Prediction Markets Top $2 Billion Ahead of the 2026 World Cup

The 2026 FIFA World Cup kicks off on June 11, and before a single match has been played, trading on the outcome has already passed $2 billion across the two largest prediction-market platforms. Polymarket's "World Cup winner" market alone has handled roughly $1.8 billion in volume since opening last July, with Kalshi's equivalent market adding more than $100 million — making the tournament one of the largest event markets either platform has ever run.

What a prediction market is

A prediction market lets people trade contracts tied to the outcome of a future event. A contract pays out a fixed amount — typically one dollar — if the chosen outcome happens, and nothing if it does not. The trading price in between works like a live probability: a contract trading at 16 cents implies the market collectively gives that outcome about a 16 percent chance.

That structure is why the markets draw attention beyond bettors. Heading into kickoff, traders price Spain and France as co-favorites at roughly 16 percent each, with England around 11 percent, Portugal near 10 percent, and defending champion Argentina about 9 percent. No team is given even a one-in-five chance — a reflection of how open a 48-team, 104-match tournament is.

Crypto rails under a mainstream event

The two platforms reach the same product from different directions. Kalshi is a US-regulated exchange overseen by the Commodity Futures Trading Commission, while Polymarket runs on crypto infrastructure, settling trades in stablecoins on the Polygon blockchain. For Polymarket especially, the World Cup is a showcase of crypto plumbing serving a mass-market audience that may neither know nor care that a blockchain is involved.

The growth has been steep. Combined monthly trading volume across the two platforms rose from under $5 billion last September to roughly $24 billion in April — a scale that puts prediction markets within range of the roughly $14 billion US-licensed sportsbooks handle in an average month.

The open questions

Growth at this pace invites scrutiny. Regulators and critics continue to debate whether sports-outcome contracts are meaningfully different from gambling, and which rules — securities, commodities, or gaming — should apply. Several US states have challenged sports event contracts offered by federally regulated exchanges, and the legal picture is still being worked out.

There are practical questions, too. A market this large must convince participants that prices cannot be manipulated and that settlement sources are reliable — challenges familiar to bookmakers but newer to platforms that resolve outcomes through decentralized or hybrid processes.

For everyday observers, the probabilities are the useful part: they are a clean, continuously updated summary of what people risking real money collectively believe. Just remember what they are not — a guarantee. A 16 percent favorite loses most of the time.

Sources

• World Cup Betting on Kalshi and Polymarket Surpasses $2 Billion (Yahoo Finance)
• World Cup Winner market (Polymarket)
• Polymarket World Cup Winner Markets Cross $1.8B in Volume (The Defiant)