Key Highlights
- Total trading volume across Kalshi, Polymarket, and Polymarket US reached $44.8 billion in June, reflecting a 75% surge from the previous month
- Kalshi experienced the strongest expansion with an 87.4% increase, achieving $31.5 billion in monthly 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 on June 11, served as the primary catalyst for the dramatic volume increase
- More than $832 million wagered on Kalshi’s World Cup championship market, with France leading at 35% probability
The prediction market industry witnessed unprecedented growth in June as platforms Kalshi and Polymarket experienced their highest combined monthly trading volumes, driven predominantly by the FIFA World Cup 2026.
The Block’s data reveals that Kalshi, Polymarket, and Polymarket US collectively generated $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 appeal of prediction markets among mainstream audiences, platforms where participants wager actual currency on outcomes spanning political events, sports competitions, and more.
Kalshi Dominates Monthly Growth
Kalshi emerged as the top performer among the three platforms. The platform’s trading volume surged from $16.81 billion in May to $31.5 billion in June, representing an impressive 87.4% monthly gain.
This performance establishes Kalshi as the dominant platform by volume, capturing over two-thirds of the total combined trading activity.
Meanwhile, Polymarket’s global platform, which serves users outside U.S. borders, registered $10.26 billion in June trading. This marks a 45% uptick from May’s $7.08 billion.
Polymarket had experienced consecutive declines from March through May. The June results signal a significant turnaround in this downward pattern.
Polymarket US, the company’s compliant American platform, generated $3.04 billion in June volume, climbing from $1.77 billion in the preceding month.
World Cup Emerges as Primary Volume Driver
The commencement of FIFA World Cup 2026 on June 11 has emerged as the undeniable catalyst behind elevated activity across all three platforms.
Kalshi’s championship prediction market for the World Cup has accumulated over $832 million in total wagers. Approximately 35% of participants have backed France as the tournament victor.
On Polymarket, individual match prediction contracts have been generating between $500,000 and $2 million in trading volume per game.
With the World Cup tournament extending through July 19, elevated trading volumes are anticipated to persist for additional weeks.
These robust numbers emerge as prediction market operators face a complex regulatory environment across the United States.
Over a dozen state regulatory authorities have initiated legal proceedings against both Kalshi and Polymarket. State officials claim the platforms provide unlicensed sports wagering or gambling services to their residents.
Both companies, alongside the Commodity Futures Trading Commission, maintain that federal regulatory oversight permits their operation of sports-related markets without requiring state-specific licensing.
This legal dispute continues to unfold and has not dampened trading activity in the near term.
The June combined trading figures mark an all-time monthly high for these platforms, with several weeks of World Cup competition still remaining.
