The Altcoin Season Index from Blockchain Center has slipped to 65 points, falling below the critical 75-point threshold that signals an official altcoin season - when the majority of major tokens outperform Bitcoin. Just 11 days ago, on September 11, the index hit a high of 78, the highest since December 2024, sparking optimism among traders.
According to the Blockchain Center’s methodology, an altcoin season is confirmed when at least 75% of the top 50 coins (excluding stablecoins and asset-backed tokens) outperform Bitcoin in returns over the past 90 days. Currently, this criterion is not met. The decline is further supported by CoinMarketCap’s index, which dropped from 67 to 61, reinforcing the shift away from altcoin dominance.
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Bitcoin’s dominance has also strengthened, with TradingView data showing the BTC.D index rising by approximately 1.5% this morning to 58.8%—the highest level this September. Among the tokens with the poorest performance over the last 90 days are PI, ICP, WBT, APT, TAO, XMR, TON, and PEPE, highlighting a challenging period for these assets.
This downturn raises questions about whether the brief altcoin rally was a fleeting surge or a sign of deeper market shifts, with Bitcoin reclaiming its lead for now.
