The cryptocurrency market is showing signs of a shift in sentiment: the key Altcoin Season indicator from CoinGlass has settled at 58. After a sharp jump to 64 on June 4, the index has corrected somewhat but remains in a zone indicating a revival of altcoins.
The CoinGlass metric assesses what share of the top 50 assets by market capitalization has outperformed Bitcoin over the last 90 days. The index scale ranges from 0 to 100, with a value above 75 traditionally considered the official start of a full altcoin season. The current level of 58 points is a notable step forward compared to the neutral zone, though it is still far from the consensus threshold.
BTC Dominance Under Pressure
The rise in the index coincides with a change in market structure. According to CoinGecko, Bitcoin's share stands at around 57%, but CryptoRank's analysis shows a sharper decline: from 58.12% at the start of July to approximately 54% by mid-month, with a subsequent recovery to 56.3%. Over the same period, the share of altcoins (excluding BTC, ETH, and stablecoins) grew from 19.39% to 24.68%. This suggests that capital is indeed beginning to migrate into a broader range of assets.
Interestingly, Bitcoin's own dynamics strengthen the case for rotation. In recent weeks, BTC dominance has tested key support levels. Some traders rightly believe that a break of these levels could be the trigger for a full altcoin season.
Not All Signals Are Clear-Cut
However, conclusions should not be rushed. The difference between the CoinGlass (58) and CoinMarketCap (53) indices is a common occurrence, driven by different methodologies and selection criteria. Moreover, Glassnode analysts have previously warned: the current altcoin revival signal may be caused not by their own outperformance, but by a sharp drop in Bitcoin.
The market is seeing selective, rather than broad-based, rotation. Capital is mainly flowing into high-yield tokens and the Solana ecosystem, while selling among small-cap projects is intensifying. Institutional investors paint a more positive scenario: in mid-June, ETF flows turned toward altcoins—fresh capital went into products based on Ether, Solana, and XRP, while Bitcoin funds recorded outflows.
My analysis: The rise of CoinGlass to 58 and the weakening of Bitcoin's dynamics relative to its overall market share are important, but not final, signals. Further movement toward the 75 mark will largely depend on whether BTC dominance continues to decline through the end of July. If this happens, we will witness the beginning of that phase of altcoin strength accumulation that many are waiting for.