Prediction market platform Polymarket has experienced a significant surge in activity following the start of the World Cup, with the "Soccer" category seeing over $2 billion in transactions in the first ten days, a 300% increase from the previous period. The daily trading volume in this category rose from $53 million to approximately $220 million. Meanwhile, regulated prediction platform Kalshi reported its open interest exceeding $1.16 billion for the first time, marking a 350% increase since the beginning of the year. While Polymarket's overall open interest remained stable during the World Cup, Kalshi, regulated by the CFTC and supporting direct USD deposits, is attracting more U.S. institutions and high-net-worth individuals, positioning itself against platforms like DraftKings and FanDuel.