Data: Kalshi and Polymarket's trading volume in November totaled nearly $10 billion, both setting historical highs

According to The Block, the prediction market platforms Kalshi and Polymarket both set monthly trading volume records in November.

Data from The Block shows that Kalshi's spot trading volume in November increased from $4.4 billion in October to $5.8 billion, a month-over-month growth of 32%. Polymarket also performed strongly, with November trading volume rising from $3.02 billion in October to over $3.7 billion, a month-over-month increase of 23.8%.

The combined trading volume of the two platforms in November approached $10 billion, continuing the record-breaking activity since the summer. Market share data indicates that Kalshi and Polymarket currently dominate global prediction market traffic, forming a rapidly consolidating duopoly.