A Polymarket trader known as 'fishalive' turned approximately $427,000 into over $4.7 million by betting against Spain in their 2026 World Cup match against Cape Verde. Before the game, Polymarket odds for Spain to win were above 90%, but the trader bought 'No' shares at 9% odds, wagering about $427,952. After Spain failed to secure a victory, the payout reached $4,702,769.23, making it one of the largest single trades on the platform. The match, played on June 15, 2026, marked Spain's debut in the 48-team World Cup hosted by the US, Mexico, and Canada. Cape Verde, a debutant, managed at least a draw, causing shockwaves in the football and prediction market communities. The trade highlights the potential of prediction markets like Polymarket, where contrarian bets can yield massive returns. It also underscores the risks of heavily favored teams failing to perform, a reminder that factors like opponent motivation and weather can disrupt expectations. Polymarket has seen billions in volume during the World Cup, and such viral trades continue to attract new users.

Key facts

• Trader 'fishalive' turned $427K into $4.7M by betting Spain would not beat Cape Verde.
• Polymarket odds for Spain win were >90%, but the trader bought 'No' shares at 9%.
• Spain's failure to win in their World Cup debut caused a massive upset.
• Trade is one of the largest single bets on Polymarket during the 2026 World Cup.
• Contrarian bets highlight prediction market potential for huge returns.