In the lead-up to the World Cup final, significant activity has been observed in prediction markets, particularly on platforms like Kalshi and Polymarket. As of mid-day Friday, July 17, 2026, the contract for the Argentina–Spain final has already surpassed $1.27 billion in trading volume. This surge in betting activity reflects a growing interest in sports prediction markets, with the Spanish team currently favored to win with 61% odds against Argentina, led by Lionel Messi. The total trading across World Cup contracts has exceeded $25 billion, dwarfing other major sports events such as the NBA finals and the Super Bowl.
Polymarket has also reported a notable increase in user engagement, with the Argentina–Spain contract reaching nearly $3 million in trading volume. More than 64,000 users have interacted with the match page just three days before the final, indicating a robust market liquidity. The World Cup Winner market on Polymarket has generated $4 billion in cumulative trading volume since its launch in July 2025, making it the largest single market in the platform's history, surpassing even the 2024 U.S. presidential election.
Despite the impressive trading volumes, the accuracy of these prediction markets in forecasting match outcomes has been mixed. For instance, in the closely watched semifinal matchups, early market pricing did not align with the eventual results. Both Kalshi and Polymarket initially gave a 10% edge to the teams that ultimately lost, highlighting the unpredictability of sports outcomes. The volatility in odds was particularly evident in the England vs. Argentina match, where the odds fluctuated based on the scoreboard.
As the tournament progresses, the popularity of these platforms is reinforcing their ascent in the United States, where they are becoming an accessible way for users to trade on real-world outcomes. The ability to place small bets directly from mobile devices across various markets, including sports and politics, is contributing to the growing interest in prediction markets. This trend suggests a shift in how individuals engage with sports events, as they seek to leverage their insights and opinions through betting.
