Kalshi Logs Record June Volume as World Cup Lifts Prediction Trading

Prediction markets have found an unexpected new liquidity magnet: the 2026 FIFA World Cup. According to DefiLlama data cited by CNBC, trading volume surged across major US prediction platforms after the tournament began on June 11—at a time when the sector is simultaneously facing intensified regulatory pressure.

DefiLlama shows Kalshi handled nearly $9.4 billion in trading volume in June, up from about $5.3 billion in May. Polymarket International also rose to roughly $4.3 billion in June, compared with about $3.5 billion the month prior. CNBC reported that the World Cup became the biggest driver of prediction market volumes in June, with Dune Analytics highlighting record notional trading activity on both Kalshi and Polymarket.

Key takeaways

• Kalshi’s June trading volume nearly hit $9.4 billion, rising from about $5.3 billion in May, as World Cup activity accelerated.
• Polymarket climbed to about $4.3 billion in June from roughly $3.5 billion in May, also pointing to the tournament as a major catalyst.
• High-stakes World Cup knockout matchups are generating tens of millions in daily volume on both exchanges, with some fixtures surpassing $48 million on Kalshi.
• The growth is unfolding alongside escalating US legal and regulatory disputes over whether prediction markets should fall under federal derivatives authority or state gambling frameworks.

World Cup liquidity floods prediction platforms

The jump in activity aligns with the tournament’s expanded format. The 2026 World Cup is the first FIFA edition featuring 48 teams, up from 32 previously. That increase has effectively created more matches, more outcomes, and more trading opportunities—especially around qualification and match advancement markets.

Knockout-stage matchups appear to be particularly attractive to traders. For example, Canada’s Round of 16 match against Morocco—scheduled for Saturday—had generated more than $48 million in trading volume on Kalshi and over $26.8 million on Polymarket at the time of reporting.

The pattern extends to the US Round of 16. Kalshi’s market on which team advances recorded more than $2.1 million in volume, while a comparable Polymarket market attracted around $1.6 million as of Saturday. While these figures are smaller than the Canada–Morocco matchup, they show how quickly attention can shift between fixtures as brackets lock in.

What matters for market participants is not just overall volume, but where it concentrates. World Cup-related contracts create repeatable, time-bound narratives that traders can model—often with clear deadlines and an intense news cycle. That combination helps explain why notional activity can spike even for markets that are narrower than broad political or macro event themes.

Regulatory pressure rises as trading expands

The World Cup-driven surge is occurring against a backdrop of growing controversy over prediction markets in the United States. Earlier this year, Cointelegraph noted that by March nearly a dozen US states had moved against companies including Kalshi and Polymarket. Some states sought to halt such markets, while others argued they should be brought under existing gambling laws and related tax regimes.

At the federal level, regulators have pushed back. In the following month, CFTC Chair Michael Selig accused states of pursuing what he called “illegal enforcement actions” against federally regulated exchanges. In remarks reported via a CFTC press release, Selig argued that Congress granted the agency sole authority over commodity derivatives markets, which can include prediction markets, warning that any state effort to nullify federal law could lead to court challenges.

This is not merely an abstract legal dispute. For platforms, regulatory uncertainty can influence which contracts can be offered to different users, how product structures are shaped, and what compliance costs may look like in practice. For traders, the risk is that market access could change rapidly depending on court outcomes or agency interpretations.

Congress and Europe weigh in with different approaches

The debate is also expanding beyond regulators and into Congress. In June, casino operators, tribal organizations, and labor groups urged lawmakers to amend the Digital Asset Market Clarity (CLARITY) Act by removing sports-event contracts from the CFTC’s authority. Their argument, as described in Cointelegraph reporting, is that sports contracts should instead remain under state gambling laws and existing gaming oversight.

Europe’s approach is different. In a recent reminder, the European Securities and Markets Authority (ESMA) told firms that many event contracts may already fall under existing restrictions tied to binary options. ESMA’s stance emphasized that whether a product is regulated depends on its characteristics rather than merely the label “event contract.” For market operators contemplating cross-border expansion, that distinction is crucial: product design details, not marketing terminology, can determine regulatory treatment.

Taken together, the picture is uneven. The US environment appears to hinge on jurisdiction—whether prediction markets are treated as commodity derivatives under federal authority or as gambling under state law. In Europe, the focus shifts more toward how the contract functions under binary-options-like rules. These differences can shape where liquidity travels, which venues can scale fastest, and how quickly new market formats can be launched.

What to watch next

With the World Cup supplying an immediate, high-volume catalyst, the key question for investors and builders is whether these trading surges translate into longer-term user growth or just prove how concentrated liquidity becomes during major events. Just as importantly, readers should track how ongoing legal challenges—and potential congressional or European regulatory clarifications—affect market access, contract structures, and the durability of platform volume beyond the tournament.