Plain English
The Crypto Fear & Greed Index scores market sentiment 0 (extreme fear) to 100 (extreme greed). It blends volatility, volume, social media, surveys, and Bitcoin dominance into a single number. It is widely watched as a contrarian indicator — extreme greed often precedes corrections, extreme fear often precedes rallies.
How it actually works
Alternative.me publishes the most-referenced version. Readings above 80 (extreme greed) and below 20 (extreme fear) historically mark sentiment extremes. The index is a lagging measure of crowd psychology, not a predictive model — but persistent extremes do correlate with reversals over weeks-to-months.
What it means for you
Use it as a sanity check, not a signal. When the index is in extreme greed and your gut says “I should buy more,” that is the moment to lock in profits or rebalance. When it is in extreme fear and you want to sell everything, that is usually the moment to be adding. The point is not to time tops and bottoms — it is to avoid emotional decisions at exactly the wrong moment.
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Educational content only. Not investment, tax, or legal advice.