Altcoin Season Index
Is it Altcoin Season? See what share of the top 50 coins are beating Bitcoin over 7 days, 30 days, or a year — with a live gauge, the Bitcoin benchmark, and top performers. No signup, runs in your browser.
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How to Read the Altcoin Season Index
- 1Pick a window — 7 days, 30 days, or 1 year — to measure performance over.
- 2Read the gauge: near 0 is Bitcoin Season, near 100 is Altcoin Season.
- 3Check the Bitcoin benchmark — every coin is measured against BTC's move over the same window.
- 4Scan the top performers to see which coins are leading and whether they beat Bitcoin.
What Altcoin Season Really Measures
The index answers one specific question: over the chosen window, what fraction of the top 50 coins outperformed Bitcoin? If Bitcoin rose 10% and 40 of the 50 coins rose more than that, the index reads 80 — decisively Altcoin Season. Crucially, it is a relative measure. Altcoin Season can occur while everything is falling, as long as altcoins fall less than Bitcoin; and Bitcoin Season can occur in a roaring bull market if BTC simply leads the pack. It is about rotation of capital, not the direction of the market.
Historically, capital has tended to flow outward in a wave: into Bitcoin first, then into large-cap altcoins, then down the risk curve into smaller coins — so a rising index late in a cycle is often read as the market's risk appetite expanding. But the same caveats apply as with any sentiment gauge. It says nothing about valuation or what comes next, it can whip between readings on short windows, and 50 coins is a narrow slice of a market with thousands. Use it to understand where relative strength sits today, and pair it with the Fear & Greed Index and Bitcoin dominance for a fuller picture rather than trading off the number alone.
Using the Index Well
It is relative, not directional
A high reading does not mean prices are up — only that altcoins are beating Bitcoin. Both can be true in a down market. Always check the Bitcoin benchmark alongside the gauge.
Switch windows for context
The 7-day view is noisy and reacts to single rallies; the 1-year view shows the bigger rotation. Compare windows before concluding a season has really begun.
Watch the threshold crossings
The signal is in crossing 75 (into Altcoin Season) or 25 (into Bitcoin Season), and how decisively. A reading hovering at 50 is telling you there is no clear leadership.
Pair with Bitcoin dominance
Altcoin Season and falling Bitcoin dominance usually go together. Reading them side by side confirms whether capital is really rotating out of BTC.
Remember the exclusions
Stablecoins and wrapped tokens are removed so the measure reflects genuine altcoins. That is why the coin list here may differ from a raw market-cap top 50.
Not a trade trigger
Rotation gauges describe the crowd, not the future. Use it as context for relative strength, alongside price levels and risk management — never as a standalone entry or exit.
Frequently Asked Questions
What is the Altcoin Season Index?
The Altcoin Season Index measures whether altcoins as a group are outperforming Bitcoin. It looks at the top 50 coins by market cap (excluding stablecoins and wrapped tokens) and counts how many have beaten Bitcoin's price performance over a chosen window. That count, expressed as a 0–100 value, is the index. A high reading means money is flowing into altcoins; a low reading means Bitcoin is leading.
What counts as "Altcoin Season"?
The widely used threshold is 75. When at least 75% of the top 50 coins have outperformed Bitcoin over the window, it is considered Altcoin Season. At the other end, 25 or below is Bitcoin Season, when Bitcoin is beating most of the market. Readings between 25 and 75 are a transition with no clear season.
What time window does this use?
You can switch between 7-day, 30-day, and 1-year windows. The best-known version of this index (from Blockchaincenter) uses a 90-day window, which is not available in a single data request from our source, so we offer 7/30/365-day options instead. The 30-day view is the closest practical proxy for the classic index and is the default.
Why are stablecoins and wrapped tokens excluded?
Stablecoins like USDT and USDC are designed to hold a fixed value, and wrapped or staked tokens (WBTC, stETH) simply track another asset. Including them would be meaningless in a "did it beat Bitcoin" comparison — they are not making independent price moves. Removing them leaves a cleaner set of genuine altcoins, which is standard practice for this index.
How should I use the Altcoin Season Index?
It is a market-rotation gauge, not a buy or sell signal. A rising index suggests capital is rotating from Bitcoin into altcoins, which historically happens later in a bull cycle; a falling index suggests a flight back to Bitcoin, common in risk-off periods. Use it to understand where relative strength sits, alongside price action and your own research — never as a standalone trigger.
Is the data live and is anything stored?
The rankings and performance figures come from the free CoinGecko API, fetched in your browser when the page loads and cached for a few minutes. Nothing you do is stored or sent anywhere. If the data source is briefly rate-limited, the page will ask you to try again shortly.