According to BlockBeats, on July 21 during the 2026 FIFA World Cup, Kalshi's platform trading volume reached $53.338 billion, approximately 2.6 times Polymarket's $20.988 billion. Kalshi's World Cup-related trading volume hit $13.591 billion, about 31% higher than Polymarket's $10.356 billion.
Kalshi's app downloads reached 5.368 million, far exceeding Polymarket's 2.136 million. The data shows Kalshi and Polymarket have formed a duopoly, collectively capturing over 95% of the prediction market share, with other platforms including Predict.fun ($1.092 billion total volume) and Opinion ($1.137 billion) significantly lagging.