Key Takeaways:
Prediction markets made up about 27% of US legal sports-betting volume during the 2026 World Cup, up from 9% at the start of the year, according to H2 Gambling Capital.
The Argentina-Spain final contract topped $1.27 billion in trading, the single largest event market in Kalshi and Polymarket history, with total World Cup contracts above $25 billion.
Kalshi drew more daily app users than DraftKings or FanDuel during the tournament, a sign the CFTC-regulated exchanges are taking share from traditional sportsbooks.
Prediction markets moved from the fringe of sports betting to its center during the 2026 World Cup. Trading on Kalshi and Polymarket surged through the tournament, and by the Argentina-Spain final on July 19 the two exchanges had turned a soccer match into the largest event market either has ever run.
H2 Gambling Capital estimated that prediction-market activity reached about 27% of all legal US sports-betting volume during the World Cup, up from 9% at the start of the year, Fortune reported. The comparison is rough because exchanges and sportsbooks count activity differently, but the direction is clear.
The numbers behind it are large. The contract on the final outcome passed $1.27 billion in trading, and total World Cup contracts cleared $25 billion, with Polymarket alone drawing $4.2 billion on the outright-winner market. Kalshi doubled the peak it set a week before the tournament and ran near ten times its early-year levels.
Kalshi also had more daily users on its phone app than either DraftKings or FanDuel, according to Apptopia, and both gambling stocks are down more than 25% on the year. The tournament let Kalshi and Polymarket show how their federal regulator, the Commodity Futures Trading Commission, has let them run betting products and beat back state regulators that sought to shut them down in court.
The growth, Bernstein analyst Ian Moore said, has "put feet to the fire for these traditional sportsbooks."
The exchanges can also take customers in states where sports gambling is banned and serve anyone over 18, unlike sportsbooks capped at 21. That edge is drawing new entrants, from a Robinhood-backed platform to Meta's points-based prediction app Arena, and the same fight is in court as the CME challenges the CFTC's approval of Kalshi crypto perpetual futures. The pattern here is hard to ignore. Prediction markets built for crypto traders are now the fastest-growing corner of American betting.
People Also Ask
How big were prediction markets during the 2026 World Cup?
Kalshi and Polymarket cleared more than $25 billion in World Cup contracts, and the Argentina-Spain final alone topped $1.27 billion, the largest single event market either exchange has run.
Are Kalshi and Polymarket bigger than sportsbooks now?
Not yet, but prediction markets reached about 27% of US legal sports-betting volume during the World Cup, up from 9% in January, and Kalshi out-drew DraftKings and FanDuel on daily app users.
Why are prediction markets allowed to offer sports betting?
They are regulated by the CFTC as event-contract exchanges, which has let them operate in states where sportsbooks cannot and serve anyone over 18 rather than 21.
What is the difference between a prediction market and a sportsbook?
Prediction markets let users trade contracts on outcomes and say they do not profit when customers lose, though the World Cup showed their products increasingly mimic sportsbook bets like parlays.
Sources: Fortune, Bloomberg, H2 Gambling Capital, Apptopia
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