Prediction markets just crushed traditional sportsbooks in a massive $50 billion World Cup breakout

The numbers are stark. Kalshi posted $31 billion in total notional trading volume in June , a more than 70% jump from May — with sports contracts accounting for around 85% of its trading, per Dune analytics. The company told CoinDesk that World Cup-specific volume on its platform has now reached $22.42 billion. Polymarket's international exchange set a new monthly record at $10.8 billion overall trading volume, while its regulated U.S. platform separately logged $3.5 billion, nearly double May's total. Rothera, a joint venture between Robinhood and Susquehanna International Group that only launched in June, processed $2 billion in its debut month and already accounts for 7% of the U.S. prediction market, according to Bank of America.