Kalshi, the American regulated prediction market, logged $1.89bn of notional turnover on the World Cup final, the match Spain won 1-0 in extra time 1. The platform lets users trade binary contracts on real-world outcomes, each settling at one dollar if the event happens and nothing if it does not.
That contract design is what makes the headline figure slippery. Notional volume values every contract at its one-dollar settlement ceiling and counts both the buyer and the seller, so a single market where one user pays 60 cents for a Spain contract and another takes the opposite side registers a full dollar of notional volume against 60 cents actually committed. The number describes how much churned through the order book, not how much anybody put at risk. It is a real measure of activity, and readers who see it quoted as the amount wagered on the final are seeing a different claim than the one Kalshi's own metric supports.
