Bitcoin’s share of the cryptocurrency market has slipped to roughly 58.6% as October begins, extending a retreat from the 60% area while a broader group of altcoins improves against BTC. The decline in Bitcoin dominance points to a wider distribution of market value, but the major altseason indicators are not yet giving the same signal. CoinMarketCap’s live dashboard showed Bitcoin dominance at 58.6% and its Altcoin Season Index at 61 out of 100 on October 1.
Crypto analyst Niklas Theisen highlighted the 61 reading after the index spent portions of September around 45 to 53. CoinMarketCap classifies altcoin season only when at least 75% of the top 100 eligible assets outperform Bitcoin over the preceding 90 days. A reading of 61 therefore shows improving relative breadth without confirming a full altcoin season. Bitcoin was trading near $83,400, while the total crypto market capitalization stood around $2.86 trillion after briefly moving above $3 trillion during September.
Crypto Market Snapshot | 2026-09-30
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🔵 LowFear & Greed Index 😨😈
😈 68 – GreedBitcoin Dominance 👑
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⚪ 61/100 – Neutral$BTC #Bitcoin #Altcoins #Crypto— Niklas Theisen (@NiklasTheisen) September 30, 2026
Altcoin Market Value Expands as Bitcoin Share Falls
The shift has been building since August. The combined value of altcoins reached approximately $1.19 trillion on September 22, its highest level since late January and about 33% above August 19. That expansion shows altcoins gaining substantial dollar value, although rising market capitalization does not by itself prove that capital is directly rotating out of Bitcoin. Relative strength has also been uneven, with assets such as Avalanche briefly outperforming several large-cap peers before reversing part of the move.
Glassnode has provided a stronger altcoin signal through a different methodology. Its Altcoin Cycle Signal, based on the top 250 altcoins excluding stablecoins, reached 81.25 on September 22, above its 75-point altseason threshold. That reading should not be conflated with CoinMarketCap’s 61 because the two indicators use different universes and methodologies. Glassnode’s latest accessible reading has since eased back to 75, putting the metric directly on its altseason boundary.
Individual assets have also diverged sharply. Zcash, for example, has produced unusually strong Bitcoin-relative performance, with ZEC separating from much of the large-cap altcoin market. Such concentrated winners can lift altcoin-performance indicators without establishing that the entire market is moving together, making breadth important when interpreting any single altseason gauge.
Derivatives Give a More Complicated Rotation Signal
Altcoin perpetual-futures open interest surpassed Bitcoin’s on September 6 for the first time since December 2024, with BTC perpetual open interest around $23.9 billion at the time. That crossover demonstrated growing derivatives exposure outside Bitcoin, but open interest measures outstanding positions rather than bullish capital flows and does not reveal whether traders are long or short. Zcash’s unusually large derivatives positions also contributed materially to the change.
More recent Glassnode analysis complicates the idea that leverage is driving the broader move. As of September 23, 72.5% of tracked altcoins had outperformed Bitcoin over the previous week, yet perpetual open interest measured in native tokens had barely expanded over 30 days. Glassnode characterized the latest advance as predominantly spot-driven, which reduces the evidence for a market-wide leveraged altcoin chase.
That distinction also makes earlier $80 million liquidation headlines a poor measure of altcoin fragility: the September 24 event primarily involved leveraged Bitcoin longs rather than a broad altcoin unwind. Meanwhile, listed fund flows have periodically favored Bitcoin even as altcoins strengthen, including sessions where Bitcoin ETFs attracted capital while altcoin funds recorded redemptions. The current picture is therefore one of broader altcoin participation, not a clean migration of capital away from Bitcoin across every market channel.
Bitcoin dominance near 58.6%, a CoinMarketCap index at 61 and Glassnode’s stronger but recently softer signal all point in the same general direction without describing the same market state. Altcoins have gained ground, but the evidence still looks more like an expanding rotation than the broad, synchronized altcoin booms associated with previous cycle extremes. Whether that breadth continues to spread across sectors will matter more than Bitcoin simply remaining below the psychologically convenient 60% line.