The index uses the top 100 coins ranked on CMC (excluding stablecoins and wrapped tokens) and compares them based on their rolling 90-day price performances. If 75% of the top 100 coins outperform Bitcoin in the last 90 days, it's Altcoin Season. If only 25% or fewer outperform Bitcoin, it's Bitcoin Season. This calculated number is scaled from 1 to 100 and refreshed on a daily basis.
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