The 2026 FIFA World Cup has done something no amount of regulatory lobbying or venture capital could: it turned prediction markets into a genuine threat to the traditional sports betting industry. In the tournament’s opening month, prediction market platforms collectively processed over $50 billion in notional trading volume, dwarfing what legacy sportsbooks typically handle during major sporting events.
The numbers behind the takeover
Kalshi was the runaway leader, posting $31 billion in total trade volume during June. Roughly 85% of that activity was sports-related, with $22.42 billion tied specifically to World Cup contracts. The platform’s total volume jumped more than 70% compared to May.
Polymarket wasn’t far behind in making noise. Its international platform hit a record $10.8 billion in monthly volume, while its US-regulated arm processed $3.5 billion, nearly doubling what it handled in May.
Then there’s Rothera, the newcomer nobody saw coming. Launched in June, the platform managed $2 billion in its first month of existence, capturing roughly 7% of the US prediction market share.
