Polymarket Corners The World Cup Bet While Kalshi Quietly Wins Fees

Polymarket's World Cup winner market has drawn $2 billion in lifetime bets, while rival Kalshi spreads the same wager across 48 smaller books and pockets most of the fees.

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Polymarket Pools World Cup Cash

Traders have funneled $2 billion into Polymarket's tournament winner market, which carried $436 million in standing liquidity and turned over $137 million last Thursday, figures reported this week show. The platform's wider World Cup section now spans more than 330 active markets, and Thursday's flow alone nearly matched Kalshi's biggest book over its lifetime.

Kalshi runs the same event very differently. It has gathered $182.3 million across 48 separate contracts, and on the largest listed events Polymarket's lead stretches close to 11 to one. Both venues priced the football alike, with Spain the favorite at 17% and matching 5.56 times payouts on the leaders.

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Kalshi Banks The Bigger Fees

Polymarket wins the headline number, yet Kalshi quietly wins the money that matters. The regulated platform took 58% of the sector's record $31.2 billion in May, against Polymarket's 28%, pushing industry open interest to $1.3 billion.

Sports trading drove $10.44 billion of that flow, roughly 60 times what Kalshi's famous elections markets managed, while crypto added $2.02 billion. Fees tell the sharper story. Kalshi booked $137.86 million in May, against Polymarket's $28.07 million, a revenue gap of nearly five to one.

So the contest is breadth against depth, with Kalshi scattering cash over dozens of match-level books while Polymarket pools it in one giant tournament market. Outside analysts projected a $5 billion to $10 billion jump in consumer volume from the event, calling it a watershed for the young prediction sector.

World Cup Reshapes Prediction Bets

The football boom is not a passing tournament spike. Sports topped every category on Polymarket through 2026, claiming $6.20 billion of January's $14.34 billion before peaking in March at $8.77 billion of a record $19.58 billion month.

By this month total volume had slid about 70% to $5.91 billion, yet the sports share still climbed to 56.5%.

The shift runs deeper than one platform. Smaller venue Opinion saw sports swell to 99.4% of its activity by early June, while crypto bets there fell below $500,000. Crypto had led that same venue in January, when it cleared $729.52 million in a single week.

A year ago, elections and coin prices carried these markets. The World Cup did not just lift prediction trading, it replaced the very categories that built it.

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