Intercontinental Exchange (ICE), the parent company of the New York Stock Exchange, has acquired a $2 billion stake in Polymarket, valuing the blockchain-based prediction platform at $8 billion. The platform allows users to bet on the outcome of almost any event, such as elections, sports results, company earnings, weather forecasts, or even the death of the Pope.

Once driven offshore by American regulators, Polymarket has found its way back. In July, under the more permissive Trump administration, the Department of Justice and the Commodity Futures Trading Commission dropped two investigations into the company. Soon after, Polymarket purchased the derivatives exchange QCX, enabling it to operate legally in the United States, and secured funding from Donald Trump Junior’s venture firm, 1789 Capital.

The deal values Polymarket at an $8 billion pre-money valuation, and signals a turning point for prediction markets, edging into Wall Street’s mainstream. It also makes Polymarket’s 27-year-old founder, Shayne Coplan, the youngest self-made billionaire tracked by the Bloomberg Billionaires Index.