In September, the combined trading volume of Kalshi and Polymarket reached $1.44 billion, setting a new record.

Jinse Finance reported that last week, the prediction market continued to gain momentum, with both Kalshi and Polymarket announcing new rounds of financing. Polymarket raised $2 billion from Intercontinental Exchange (ICE), bringing the platform's valuation to $9 billion; Kalshi raised $300 million at a valuation of $5 billion. These two rounds of financing have produced at least one new billionaire. According to Bloomberg, Shayne Coplan of Polymarket became the youngest self-made billionaire following this round of financing. In September, Kalshi's market share once peaked at 60%—a significant reversal from earlier this year when Polymarket dominated trading activity. During September, the combined trading volume of these two platforms reached $1.44 billion, setting a new historical record.