Polymarket US open interest has reached $111.4 million, nearly doubling since the 2026 World Cup ended in July. The platform now accounts for 54% of total Polymarket volume, despite only launching in December 2025. Unlike the broader prediction market sector, which saw a 20% decline in open interest after the tournament, Polymarket US continued climbing. The platform operates with fiat USD contracts and full KYC compliance, unlike the original crypto-native version. While Kalshi still dominates in absolute terms with approximately $1.5 billion versus $111.4 million for Polymarket US, the trend is reversing: Kalshi’s open interest is declining while Polymarket US’s is rising.
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