Spain’s second World Cup title settled the largest sports-related winner markets yet on Polymarket and Kalshi, closing a tournament that brought prediction trading closer to the center of the global sports-betting business.
Available data from the two leading platforms show that they recorded about $5.57 billion in cumulative volume on contracts tied to the tournament champion. Polymarket’s market generated roughly $4.28 billion, while Kalshi’s reached about $1.29 billion.
Meanwhile, that activity formed part of a wider surge across the sector as H2 Gambling Capital estimated that prediction markets accounted for about 27% of legal US sports-betting volume during the tournament, up from roughly 9% at the beginning of the year.
Prediction Markets World Cup Volume as a Percentage of US Sports Bet (Source: H2 Gambling Capital)
This high volume can be attributed to the World Cup tournament giving the platforms a steady sequence of events that elections and major policy decisions rare
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