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What Is the Altcoin Season Spectrum?
The Altcoin Season Spectrum is a continuous -100 to +100 scale measuring whether altcoins or Bitcoin are leading the market, with breakdowns by market cap cohort: large-cap, mid-cap, small-cap, and DeFi tokens.
Unlike CoinMarketCap’s binary Altcoin Season Index (which simply says yes or no), the Spectrum provides nuance — showing which segments of the altcoin market are outperforming and by how much.
How to Read the Spectrum
- +70 to +100: Extreme Altcoin Euphoria — nearly all alts beating BTC
- +30 to +69: Altcoin Season — clear altcoin outperformance
- -29 to +29: Neutral / Choppy — no clear leader
- -69 to -30: Bitcoin Season — BTC outperforming most alts
- -100 to -70: Extreme Bitcoin Dominance — almost nothing beats BTC
Calculation Methodology
For each cohort (large-cap top 10, mid-cap 11-50, small-cap 51-200, DeFi top 30), we calculate the percentage of coins outperforming Bitcoin over a trailing 30-day window. This is then normalized to the -100/+100 scale where 50% outperforming = 0 (neutral).
The overall score is a weighted average: Large Cap (40%), Mid Cap (25%), Small Cap (20%), DeFi (15%). The heavier large-cap weighting reflects institutional flow patterns.
Stablecoins and wrapped tokens are excluded from all calculations.
Data Sources
- CoinGecko API — Top 250 coins by market cap with 30-day price change data
- CoinGecko Categories — DeFi category data for the DeFi cohort
Updated every 15 minutes. Historical data available via our public API.
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