Kalshi Adds 3 Million Users During World Cup Boom

The 2026 FIFA World Cup proved to be a game changer for Kalshi, with the prediction market platform revealing that the tournament attracted 3 million new users and generated record trading activity across its markets.

According to the company, more than $1.2 billion was traded on its World Cup winner market alone, making it the largest single prediction market in Kalshi's history. The boost helped push overall platform activity to new highs as interest in event contracts continued to grow throughout the tournament.

World Cup Delivers Record Growth

Football's biggest tournament became Kalshi's busiest event to date, with millions of users joining the platform as fans traded on match results and tournament winner markets.

The company said the World Cup brought in three million first time users, showing the bigger interest in prediction markets during major sporting events. Trading volumes climbed in a fast rate as the tournament progressed, ending in record activity during the final.

Kalshi has increasingly positioned itself as an alternative to traditional sportsbooks, allowing users to buy and sell event contracts instead of placing conventional sports bets. That model has come under growing legal scrutiny in several U.S. states, but it has also helped fuel the platform's fast expansion.

Prediction Markets Continue to Gain Ground

The World Cup wasn't just a milestone for Kalshi. The tournament also highlighted the growing popularity of prediction markets, with billions of dollars traded across the sector during the month long competition. Some industry estimates suggest prediction markets captured a significant share of overall legal sports betting activity during the event.

Kalshi said the influx of new users and higher trading volumes is showing an increasing demand for event based markets, particularly during globally watched sporting events.

Momentum Continues Despite Legal Challenges

The record breaking figures come as Kalshi continues to defend its sports event contracts in courts across the United States.

The company is involved in legal challenges with several states over whether its sports markets should be regulated by the Commodity Futures Trading Commission (CFTC) under federal law or treated as sports betting under state gambling laws. Despite those challenges, Kalshi has continued expanding its product offering and user base.

For now, the World Cup has provided the platform with its biggest boost yet, giving Kalshi millions of new users and demonstrating how major sporting events are helping bring prediction markets into the mainstream.