The Altcoin Season Index is a data-based indicator that illustrates how top altcoins have historically performed relative to Bitcoin over specific periods.
By converting relative performance data into a single score, the index provides a simplified view of past market dynamics and capital distribution trends within the crypto ecosystem.
An "Altcoin Season" refers to historical periods when a majority of altcoins showed stronger relative performance than Bitcoin, typically measured over a 90-day window.
The index summarizes this comparison as a score between 0 and 100 for informational reference.
The Altcoin Season Index Chart reflects the 90-day historical performance of the top 100 altcoins (excluding stablecoins and pegged tokens) compared to Bitcoin. The methodology identifies whether 75% or more of the selected altcoins outperformed BTC during the observed period — a condition historically referred to as “Altcoin Season.”
Calculation steps:
1. Select the top 100 non-stablecoin cryptocurrencies by market capitalization.
2. Measure each altcoin’s 90-day performance.
3. Compare each performance to Bitcoin’s 90-day return.
4. Count how many altcoins outperformed Bitcoin.
5. Convert this ratio into a percentage and scale it between 0 and 100.The Altcoin Season Index ranges from 0 to 100 and provides a simplified overview of how altcoins and Bitcoin have performed relative to each other over time:
- 0–25: Historically, Bitcoin outperformed most altcoins.
- 26–49: Transitional range without a consistent performance trend.
- 50–74: Periods when many altcoins showed stronger relative performance.
- 75–100: Broad altcoin outperformance observed historically.
This framework helps users understand historical market leadership between Bitcoin and altcoins but should not be interpreted as a predictive or trading signal.
The altcoin market includes all cryptocurrencies other than Bitcoin, such as major smart contract platforms (e.g., Ethereum), DeFi tokens, NFTs, meme coins, and emerging blockchain projects.
Altcoin dominance
This refers to the percentage of total crypto market capitalization represented by altcoins. An increase in altcoin dominance indicates a relative expansion of the altcoin market’s share compared to Bitcoin.
The altcoin season index chart signals Altseason when 75% or more of the top 100 altcoins outperform BTC over a 90-day window.
Altseason often coincides with:
- Bitcoin price consolidations after strong rallies
- New technological narratives like NFTs or Layer 2 adoption
- Bullish market sentiment and increased speculation
Understanding when this shift occurs can help traders align their strategies with current market trends.
The Altcoin Season Index can be used in several strategic ways:
-Track market sentiment: Detect when traders are rotating from BTC into altcoins
-Timing entries: Enter altcoin positions early as the index climbs past 50
-Manage risk: Reduce exposure when the index nears 100, as this may signal overheating
-Portfolio rebalancing: Adjust allocation based on where capital is flowing
This tool is not predictive, but it provides useful context for decision-making.
The Altcoin Season Index methodology is based on objective, transparent criteria:
- Coin selection: Top 100 non-stablecoin cryptocurrencies by market capitalization.
- Performance window: 90-day rolling performance comparison.
- Benchmark: Each altcoin is compared directly to Bitcoin’s 90-day return.
- Update frequency: Index is recalculated daily.
The resulting score reflects how many altcoins have historically outperformed Bitcoin during the chosen time frame.
While the Altcoin Season Index offers a useful overview of historical performance patterns, it has several limitations:
- Lagging indicator: It reflects past 90-day results, not future projections.
- Limited scope: Focused on top 100 coins, excluding smaller-cap assets.
- No volatility weighting: Based solely on price performance.
- Stablecoins excluded: Some market participants are filtered out by design.
Users should view this indicator as one of multiple data points for understanding past market behavior rather than a standalone decision-making tool.
The Altcoin Season Index provides an accessible way to visualize shifts in relative performance between Bitcoin and major altcoins.
It serves as a data-driven reference for understanding historical market cycles and capital allocation trends but should not be used to predict or guide investment decisions.
An altcoin refers to any cryptocurrency that is not Bitcoin.
This category includes Ethereum, BNB, Solana, Cardano, and other Layer 1/Layer 2 tokens, as well as DeFi, NFT, meme, and governance tokens.
Stablecoins and pegged assets such as WBTC are excluded from the index calculation.
Although Ethereum is a leading blockchain network with the second-largest market capitalization, it is still classified as an altcoin because it is not Bitcoin.
For this reason, Ethereum is included in the relative performance comparison within the index.
The index is recalculated daily using market data from the top 100 cryptocurrencies by market capitalization.
Each day's score represents the most recent 90-day relative performance comparison between these altcoins and Bitcoin.
The index uses historical price performance data from the top 100 cryptocurrencies by market capitalization (excluding stablecoins and pegged tokens).
Each altcoin's 90-day return is compared against Bitcoin’s 90-day return to produce the index score.
No.
The index is a lagging indicator that reflects historical performance over the past 90 days.
It does not predict future market movements or provide trading signals.
Its purpose is to help users understand historical relationships between Bitcoin and altcoins based on past performance data.
The Altcoin Season Index is intended for informational and educational purposes only.
It should not be used to make investment or trading decisions.
While the index reflects past relative performance patterns between Bitcoin and altcoins, it is not predictive and should not be interpreted as financial advice or a market timing tool.
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