The Altcoin Season Index has dropped to its lowest level since July. According to Blockchain Center, as of 13:00 Moscow time on December 15, it stands at 33 points, and on Friday, December 11, it fell to 31 points.
The Altcoin Season Index from Blockchain Center is a metric that compares the 90-day return of the top 50 cryptocurrencies by market cap (excluding stablecoins and wrapped tokens) to Bitcoin. The indicator is expressed in values from 0 to 100. If 75% of the coins on the list show greater growth than Bitcoin, it is considered an altcoin season (75 points); if less than 25%, it is Bitcoin's season.
Over the past six months, the index remained in the altcoin season zone for less than two weeks in September. During this period, the indicator reached 80 points for the first time in 2025. A number of leading tokens hit all-time highs during this time; for example, on September 18, Binance's BNB rose above $1,000 for the first time. Over the past three months, the altcoin season index has fallen from 80 to 33.
Over the past 90 days, among the cryptocurrencies included in the Blockchain Center index, ZCash (ZEC) stands out significantly from the others with its performance. Its three-month return is 686%, while the token in second place, WBT, has a return of 38% over this period.
Bitcoin is in 17th place with a three-month loss of 22%. But most of the leading coins are in an even greater decline. Ethereum is in 22nd place (-29.8%), Solana (SOL) is in 36th place (-43.9%), and Ton is in 40th place (-50%). The token with the lowest return was PUMP, which fell 66% over 90 days.
The Blockchain Center's Altcoin Season Index is considered canonical for the market, but other analytical platforms also conduct their own measurements. A similar index from CoinMarketCap, which considers the top 100 cryptocurrencies, fell to 19 points on December 15.
Another indicator that may signal the approach or retreat of an altcoin season is Bitcoin's market share (dominance). Its decline is interpreted by traders as a move towards an 'altcoin season,' and vice versa.
But over the past three months, Bitcoin's dominance has not changed significantly. According to TradingView, on September 15, BTC's share of the crypto market was 58.17%, and today it is 59.13%. Throughout this time, the index has fluctuated within a narrow range of 57.6% to 60.6%.
On December 15, the price of Bitcoin is fluctuating around $90,000. From its peak of around $126,000, recorded on October 6, the coin has fallen by 28.8%.
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