According to BlockBeats, the Altcoin Season Index, as reported by Coinmarketcap, currently stands at 17. This marks a significant drop from its previous high of 78 on September 20. The average index value last week was 21. The index indicates that over the past 90 days, approximately 17 out of the top 100 cryptocurrencies by market capitalization have outperformed Bitcoin.

The CMC Altcoin Season Index is a real-time metric used to assess whether the cryptocurrency market is currently experiencing a season dominated by altcoins. It is based on the performance of the top 100 altcoins relative to Bitcoin over the past 90 days.