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Kalshi and Polymarket’s combined volume surges 75% to $45 billion in June amid World Cup fever

Chimera readability score 55 out of 100, Graduate reading level.

Kalshi and Polymarket's combined volume surges 75% to $45 billion in June amid World Cup fever
Quick Take
- Kalshi, Polymarket, and Polymarket US have reported $44.8 billion in combined monthly volume in June, a 75% growth from May’s $25.66 billion.
- The notable surge in volume can be attributed to the ongoing World Cup, which has attracted millions of dollars in bets on prediction markets.
- Among the three, Kalshi saw the largest month-over-month increase in volume, growing 87.4% to $31.5 billion from $16.81 billion.
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Kalshi and Polymarket saw their combined trading volume soar last month as the FIFA World Cup 2026 continues to drive bettors into prediction markets.
According to The Block's data dashboard, 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 monthly volume.
Among the three, Kalshi saw the largest month-over-month increase in volume, growing 87.4% to $31.5 billion from $16.81 billion.
Polymarket's main, non-U.S. platform attracted $10.26 billion worth of 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, while its U.S.-regulated platform sustained an upward trend. Polymarket US reported $3.04 billion in monthly volume last month, up from $1.77 billion in May.
World Cup fever
The sharp volume increase can be attributed to the FIFA World Cup, which kicked off on June 11. 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 significant 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.
Meanwhile, these prediction market platforms are facing legal scrutiny in the U.S. over sports-related contracts. 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.
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© 2026 The Block. All Rights Reserved. This article is provided for informational purposes only. It is not offered or intended to be used as legal, tax, investment, financial, or other advice.

Sentinel — Human

Confidence

The text reads like standard, well-structured financial journalism that effectively blends concrete data with topical context, indicating a high probability of human authorship.

Signals Detected
low severity: Sentence length variance is uneven; the flow shifts between concise data delivery and slightly more narrative exposition.
low severity: The text successfully connects disparate elements (market volume surge, World Cup fever, legal scrutiny) into a coherent narrative without relying on overly generic transition phrases.
low severity: Uses specific data points ($44.8B, 75% surge, $832M bets) effectively, suggesting reliance on sourced reporting rather than pure LLM confabulation.
low severity: The claims regarding specific financial figures and legal arguments are well-grounded, though the presence of a standard boilerplate disclaimer slightly lowers confidence for perfect human authorship.
Human Indicators
The integration of specific, complex data (market volumes, percentage changes) with an abstract legal discussion suggests specialized journalistic structuring rather than general LLM output.
The subtle variation in tone between the quantitative reporting and the contextual framing avoids the perfectly uniform rhythm often found in pure AI generation.