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World Cup fever has pushed trading volume for Polymarket’s football prediction market up by 300%, while Kalshi’s open interest has topped $1 billion for the first time.

2026.06.24 23:45:25

Driven by the World Cup, Polymarket's "Soccer" category saw trading volume exceed $2 billion in the first 10 days after the tournament kicked off, a 300% increase from the prior 10-day period. Meanwhile, the category's average daily trading volume rose from $53 million in the month before the World Cup to roughly $220 million so far during the event. Kalshi has also benefited from the World Cup hype. Data shows that Kalshi's aggregate open interest hit $1.16 billion last Thursday, a new all-time high and the first time the platform's open interest has crossed the $1 billion threshold. Year-to-date, Kalshi's open interest has grown by 350%. However, Polymarket's open interest has remained relatively stable during the World Cup; its open interest for its CFTC-regulated U.S. business has only seen modest growth, failing to reach its April 2026 high. In contrast, Kalshi's open interest has grown faster than its trading volume, indicating its users hold positions for longer periods and are starting to take larger directional bets, rather than just engaging in short-term trading.

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