Arizona Attorney General Kris Mayes filed criminal charges against Kalshi on Tuesday, accusing the prediction markets platform of operating an illegal gambling business in the state and unlawfully allowing users to place bets on elections.

The charges represent the first criminal case filed by a state against Kalshi, marking an escalation in regulatory efforts to police prediction markets operators. The platform has become a focal point in ongoing disputes over which authorities have jurisdiction to regulate prediction market activities.

Kalshi responded to the charges by calling Arizona's case "paper-thin" and arguing that the platform should not be subject to "inconsistent state laws." The company has positioned itself as operating a legal prediction market rather than a gambling platform.

The legal action comes amid broader debates over the regulation of prediction markets, particularly those allowing users to wager on political outcomes and elections. State gaming regulators have increasingly sought to assert oversight over these platforms, leading to conflicts over regulatory authority.

The case highlights the ongoing regulatory uncertainty facing prediction markets operators, who must navigate a complex patchwork of state and federal laws while defending their business models as legitimate financial instruments rather than gambling operations.