Altcoin Season Index — Top 50 vs BTC 90-Day Performance
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Altcoin Season Index — Top 50 vs BTC 90-Day Performance
Computes the Altcoin Season Index: what % of top-50 coins outperformed BTC over 90 days. Returns per-coin comparison, beat/miss flag, and aggregate score. Score ≥75 = altcoin season, ≤25 = BTC season. No API key required.