Missouri AG orders Polymarket, Kalshi to halt sports event contracts
Missouri's attorney general sent cease-and-desist letters to Polymarket, Kalshi, and other operators on September 18, 2026. The letters order the platforms to stop offering what the state calls sports bets disguised as event contracts. The state accuses the platforms of offering sports betting outside the framework Missouri voters legalized in 2024. The directive targets CFTC-registered exchanges alongside other venues.
Federal registration no longer blocks state gambling enforcement. Missouri's letters treat CFTC-registered platforms the same as crypto-native venues, so Polymarket and Kalshi must now defend their sports contracts in yet another state. Legal budgets stretch across three simultaneous state fights while the Supreme Court decides whether to hear New Jersey's petition.
Each new attorney general filing emboldens the next; Connecticut's order landed with identical logic just days earlier. Traders face fractured liquidity as platforms geofence state by state. The patchwork hardens faster than courts can resolve it. A geofence cascade would split national markets before any federal answer arrives.
Missouri joins Connecticut, Nevada, and Baltimore in treating CFTC-registered contracts as state gambling violations, a pattern that gains ground while Kalshi's Nevada appeal fails and the Supreme Court weighs New Jersey's petition to settle the circuit split.