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Altcoin Season Index: Rotation or False Start?
Top altcoins are outperforming Bitcoin after Hyperliquid's ATH and ETH recovery. The Altcoin Season Index signals rotation; confirmation requires falling BTC dominance and rising stablecoin inflows.
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The idea of an altcoin season is gaining traction. Over recent sessions, a broad set of the top 100 cryptocurrencies by market capitalization have outperformed Bitcoin (BTC). Hyperliquid reached a new all-time high. Ethereum (ETH) reversed weeks of weakness into a firm bid. The Altcoin Season Index – which tracks whether the majority of top altcoins are beating BTC over a 90-day window – is moving into rotation territory. The question is whether this is a durable regime shift or a crowded squeeze on thin liquidity.
What the Altcoin Season Index Actually Captures
The Altcoin Season Index compares the price performance of the top 100 altcoins (excluding stablecoins and wrapped tokens) against Bitcoin over a rolling 90-day period. When 75 percent of those altcoins outperform BTC, the index signals an alt season. When fewer than 25 percent do, it signals Bitcoin dominance. Current readings sit between those thresholds. The compression of BTC dominance from the mid-50s to below 52 percent suggests capital is rotating out of the largest crypto.
The naive interpretation is simple: altcoins are rallying, so alt season must be here. The better market read is more layered. Altcoin rallies often build on thin order books and lower exchange flows. Liquidity conditions matter far more here than for BTC. If the rally is backed by fresh stablecoin inflows rather than mere rotation out of BTC, it has higher odds of persistence. Without that inflow, the move can unwind in hours as fast money exits.
Hyperliquid's New High and Ethereum's Recovery
Hyperliquid stands out because it hit an all-time high during a period when many large-cap altcoins were still far below their previous cycle peaks. That divergent strength can attract traders looking for beta. It also raises the risk of a sharp reversal if the broader outperformance stalls. Hyperliquid's market cap is small relative to the top ten, so its move alone does not confirm a macro rotation. It does, however, signal that high-conviction capital is chasing specific narratives – in this case, perpetual DEX infrastructure – rather than buying the whole altcoin basket.