Prediction market open interest climbed to a record $1.48 billion in the week ending June 15, roughly a sixfold increase over the past year.
Open interest was not the only milestone. Notional volume, weekly fees, and active users all hit new highs as the FIFA World Cup pushed sports betting sharply higher.
According to a16z crypto, it was the second consecutive weekly peak. Kalshi and Polymarket account for most of the figure. Smaller venues such as Opinion, Limitless, and Myriad trail well behind.
The post explained that, unlike trading volume, which measures daily churn, open interest tracks the capital that participants keep deployed and at risk. The sustained climb shows traders holding longer-term positions across politics, economics, culture, and crypto.
Follow us on X to get the latest news as it happens
The growth extended beyond open interest. Dune data showed weekly fees reached a record $76.8 million, while active users climbed to an all-time high of 426,975.
Sports became the dominant force behind the latest surge. Total notional volume across prediction markets hit a record $12.2 billion during the week.
Notably, sports-related markets account for $5.8 billion, nearly half of the total. The segment was the largest volume driver on both Polymarket and Kalshi.
The ongoing 2026 FIFA World Cup has played a key role in attracting new participants to these platforms. Betting activity has intensified significantly, with some users placing seven-figure wagers on individual matches. In one notable case, a trader reportedly generated $9.24 million in profits in a single day.
Subscribe to our YouTube channel to watch leaders and journalists provide expert insights
Read the Original story Prediction Market Open Interest Hits Record $1.48 Billion as Sports Bets Climb by Kamina Bashir at beincrypto.com