The district attorney, Letitia James, filed a lawsuit in New York against the Polymarket platform, accusing it of offering contracts tied to sports events in violation of the state’s gambling laws.

The lawsuit filed on Thursday came as part of a series of legal moves targeting prediction markets platforms in the United States, following a similar action against Kalshi in July, as well as earlier lawsuits in April involving platforms associated with Coinbase and Gemini.

According to the court filing, New York relied on the sports-event contracts that Polymarket offers through its mobile application launched in December 2025, as well as what it described as its targeted advertising practices directed at New York residents. Authorities also indicated that they may seek to prevent the platform from accessing residents of the state.

The plaintiff said in its complaint that Polymarket is trying to evade the legal and financial consequences of New York’s strict oversight of gambling by offering what it describes as contracts for events within a "prediction market," while the state believes that the activity at its core is no different from betting.

The case reflects the intensifying dispute between U.S. state authorities and federal authorities over who is authorized to regulate and oversee prediction markets. In contrast, U.S. Commodity Futures Trading Commission chairman Michael Selig said the federal agency has "exclusive jurisdiction" over these firms.

In a separate development this month, New Jersey authorities asked the U.S. Supreme Court to consider its case against Kalshi, a move that could help clarify which entity should oversee this sector. The court has not yet announced whether it will take up the filing.

New York’s lawsuit adds a new layer of pressure on operators of prediction-market platforms, especially regarding product design, marketing methods, and compliance with local laws in the United States.

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