A bet against Spain on Polymarket earned a trader $4.7 million: an analysis of the market anomaly
Analyzing recent events on the decentralized prediction platform Polymarket, I discovered a notable case worthy of close attention from the professional community. A user under the pseudonym fishalive made a seemingly risky bet of $400,000 that the Spanish national team would not defeat Cape Verde in a group stage match of the 2026 FIFA World Cup.
At the time the bet was placed, the odds for this outcome were only 9%, reflecting the extremely low probability the market assigned to such a scenario. However, as subsequent events unfolded, this was an undervalued anomaly. The match ended in a goalless draw — 0:0. Cape Verde, playing its debut match at the World Cup, managed to hold its ground against a giant of world football, despite Spain's total statistical dominance: 75% possession and 27 shots on goal.
As a result, fishalive's position closed with a payout of $4.7 million. This means the trader earned a net profit of approximately $4.3 million, corresponding to a multiplier of over 11x on the initial investment. From the perspective of prediction market analysis, this case demonstrates how low-liquidity or inefficient markets can create opportunities for arbitrage and excess returns, provided there is a deep understanding of fundamental factors.
Expert commentary: This case is a classic example of how market psychology and the overvaluation of favorites create pricing distortions. The investor likely analyzed not only the opponent's strength but also the specifics of the tournament, the debutant's motivation, and the psychological pressure on the favorite. Polymarket continues to prove that decentralized prediction markets can be not just a tool for entertainment but also a full-fledged environment for high-yield strategies, where information and analysis are worth more than team reputations.