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Altcoin Season Index

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What fraction of the top alts has outperformed BTC over the trailing 90 days.

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What this chart shows
Methodology

For each day t we compute every tracked altcoin's 90-day return and compare against BTC's 90-day return on the same day. Index_t = (#alts that beat BTC) / (#alts evaluated). Stables and wrapped BTC (USDT/USDC/DAI/WBTC etc.) are excluded. ITC convention: > 75 % = Altcoin Season, < 25 % = Bitcoin Season.