Bitcoin dominance rebounding, capital rotation intensifying, Aster craze driving alt season index to a seven-year high.

On September 24, 2025, the crypto market entered the countdown to Q4 with one week remaining. Bitcoin's dominance rate (BTC.D) rose by 1.01%, while Ethereum's dominance rate (ETH.D) fell by 2.86%, indicating that funds are flowing back from alts to Bitcoin. The total market capitalization (TOTAL) is only 3% higher than the opening in September. TOTAL2 (excluding Bitcoin's market cap) fell by 4.43%, facing rejection at a key resistance level. The altcoin season index dropped from a high of 100 points after the Aster launch on September 19 to 69 points, and the fear and greed index returned to the “fear” zone. The market has erased 97% of the gains from September, and unlike Q2/Q3, ETH.D continues to decline without support from altcoin rotation, indicating that alts may face a deeper correction in Q4, while Bitcoin remains above the monthly opening price of $108,000 by 3%.

Bitcoin dominance rebounds as capital rotation intensifies

Bitcoin dominance (BTC.D) rose by 1.01% this week, becoming the only indicator above the September low, while Ethereum dominance (ETH.D) fell by 2.86%, clearly showing that funds are flowing back from altcoins to Bitcoin. This rotation is particularly notable ahead of Q4, with the total market capitalization (TOTAL) hovering above the $3.7 trillion monthly baseline by 3%, while the Bitcoin price is only 10.8% above the monthly opening price. Unlike the end of Q2 and the beginning of Q3, when ETH.D nearly doubled to 15% and TOTAL2 rose by 30% with an injection of $510 billion, ETH.D has shown a steady downward trend since its high point of 15% in mid-August. TOTAL2 only peaked at $1.73 trillion, indicating that alts have failed to receive the traditional boost from Ethereum, with funds locked into core assets like Bitcoin. The market fear and greed index has returned to the “fear” zone, erasing nearly 97% of the gains from September, highlighting cautious sentiment among investors.

TOTAL2 encounters resistance, alts under the most pressure

TOTAL2 (excluding Bitcoin market capitalization) fell by 4.43%, with the loss being double that of Bitcoin, facing rejection at a key resistance level, and the altcoin market is hit the hardest. Bitcoin maintains its position, while alts are generally weak, reflecting a rotation fatigue. Ethereum's dominance (ETH.D) continues to decline, further suppressing the capital inflow into the altcoin ecosystem. This dynamic is clearly different from the historical divergence: in past rotation periods, an upward movement in ETH.D often drove explosive growth in TOTAL2, but currently, the decline in ETH.D is causing a lack of engines for altcoins, with capital more inclined towards Bitcoin as a safe haven. This structural divergence serves as a warning for Q4 market positioning, and the upper limit of TOTAL2 may trigger a broader pullback.

Altcoin Season Index Briefly Surges Before Falling Back

Despite ETH.D being out of the picture, the altcoin season index has seen a brief rebound. The index had previously been capped around 80 points, but after the launch of Aster (ASTER) on September 19, funds heavily flowed into altcoins, pushing the index to break through to 100 points, reaching a seven-year high. This trigger stemmed from the speculative frenzy around the Aster ecosystem, briefly igniting market enthusiasm. However, this surge was not sustainable, and the index has currently fallen back to 69 points, only 10% higher than the opening price in September. The core insight is that this is not a true “altcoin season”; recent capital flows have primarily been speculative bubbles. The speculative bubble in small altcoins is accumulating, and the index's decline has reinforced the rotation recession signal, prompting investors to be wary of short-term pullback risks.

Key Observations of Market Divergence in Q4

The current market shows significant divergence: Bitcoin's dominance (BTC.D) rebounding provides support, while TOTAL2 encounters resistance, ETH.D declines, and small altcoin speculative bubbles form, indicating that the altcoin market may face a deep correction. Signs of capital flowing back to Bitcoin have intensified in the week leading up to Q4, and the fear and greed index’s “fear” zone further amplifies uncertainty. Analysts commented that this rotation is different from previous ones, with the weakness of TOTAL2 lacking an upward drive from ETH.D, which may extend the consolidation period for alts. Bitcoin remains stable above $108,000, becoming the core narrative for Q4. Traders should pay attention to whether BTC.D continues to expand to determine the overall market direction.

Conclusion

The crypto market has returned to early September levels before the Q4 threshold, with Bitcoin's dominance rate rebounding, highlighting a preference for safe-haven investments. Meanwhile, TOTAL2 has encountered resistance and the decline of ETH.D exposes the weak rotation of alts, suggesting that speculative bubbles could trigger deeper corrections. This divergence reminds investors that Q4 positioning should focus on the resilience of Bitcoin and the risk balance of altcoins, as opportunities and traps coexist amid market volatility. Disclaimer: This article is for informational purposes only and does not constitute any investment advice. The cryptocurrency market is highly volatile, and investors should make decisions with caution.