Kalshi and Polymarket reported a combined trading volume of $44.8 billion in June, marking a 75% increase from the previous month, driven by the World Cup events. Kalshi's trading volume surged from $16.81 billion to $31.5 billion, an 87.4% rise. Meanwhile, Polymarket's main platform (excluding the US) saw a 45% increase, reaching $10.26 billion from $7.08 billion, and Polymarket US grew from $1.77 billion to $3.04 billion. Kalshi's World Cup champion prediction market attracted over $832 million in bets, with approximately 35% betting on France to win. On Polymarket, each World Cup match contract drew trading volumes between $500,000 and $2 million.