The World Cup drove the prediction market's open interest to 1.8 billion. Kalshi really feasted on this wave of sports traffic, while Polymarket still sticks to its political base.

Coin World News, according to the 2026 Q2 prediction market report released by Cryptorank, the open interest in the prediction market reached $1.8 billion by the end of June, up 54% from a month ago, mainly driven by the start of the FIFA World Cup. The report states that Kalshi has taken the lead in metrics such as open interest and trading volume, while Polymarket still maintains its dominance in the political prediction market. Excluding the sports market, the latest weekly trading volume in the prediction market reached $3.1 billion, with Kalshi at $2.6 billion and Polymarket at $492 million. Cryptorank also noted that the prediction market was the crypto category with the highest financing amount in the first half of 2026, attracting a total of $1.85 billion, accounting for 26% of the total financing for the top ten categories.