Total open interest across crypto-native prediction markets climbed to $1.8 billion in June, up 54.3% month-over-month. The surge lines up almost exactly with the start of the 2026 FIFA World Cup on June 11, with event-driven trading providing the fresh bid.
Why it matters
Kalshi is the clear share leader, holding $1.2 billion in open interest, or 66.7% of the total, after a 91.9% monthly increase. The gap between Kalshi and the rest of the field matters: prediction markets remain a winner-take-most category, and the World Cup catalyst is disproportionately rewarding the incumbent venue. Concentrated OI on a single platform also concentrates the regulatory and operational risk if volume reverses once the tournament ends.
Market impact
The World Cup is doing for prediction markets what the 2024 election cycle did for the category's first institutional moment: pulling in a wave of new users, pricing in real-world outcomes at scale, and validating the venue model for retail. Whether $1.8B is a durable floor or a tournament-driven peak is the open question. Post-July OI prints will be the first real test of how much of this flow is sticky once the headline catalyst fades.
Source: [source](http://telegraph.controller.bot/files/8336652911/AgACAgIAAxkBAAI87mo-Yp47q7KRMLnq99xGlTgt3XYKAAKZG2sbNsTwSV4UoyWow3FzAQADAgADeQADPAQ)
Frequently asked questions
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What is the current total open interest across prediction markets?
Total prediction market open interest reached $1.8 billion in June, up 54.3% month-over-month, with the World Cup 2026 identified as the main catalyst.
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How much of the open interest does Kalshi control?
Kalshi holds $1.2 billion in open interest, a 66.7% share of the total, after a 91.9% monthly increase.
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Why did prediction market OI jump in June 2026?
The 2026 FIFA World Cup began on June 11, and the timing lines up with the surge in event-driven trading across prediction venues.
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Is the open interest growth likely to last after the World Cup ends?
That is the open question. Post-tournament OI prints in July and August will determine whether $1.8B is a durable floor or a catalyst-driven peak.
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What does the concentrated OI on Kalshi mean for the category?
Kalshi's 66.7% share shows prediction markets remain winner-take-most. It also concentrates operational and regulatory risk on a single venue if flow reverses once the World Cup cycle ends.
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