Market breadth, measured against Bitcoin
Altcoin Season Index
The percentage of leading altcoins outperforming Bitcoin. A score above 75 signals broad altcoin leadership.
90-day score
56
/ 100
Transition Zone
Leadership is mixed and market breadth has not reached either extreme.
Snapshot recorded
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Index History
Historical snapshots accumulate daily from this deployment.
View recent values as a table
| Date | Index value |
|---|
30-day relative strength
Leading Bitcoin Outperformers
ArbitrumARB · Rank #58
+115.79% vs BTC
UniswapUNI · Rank #22
+108.45% vs BTC
NEAR ProtocolNEAR · Rank #23
+95.15% vs BTC
BitwayBTW · Rank #41
+85.62% vs BTC
Venice TokenVVV · Rank #62
+73.71% vs BTC
ZcashZEC · Rank #9
+70.41% vs BTC
AvalancheAVAX · Rank #25
+31.89% vs BTC
GateGT · Rank #72
+28.93% vs BTC
What the index says today
On September 23, 2026 the Altcoin Season Index reads 56/100 on its 90-day window: 56% of the 50 tracked altcoins have outperformed Bitcoin over that period. That places the market in the transition zone. Leadership is mixed and market breadth has not reached either extreme.
Compared with earlier readings, the index is up 27 points from a week ago (29), up 14 points from a month ago (42).
Since July 14, 2026 it has ranged from 24 (August 31, 2026) to 74 (August 1, 2026). It has not reached the altcoin season threshold of 75 since July 14, 2026.
The shorter and longer windows tell you whether a move is new or established: the 7-day index is 76, the 30-day 70, the 90-day 56 and the one-year 32. Short-term and monthly breadth broadly agree.
The index counts the 50 largest altcoins by market capitalisation, excluding stablecoins, tokenised funds and wrapped or staked versions of other assets, and asks what share beat Bitcoin. 75 or more is altcoin season, 25 or less is Bitcoin season, and the range between is a transition. Bitcoin dominance is 58.7% on the same date.
How these figures are calculatedAltcoin Season Index questions
- What is the Altcoin Season Index today?
- The Altcoin Season Index is 56/100 on September 23, 2026, using the 90-day window: 56% of the 50 tracked altcoins outperformed Bitcoin. That is the transition zone.
- Is it altcoin season right now?
- No. The index is 56, below the altcoin season threshold of 75, and Bitcoin dominance is 58.7%. A confirmed altcoin season needs the index at 75 or more with dominance under 42%.
- When was the last altcoin season?
- The index has not reached 75 since this tracker's history begins on July 14, 2026.
- When was the last Bitcoin season?
- The index last fell to 25 or below, the Bitcoin season zone, on September 2, 2026.
- How is the Altcoin Season Index calculated?
- It takes the 50 largest altcoins by market cap, excluding stablecoins, tokenised funds and wrapped or staked assets, and measures the share whose return beat Bitcoin's over the window. A score of 60 means 60% of them outperformed Bitcoin.
- What is the difference between the 30-day and 90-day index?
- The 30-day index reacts quickly and can flip on a single strong month; the 90-day index needs a sustained rotation and is the headline signal here. Today they read 70 and 56.
No mystery score
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