Key Highlights
- Combined trading volume across Kalshi, Polymarket, and Polymarket US reached $44.8 billion in June, marking a 75% surge from May’s figures
- Kalshi dominated with 87.4% monthly growth, capturing $31.5 billion in volume
- Polymarket’s international platform grew 45% to $10.26 billion, while its U.S. counterpart recorded $3.04 billion
- FIFA World Cup 2026, launching June 11, served as the primary catalyst for unprecedented trading activity
- More than $832 million wagered on Kalshi’s World Cup champion market, with France leading at 35% probability
Prediction market giants Kalshi and Polymarket have achieved unprecedented monthly trading volumes in June, driven predominantly by the FIFA World Cup 2026 tournament.
Data compiled by The Block reveals that Kalshi, Polymarket, and Polymarket US collectively processed $44.8 billion in trading activity throughout June. This represents a substantial 75% increase compared to May’s $25.66 billion.
These figures underscore the expanding mainstream adoption of prediction markets, where participants wager actual capital on outcomes spanning political elections, sporting events, and beyond.
Kalshi Dominates Monthly Growth
Kalshi emerged as the top performer among the three platforms. Trading volume on the platform surged from $16.81 billion in May to $31.5 billion in June, representing an impressive 87.4% monthly expansion.
This performance establishes Kalshi as the dominant player by volume, commanding over two-thirds of the trio’s combined total.
Meanwhile, Polymarket’s international platform generated $10.26 billion in June trading volume. This reflects a 45% climb from May’s $7.08 billion figure.
Notably, Polymarket had experienced declining volumes from March through May. June’s performance signals a definitive turnaround in that trajectory.
Polymarket US, the platform’s compliant American offering, generated $3.04 billion in June volume, compared to $1.77 billion in the previous month.
World Cup Tournament Fuels Record Activity
The FIFA World Cup 2026 tournament commenced on June 11 and has emerged as the principal driver behind escalating activity across all three platforms.
Kalshi’s dedicated World Cup champion prediction market has accumulated over $832 million in total wagers. Approximately 35% of these funds back France as the tournament victor.
On Polymarket, contracts for individual matches have consistently generated between $500,000 and $2 million in trading volume per game.
With the World Cup scheduled to conclude on July 19, elevated trading volumes may persist for additional weeks.
These developments unfold as prediction market operators face an increasingly complex regulatory environment within the United States.
Over a dozen state regulatory bodies have initiated legal proceedings against both Kalshi and Polymarket. These authorities claim the platforms provide unlicensed sports wagering or gambling services to their constituents.
Both companies, alongside the Commodity Futures Trading Commission, maintain that federal regulatory oversight permits them to facilitate sports-related markets without requiring state-specific licensing.
This regulatory conflict remains unresolved and has not yet impacted short-term trading volumes.
The June combined figures establish a new monthly volume record for these platforms, with the World Cup tournament still several weeks from completion.
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