Altcoin Season Index Slumps to 27, Cementing Bitcoin Season
The Altcoin Season Index has fallen further to 27, down from 34 and 59 in recent weeks. This index, tracking the performance of the top 100 altcoins against Bitcoin over the past 90 days, peaked at 87 in December 2024 and hit a low of 12 in April 2025. Readings below 75 indicate altcoin underperformance, and levels under 25 confirm a Bitcoin Season. The slide to 27 highlights Bitcoin’s outperformance as Bitcoin fell 7.7% initially then 9.7% more recently, while most altcoins posted losses. Standout gains include MYX (+3975%), ASTER (+1461%), ZEC (+514%) and M (+468%). Leading tokens BNB (+73.9%) and ETH (+25%) outperformed some peers, but GT (-9.1%), DEXE (-8%) and LINK (-7.9%) lagged. Gold-backed tokens PAXG (+26%) and XAUt (+25.8%) bucked the trend. Overall, trading momentum is shifting toward Bitcoin dominance and safer assets as altcoin gains narrow.
Bearish
The continued decline of the Altcoin Season Index to levels below 25 confirms a Bitcoin Season, signaling a shift in trader preference toward Bitcoin and safer assets. In the short term, this trend may pressure altcoin prices as capital rotates out of smaller tokens, leading to increased volatility and underperformance. Conversely, Bitcoin’s relative strength could attract more inflows, supporting its price. In the long run, sustained dominance by Bitcoin may dampen speculative interest in altcoins, but periods of consolidation could pave the way for selective altcoin rallies once market sentiment stabilizes.