Woofun AI data shows that Kalshi recorded a total platform trading volume of $54.338 billion during the 2026 FIFA World Cup, which is approximately 2.6 times higher than Polymarket's $20.988 billion. Kalshi's World Cup-specific event volume reached $13.591 billion, surpassing Polymarket by roughly 31%. In terms of user acquisition, Kalshi's application was downloaded 5.368 million times, significantly exceeding Polymarket's 2.136 million downloads, with on-site venue advertising cited as a primary driver for this lead.

Other platforms reported lower volumes: Predict.fun totaled $1.092 billion, Opinion reached $1.137 billion, and Limitless achieved $0.446 billion. Kalshi and Polymarket collectively hold over 95% of the market share, indicating increased industry concentration where brand exposure and user acquisition efficiency remain critical competitive factors.