For comparison, in May it was only $25.7 billion. The most significant growth was seen by Kalshi, which rose by 87.4%, from $16.8 billion to $31.5 billion. Meanwhile, Polymarket's main platform outside the US increased its volume by 45%, from $7.1 billion to $10.3 billion. At the same time, the growth on the American version of the platform was 72%, from $1.8 billion to $3 billion. The catalyst for this growth was the World Cup in the United States. Notably, Kalshi's prediction market on the tournament winner attracted $832 million. Additionally, bets on individual matches are also drawing millions of dollars. The championship kicked off on June 11 and will last until July 19. During the final matches, an even further increase in trading volumes is expected.