Global cryptocurrency markets have shifted decisively; CoinMarketCap’s Altcoin Season Index fell to 33, marking Bitcoin outperformance. The move suggests a market structure where Bitcoin maintains leadership while altcoins lag on a rolling 90-day basis. Analysts note that this reading reflects market structure, not a price forecast, highlighting sector rotation within the altcoin sector and lower volatility than Bitcoin.
The Altcoin Season Index compares the 90-day performance of the top 100 cryptocurrencies against Bitcoin, excluding stablecoins and wrapped tokens. An official altcoin season triggers only when 75% of those assets outperform Bitcoin in that window. The index aggregates daily percentage changes to determine how many assets beat Bitcoin’s returns. The decline to 33 follows a period of consolidation after the previous year’s post-halving volatility.
Historically, readings below 50 have correlated with capital rotation into Bitcoin and select large-cap altcoins rather than broad altcoin rallies. Analysts say past behavior suggests extended periods in the 25–50 range can last for months, with on-chain activity guiding selective accumulation. Investors should view this metric as a framework for market-cycle positioning and risk, not a price forecast.
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