

The Altcoin Season Index is a real-time indicator that measures whether the cryptocurrency market is currently dominated by altcoins compared to Bitcoin. This metric is calculated based on the three-month performance comparison between the top 100 cryptocurrencies by market capitalization and Bitcoin.
When a significant number of altcoins outperform Bitcoin over a 90-day period, it signals a potential shift in market dynamics toward alternative cryptocurrencies.
The index serves as a valuable tool for cryptocurrency traders and investors to identify market trends and adjust their portfolio strategies accordingly. By tracking the relative performance of altcoins against Bitcoin, market participants can better understand the current market sentiment and capital flow patterns within the cryptocurrency ecosystem.
According to data from CoinMarketCap reported by Chainthink in recent months, the Altcoin Season Index has climbed to 28. This increase indicates that 28 out of the top 100 cryptocurrencies by market capitalization have demonstrated superior performance compared to Bitcoin over the past 90 days. This metric represents a notable shift in market dynamics, suggesting growing investor interest in alternative cryptocurrencies beyond Bitcoin.
The rise in the index reflects a broader trend where capital is flowing into various altcoin projects, potentially driven by factors such as technological innovations, ecosystem developments, or specific market catalysts affecting individual projects. This diversification of investment across multiple cryptocurrencies indicates a maturing market where investors are increasingly evaluating projects based on their individual merits rather than following Bitcoin's lead exclusively.
The CMC Altcoin Season Index employs a straightforward yet effective methodology to assess market conditions. It continuously monitors the performance of the top 100 cryptocurrencies over a rolling 90-day period, comparing each altcoin's price performance against Bitcoin. When an altcoin's percentage gain exceeds Bitcoin's gain during this timeframe, it counts toward the index score.
This three-month measurement window is particularly significant as it filters out short-term volatility and noise, providing a more meaningful assessment of sustained market trends. The 90-day period is long enough to reflect genuine shifts in market sentiment while remaining responsive to evolving market conditions. By focusing on the top 100 cryptocurrencies, the index captures a representative sample of the market while excluding smaller, more volatile projects that might skew the results.
The current reading of 28 on the Altcoin Season Index carries important implications for market participants. While this indicates that more than a quarter of major altcoins are outperforming Bitcoin, it also means that Bitcoin still maintains relative strength compared to the majority of alternative cryptocurrencies. This suggests a mixed market environment where selective altcoins are experiencing strong performance, but Bitcoin remains the dominant force.
For investors, this metric can inform portfolio allocation decisions. A rising Altcoin Season Index may suggest opportunities in carefully selected alternative cryptocurrencies, particularly those with strong fundamentals, active development teams, and growing adoption. However, it's crucial to conduct thorough research on individual projects rather than simply chasing performance metrics.
The index also serves as a risk management tool. When the index reaches higher levels, it may indicate increased speculation in the altcoin market, potentially signaling the need for caution. Conversely, lower readings might suggest that Bitcoin is dominating capital flows, which could present opportunities in undervalued altcoin projects. Understanding these dynamics helps investors navigate the complex cryptocurrency market with greater awareness of prevailing trends and potential risks.
Altcoin Season Index measures altcoin performance against Bitcoin. It analyzes whether altcoins outperform Bitcoin during specific periods, indicating market cycles favoring alternative cryptocurrencies over Bitcoin dominance.
An Altcoin Season Index of 28 indicates moderate altcoin momentum with increasing investor interest. This value suggests capital is flowing into altcoins, signaling a shift toward altcoin dominance in the market cycle.
During Altcoin Season, diversify investments across promising projects with strong fundamentals and teams. Focus on projects with solid technology, analyze trading volume and market trends, and allocate capital strategically. Monitor emerging narratives and undervalued altcoins for potential high returns.
Bitcoin Season occurs when Bitcoin outperforms altcoins, while Altcoin Season is when altcoins outperform Bitcoin. They switch based on market dynamics, capital flow, and investor sentiment shifts in the crypto market.
When Altcoin Season Index is elevated, risks include rapid market volatility, potential fund outflows if Bitcoin declines, and reduced overall market liquidity. Investors should exercise caution as altcoin valuations may experience significant fluctuations during these periods.
Historically, after Altcoin Season Index peaks, altcoins experience a correction phase as traders take profits. The market typically sees increased volatility, with transaction volume shifting back toward Bitcoin dominance. This marks the transition from altcoin outperformance to a consolidation period before the next cycle begins.
Investors can monitor the Altcoin Season Index to gauge market trends. When over 75% of top 100 altcoins outperform Bitcoin within 90 days, it signals Altcoin Season—favoring altcoin investments. Below 25% indicates Bitcoin Season. Use this metric to align portfolio allocation with prevailing market cycles and capitalize on seasonal opportunities.











