Woofun AI data shows that combined open interest on Kalshi and Polymarket declined by 20% from a July peak of approximately $2 billion to roughly $1.5 billion. Kalshi sports trading volume decreased from $9 billion to $4 billion, while Polymarket volume dropped from $2.3 billion to $740 million. Sports events comprised about 80% of total trading volume on these platforms during the tournament. Spain defeated Argentina 1-0 to claim the title. In Polymarket’s championship market, 194,000 addresses participated, with approximately two-thirds incurring losses.