The exchanges bought the bookies. Now comes the data war

The New York Stock Exchange’s parent just completed a $2 billion bet on Polymarket. Kalshi raised a billion at $22 billion while generating fee revenue most exchanges would envy. Seven bills in Congress want the whole category banned. Wall Street is not gambling on prediction markets; it is buying the probability layer of the financial system, and the difference explains everything. Summary Intercontinental Exchange, parent of the NYSE, completed a $2 billion commitment to Polymarket in March, $1 billion in October plus a fresh $600 million, with the platform now discussing new funding near a $15 billion valuation. Kalshi raised more than $1 billion this spring at a $22 billion valuation, roughly doubling in months, on volumes that reached $31.5 billion in June against Polymarket’s $10.8 billion, with fee revenue estimates running from $850 million to $1.5 billion annualized. The tell is the deal structure: ICE bought global distribution rights to Polymarket’s event data and launched institutional probability feeds within months, chairman Jeffrey Sprecher framing the stake as a new layer of financial intelligence, not a venture flyer. The consolidation is visible everywhere: the ri...