTC’s Tenth Circuit ruling on Kalshi’s stay request in Utah already knows how that one ended: the argument lost, and Utah can now enforce its own gambling law against Kalshi while the broader case plays out. Missouri’s letter never mentions that ruling by name, but the timing tells its own story — state attorneys general have watched appellate courts reject blanket preemption claims, and that track record likely explains why more states are firing off cease-and-desist letters now instead of waiting for one nationwide answer.
Missouri Joins a Crowded Fight
Missouri didn’t start this fight and won’t finish it alone. At least 11 states have already sent cease-and-desist letters to prediction market operators, and roughly eight of those disputes have turned into active litigation. Washington State took a different approach in its own standoff with Kalshi, geofencing select contracts instead of demanding a full shutdown, and that case shows one alternative path this dispute could still take.
Nevada picked the harshest tool available, threatening a $120,000-per-day fine over geofencing failures. Missouri’s letter reads closer to Utah’s opening move than Nevada’s: set a compliance deadline first, escalate to legal action only if companies ignore it. What happens next depends entirely on how Polymarket, Kalshi, and the other four companies respond inside that 30-day window. Judging by what’s played out in other states, partial compliance looks like the most likely outcome — expect some platforms to geofence Missouri residents out of sports contracts specifically while leaving election markets or economic-indicator contracts untouched.
Why This Matters for Missouri Users
Missouri residents trading sports contracts on any of these six platforms don’t face an immediate shutoff. Thirty days gives companies room to geofence the state or start negotiating, and Utah’s and Washington’s experience shows these fights usually drag into months of court filings rather than resolving overnight.
Still, every state that has pushed hard enough has watched platforms eventually restrict sports contracts, even as the companies keep fighting the underlying legal question in federal court. Missouri traders should plan for access changes to arrive well before any court settles the jurisdiction question. Keep an eye on whether any of the six companies decide Missouri is the state where they finally apply for a gaming license instead of fighting — a deal like that could become the template other states start demanding too.
The Bigger Picture
Missouri’s cease-and-desist order adds one more point to a regulatory map that keeps splintering further. Federal regulators want a single national standard built around the CFTC. State gaming commissions and attorneys general want licensing, taxation, and age verification handled their own way, state by state. Until Congress or the courts pick a winner, Polymarket and Kalshi will keep racking up cease-and-desist letters one state at a time, and traders will keep watching their sports markets grow or shrink depending on which zip code they’re trading from.
