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. The World Cup-induced growth spurt continues Kalshi, combined with Polymarket’s international platform and its U.S.-regulated exchange, recorded a combined $44.8 billion in monthly trading volume in June. This marks a 75% jump from May’s $25.66 billion, according to The Block’s data dashboard. Kalshi drove most of the …

