January was a historic month for prediction markets, with sports betting being the catalyst for this growth. Of the $17.3 billion in total trading volume on the two major platforms, @Polymarket and @Kalshi, sports betting accounted for a significant 51% ($8.8 billion), becoming the primary driver of growth. This impact is clearly reflected in the data: monthly trading volume in prediction markets surpassed $27 billion, a 47% increase ($8.7 billion) from December, with both trading volume and open interest exceeding 100 million and $1 billion for the first time, respectively. January also saw the first time daily trading volume exceeded $1 billion, reaching this figure multiple times. User behavior is shifting towards prediction markets primarily driven by sports events, indicating the emergence of a more mainstream and repeatable demand pattern. Thanks to @artemis for providing the information.