A Fear and Greed Index combines selected data into a sentiment score, commonly from 0 to 100. Lower readings indicate greater fear under the provider’s model, while higher readings indicate greater greed. The number is an interpretation of market conditions, not a direct count of how every investor feels.
The provider changes the meaning
There is no single universal crypto index. Alternative.me’s published methodology focuses on Bitcoin and uses inputs such as volatility, momentum and volume, social activity, dominance, and search trends. CoinMarketCap uses a different model that also includes broader coin-price momentum and derivatives information.
As a result, two providers can produce different readings on the same day. Comparisons should identify the source, date, market coverage, and methodology rather than treating all similarly named scores as interchangeable.
Reading extremes carefully
A score of 80 does not mean an 80% chance of a price increase or decrease. Strong fear or greed can persist while prices continue trending. Some traders study extremes as possible contrarian clues, but an extreme reading does not confirm a reversal, fair valuation, or a suitable entry point. The index is a compact sentiment indicator with model and data limitations.