A trader placed two bets on the FIFA World Cup and walked away with $8.47 million profit in a single day on Polymarket

A trader using two freshly created wallets staked $9.45 million across two FIFA World Cup fixtures on Polymarket and walked away with $8.47 million in profit in a single day, with both winning positions hinging not on a team winning, but on a match ending level.

According to onchain analytics firm Lookonchain, the trader opened a new wallet the day before placing the bets and put $7.19 million on Sweden not to lose against Japan.

The match ended 1-1, paying out approximately $4.38 million. The same trader then staked $2.26 million on Ecuador to beat Germany, with that result delivering the remaining profit and bringing the combined single-day haul to $8.47 million.

The trades illustrate a pattern that has defined World Cup activity on Polymarket in recent weeks: large positions placed on specific match outcomes, often resolved by a single goal or a scoreline that defies pre-match odds.

The week that minted and erased fortunes

Last week, a trader using the handle “fishalive” converted a $400,000 bet into a $4.7 million payout by correctly wagering that Spain would not beat Cape Verde, an outcome the market had priced at just 9% probability before kickoff. The two sides drew in what observers called one of the tournament’s most striking results.

The same result that made fishalive’s fortune destroyed another trader’s position. That bettor lost nearly $1 million on a single Spain wager as the Cape Verde draw landed. A separate trader lost approximately $4.2 million across two consecutive positions within 24 hours, first on the Netherlands to beat Japan, which ended 2-2, then on Belgium over Egypt, a match that slipped away on an own goal.

The platform behind the volume, and the breach

The concentration of high-value World Cup trades on Polymarket has sharpened the platform’s profile at a complicated moment. The same week the $8.47 million trade drew attention, Polymarket disclosed that hackers had stolen approximately $3 million from users through a compromised third-party vendor.

The company said it had contained the breach and is actively refunding affected users, but has not publicly identified the vendor involved or detailed how the compromise occurred.

Polymarket and rival Kalshi have together driven a record stretch for the prediction market sector, with monthly trading volume reaching tens of billions of dollars earlier this year. Sports betting, led by World Cup fixtures, has emerged as one of the primary volume drivers alongside political and macroeconomic markets.

The scale of individual positions now routinely placed on Polymarket reflects how far the platform has moved from its origins as a niche political forecasting tool. Single-match stakes in the millions have become a regular feature of major tournaments, with each unexpected result producing traceable wins and losses that circulate quickly through crypto trading communities.

Whether the $8.47 million single-day figure holds as a tournament record will depend on how the knockout rounds unfold, and on whether Polymarket’s security disclosures affect trader confidence in the weeks ahead.