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Altcoin Season Index

Methodology: top 100 coins by CMC market cap (stablecoins and wrapped tokens excluded), updated daily
Is It Altcoin Season Right Now?
Updated 09/21 08:01 UTC+8
48 / 100
Transition
vs yesterday −1

On 09/21 the Altcoin Season Index is 48: over the past 90 days, 48% of the top-100 coins outperformed Bitcoin. The market is in the transition zone — not a clear altcoin season yet. BTC dominance is 58.58%, −0.16 pp vs yesterday.

Yesterday
49
Last Week
40
Last Month
38
BTC Dominance
58.58%
Index History
Past year, daily
BTC Dominance (BTC.D)
Past 90 days
Sector Performance
24h change across 51 sectors
Strongest Sector
Tool+24.71%
Yield+18.42%
Robinhood Eco+13.02%
Weakest Sector
Commodity−2.06%
CN Stock−1.13%
Bond−0.05%
See relative strength across all 51 sectors →
FAQ
What is altcoin season?
A period when money rotates from Bitcoin into altcoins and most alts outperform BTC. Historically it tends to follow a Bitcoin-led rally, after BTC dominance peaks and rolls over.
How is the Altcoin Season Index calculated?
Take the top 100 coins by market cap (excluding stablecoins and wrapped tokens) and measure the share whose 90-day return beats Bitcoin. Above 75 is altcoin season, below 25 is Bitcoin season, in between is the transition zone. Values before 2026-08-11 are backfilled estimates computed from the current constituent set.
How does BTC dominance relate to altcoin season?
BTC dominance (BTC.D) is Bitcoin's share of total crypto market cap. Falling dominance usually means money is moving into altcoins, in the same direction as a rising index — read together, they cross-check whether rotation is real.
Should I buy altcoins once the index says altcoin season?
The index describes market state, not a trading signal. Even in altcoin season, sectors diverge widely — check sector performance to see which ones are actually moving before acting.

What happens after the index turns? Let Blave Agent turn "index crosses 75 and BTC dominance rolls over" into a backtestable rule and alert you when it fires.

Learn About Blave Agent →