What is the Fear and Greed Index?
- Author
- CRYPTO PORT Editorial
- Published
- Updated
- Reading time
- 4 min
In short
The Fear and Greed Index blends several inputs — volatility, volume and others — into a single 0–100 number. It is a rough read on sentiment, not a forecast of prices. Each provider defines its own formula; there is no official standard behind it.
Key points
- A 0–100 composite of several inputs
- Each provider sets its own formula
- A summary of mood, not a prediction
- Extreme readings do not imply a reversal
Definition
An index that combines volatility, volume, social media activity and similar inputs into a score from 0 (extreme fear) to 100 (extreme greed), with the formula varying by provider.
A typical version weights recent volatility, volume momentum, social media chatter, Bitcoin dominance and search trends. Both the inputs and the weights are the provider's own choices; no industry definition exists, which is why sites disagree on the same day.
A low reading summarises a stretch of falling prices and rising volatility; a high one summarises rising prices and rising attention. In other words the index condenses what has already happened — it contains nothing about what happens next.
You will see it framed as 'extreme fear means a buying opportunity'. That reading has no support in the index's design or in any verified result. Extreme values can persist for months, and prices can keep going in the same direction. It is safest to treat the index as nothing more than a summary of mood.
Watch out for
- · No established evidence supports using this index to decide trades
- · If a provider changes its formula, the series is no longer continuous
- · Social media inputs can be skewed by bots and paid promotion