Kalshi's aggregated OI reached a record $1.16 billion last week, the first time the platform’s OI surpassed the billion-dollar mark.

Kalshi's aggregated OI reached a record $1.16 billion last week, the first time the platform’s OI surpassed the billion-dollar mark.

Polymarket's World Cup trading volume surged 300% past $2 billion while Kalshi's open interest hit a record $1.16 billion during the 2026 FIFA tournament.