Lawsuit Against 10 Platforms Including Coinbase and Polymarket in the US: Louisiana Seeks Emergency Injunction

Louisiana Attorney General Liz Murrill has sued 10 prediction-market platforms—including Coinbase, Robinhood and Polymarket—alleging violations of state law, and is seeking a preliminary injunction to halt their operations in the state. The action targets a sector that has expanded rapidly since the 2024 U.S. election, with platforms such as Polymarket and Kalshi drawing billions in monthly volume. The case matters because it tests whether federally regulated event contracts must also satisfy state gaming and consumer-protection rules, a question already contested in other states. Watch for the court’s ruling on the emergency relief request and whether other state attorneys general file similar suits.