Combined trading volume across the two largest prediction-market platforms surged 75% in June to $44.8 billion, a record for the sector, as the FIFA World Cup pulled a wave of event-contract activity onto Kalshi and Polymarket. The month tested whether prediction-market infrastructure could sustain trading around a single global event – and, by the volume figures, it did just that.
Key Takeaways
Kalshi, Polymarket, and Polymarket U.S. traded a combined $44.8B in June, up 75% from May’s $25.66B.Kalshi took the largest share at $31.5B, roughly 70% of the total, growing 87% month over month. Trading volume is not money staked – contracts are resold repeatedly, so the figure overstates funds at risk.Whether June’s level marks a durable shift or just a World Cup spike is the key question of the coming months. For sports fans, there is always going to be something to follow and trade on.
