Kalshi and Polymarket recorded $44.8 billion in combined monthly trading volume in June, marking a 75% surge from May's $25.66 billion, according to The Block's data dashboard. The increase was driven by the FIFA World Cup 2026, which kicked off on June 11. Among the three platforms tracked — Kalshi, Polymarket, and Polymarket US — Kalshi saw the largest month-over-month increase, growing 87.4% to $31.5 billion from $16.81 billion. The surge reflects heightened bettor activity in prediction markets tied to World Cup outcomes, with Kalshi's FIFA World Cup Winner market alone attracting more than $832 million in bets. The platforms are currently facing legal scrutiny from more than a dozen U.S. state-level authorities over sports-related contracts.
Kalshi Records 87.4% Month-Over-Month Volume Increase
Kalshi's monthly trading volume reached $31.5 billion in June, up 87.4% from $16.81 billion in May. The platform accounted for the majority of the combined volume across the three tracked prediction market platforms.
Polymarket Platforms Attract $13.3 Billion in Combined June Volume
Polymarket's main, non-U.S. platform recorded $10.26 billion in trading volume last month, up 45% from the previous month's $7.08 billion. Polymarket had seen a steady decline in monthly volume from March through May. Polymarket US reported $3.04 billion in monthly volume last month, up from $1.77 billion in May. The U.S.-regulated platform sustained an upward trend during the same period.
FIFA World Cup Winner Market Draws $832 Million in Bets on Kalshi
Kalshi's FIFA World Cup Winner prediction market has drawn more than $832 million in bets, with about 35% pegging France as the winner. World Cup prediction markets on Polymarket are also gaining traction, with event contracts on each game attracting $500,000 to $2 million in volume. This year's World Cup is scheduled to end on July 19.
State Authorities Take Legal Action Against Kalshi and Polymarket
More than a dozen state-level authorities have taken legal action against Kalshi and Polymarket, accusing them of offering unlicensed sports betting or gambling to residents. The platforms, alongside the Commodity Futures Trading Commission, argue that federal regulation permits them to offer sports-related markets, overriding state-level jurisdiction.
FAQ
What was the combined trading volume for Kalshi and Polymarket in June?
Kalshi, Polymarket, and Polymarket US recorded $44.8 billion in combined monthly trading volume in June, marking a 75% surge from May's $25.66 billion.
Why did Kalshi and Polymarket see a volume surge in June?
The sharp volume increase can be attributed to the FIFA World Cup 2026, which kicked off on June 11. Kalshi's FIFA World Cup Winner prediction market has drawn more than $832 million in bets.
What legal challenges are Kalshi and Polymarket facing?
More than a dozen state-level authorities have taken legal action against Kalshi and Polymarket, accusing them of offering unlicensed sports betting or gambling to residents. The platforms argue that federal regulation permits them to offer sports-related markets.
