Altcoin Season Index: A Cheerful Guide to Welcoming Altseason 2025

Altcoin Season Index: Guide to Welcoming Altseason 2025

The Altcoin Season Index is a tool that helps traders track the market rotation from Bitcoin to altcoins more comfortably. Many beginners get caught up in FOMO when prices rise, resulting in losses; this indicator provides an objective benchmark to determine whether altcoins are outperforming.

When the index score exceeds a certain level, most altcoins show better performance than Bitcoin. We will discuss how to read the Altcoin Season Index, and how this indicator can provide a clearer market picture, especially for Altseason 2025.

Also Read: How to Play Crypto for Beginners, Most Updated 2024, General Info

What Is the Altcoin Season Index and Why Is It Important?

How the Altcoin Season Index Works

The Altcoin Season Index (ASI) measures the performance of the 50 largest altcoins (excluding stablecoins) against Bitcoin over the past 90 days. If more than 75% of altcoins outperform Bitcoin, the market is considered to be in an altcoin season phase.

An ASI score above 75 signals a strong altcoin season, while a score below 25 indicates a Bitcoin season.

Why Is ASI Important for Traders?

ASI gives a quick overview of altcoin dominance in the market, making it easier for traders to make decisions. ASI also indicates capital rotation, showing that investors are moving from Bitcoin to altcoins.

For example, ASI reached 80 in September 2025, meaning that altcoins were outperforming Bitcoin in price performance at that time.

Signs That an Altcoin Season Is Happening

1. Altcoin Volume Beats BTC and ETH

• Data shows that altcoin volume in September 2025 accounted for 37.2% of the total crypto market volume, outperforming Ethereum (31.8%) and Bitcoin (30.9%).
   
• This surge in altcoin volume is rare and indicates a rotation of capital into riskier assets.
   

2. Altcoin Season Index Breaks 80

• The Altcoin Season Index (ASI) from Blockchain Center reached above 80, which is the highest level for 2025.
   
• With over 75% of altcoins outperforming Bitcoin, this high ASI indicates that the market is in a strong altcoin season phase.

3. Altcoin Market Capitalization (TOTAL3) Ready for Breakout

• The market capitalization of altcoins (TOTAL3), which includes all altcoins excluding Bitcoin and Ethereum, reached over $1.1 trillion in September 2025.
   
• A bullish triangle pattern formed over the past 4 years is now ready for a breakout. If it breaks, this could trigger a large rally in altcoins.
   

Also Read: 7 Effective Crypto Trading Strategies for Beginners, Complete with Tips and Tricks

Strategy Using the Altcoin Season Index

Tips Using ASI for Trading

• Monitor a stable ASI above 75 for several days. This signals strong momentum for altcoins.
• Check technical patterns. Ensure there is confirmation like a breakout on TOTAL3 or an increase in trade volume.
• Diversify your portfolio into potential and liquid altcoins, avoid relying on a single asset.

Risk Management Strategies

• Use stop-loss to limit losses.
• Manage position size to avoid getting trapped in sharp market fluctuations.
• Trading journal is important for identifying patterns and learning from trading decisions.
  
   

Conclusion

With the surge in trading volume, the altcoin season index reaching its peak, and altcoin market capitalization nearing breakout, the signals for an altcoin season are getting stronger in September 2025.

The crypto market is shifting, with altcoins taking over dominance from Bitcoin and Ethereum. This momentum offers great opportunities for investors to gain profits, but it still requires careful risk management.

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FAQ

What is altcoin season in crypto?

Altcoin season is a period when most altcoins outperform Bitcoin in terms of price and volume. It is typically marked by a rotation of capital from BTC to altcoins.

How long does altcoin season usually last?

The duration of altcoin season varies, but it usually lasts for about 17 days. It may last longer if market momentum is strong.

Why is the Altcoin Season Index (ASI) important?

ASI measures the performance of 50 altcoins against Bitcoin. A score above 75 signals altcoin season and helps traders understand capital rotation in the crypto market.

What does TOTAL3 mean in crypto market analysis?

TOTAL3 is the market capitalization of altcoins, excluding Bitcoin and Ethereum. This indicator is used to assess the strength of the altcoin market independently.

Is altcoin season always high-risk?

Yes, because altcoin volatility is very high. The potential for profits is significant, but the risk of price declines is also substantial. It is advisable to use proper risk management techniques,