According to BlockBeats, data from Coinmarketcap indicates that the Altcoin Season Index is currently at 25, a decrease from its previous high of 43 on May 10. This index reveals that in the past 90 days, approximately 25 out of the top 100 cryptocurrencies by market capitalization have outperformed Bitcoin.
The CMC Altcoin Season Index serves as a real-time indicator to assess whether the cryptocurrency market is experiencing a period dominated by altcoins. It is based on the performance of the top 100 altcoins relative to Bitcoin over the last 90 days.