The suit alleges that Kalshi, one of the biggest such markets, exposes New Yorkers to “serious personal and financial risk”.
The lawsuit asked the court to order Kalshi to halt its operation, make restitution to customers, forfeit all illegal gains and pay fines equal to triple those gains.
Online prediction markets have rapidly broken into the mainstream in the United States, positioning themselves as an alternative to both traditional polling and licensed sports betting.
But concern is spreading over allegations of corruption and insider trading based on everything from the top-secret operation to capture Venezuelan leader Nicolas Maduro in January to lucrative bets on the timing of US attacks and ceasefires with Iran.
President Donald Trump’s longtime teleprompter operator, who had access to speeches ahead of time, is reportedly under investigation for using his knowledge to place bets on Kalshi.
Trump’s son Don Jr is an adviser and investor at Kalshi’s big rival Polymarket and his investment company bought a stake in the firm.
Such platforms remain illegal or unregulated in most countries outside the United States. (AFP)
