The Crypto Fear and Greed Index is a sentiment gauge that compresses market emotion into a single number between 0 and 100, where 0 is extreme fear and 100 is extreme greed. Created by Alternative.me in 2018, it adapts a similar index CNN had built for stock markets.
One statistic frames its usefulness better than any description. Research has found the index agrees with same-day market sentiment roughly 79% of the time, and predicts next-day price direction about 49% of the time, which is indistinguishable from a coin flip. It describes the present well and forecasts nothing.
How it is calculated
Alternative.me's version, the most widely cited, blends five inputs with fixed weights.
| Component | Weight | What it measures |
|---|---|---|
| Volatility | 25% | Bitcoin's current volatility and maximum drawdown against 30 and 90-day averages |
| Market momentum and volume | 25% | Current volume and momentum against the same 30 and 90-day baselines |
| Social media | 15% | Interaction rates on Bitcoin-related hashtags on X |
| Bitcoin dominance | 10% | Bitcoin's share of total crypto market cap |
| Google Trends | 10% | Search volume for Bitcoin-related queries |
| Surveys | 15% | Polls of market participants, paused by the provider |
Each input is normalised to a 0 to 100 scale, then blended. Volatility and momentum carry half the total weight between them. Both reflect what people did rather than what they said.
Worth noticing too is the direction of the dominance component. Rising Bitcoin dominance pushes the score toward fear, on the reasoning that capital concentrating in Bitcoin is a defensive move away from altcoins.
How to read the score
| Score | Label | What it describes |
|---|---|---|
| 0 to 24 | Extreme fear | Sentiment heavily one-sided toward pessimism |
| 25 to 44 | Fear | Caution dominant, buying interest weak |
| 45 to 55 | Neutral | No clear directional bias |
| 56 to 75 | Greed | Optimism dominant, momentum positive |
| 76 to 100 | Extreme greed | Sentiment heavily one-sided toward optimism |
Among traders, the extremes are treated as the informative part. The middle of the range describes a market with no strong view, which is a fact about sentiment rather than a signal.
The contrarian reading
Attached to this index more than any other interpretation is Warren Buffett's line about being fearful when others are greedy.
Applied here, the argument runs that extreme fear tends to appear near market lows, when selling has already happened. Extreme greed appears near highs, when the marginal buyer has already bought. Both are readings about positioning. A one-sided market has fewer people left to push it further.
Sound as that logic is, its predictive record is weak, which is precisely what the 49% next-day figure captures. Extreme readings can persist for weeks, and a market in extreme fear can stay there while continuing to fall.
The two versions disagree
CoinMarketCap runs a separate index on entirely different inputs. Those are price momentum across the top 10 assets excluding stablecoins, Volmex implied volatility indices for Bitcoin and Ethereum, the put-call ratio in options markets, and the stablecoin supply ratio.
Both are called the Crypto Fear and Greed Index. They can print different numbers on the same day. They measure different things. Anyone citing a reading should say which one.
What it does not tell you
- It is Bitcoin-centric. Alternative.me's model runs almost entirely on Bitcoin inputs. A reading of 20 during a Bitcoin selloff may say nothing about what mid-cap DeFi tokens are doing.
- Lag is built in. The 30 and 90-day baselines mean a single dramatic day does not move the score much if the prior month was calm.
- It measures sentiment, not value. Nothing in the calculation assesses whether anything is cheap or expensive.
- The survey component is paused, so the published weights do not fully describe the live calculation.
- It cannot predict. Same-day agreement around 79%, next-day prediction around 49%.
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Frequently asked questions
Who created the Crypto Fear and Greed Index?
Alternative.me launched it in 2018, adapting the concept from CNN's stock market version. CoinMarketCap later built a separate index using different inputs under the same name.
What does a Fear and Greed score of 20 mean?
Extreme fear. Sentiment is heavily one-sided toward pessimism, driven mainly by high volatility and weak momentum relative to the previous 30 and 90 days.
Is the Fear and Greed Index accurate?
It describes current sentiment well, agreeing with same-day market mood roughly 79% of the time. As a predictor of next-day direction it performs at about 49%, which is no better than chance.
Should I buy when the index shows extreme fear?
The index measures sentiment rather than value, and extreme readings can persist for weeks while prices continue moving in the same direction. It offers context on positioning rather than an entry signal, and it cannot tell you anything about your own circumstances.
What are the components of the index?
For Alternative.me: volatility at 25%, market momentum and volume at 25%, social media at 15%, surveys at 15% though currently paused, Bitcoin dominance at 10%, and Google Trends at 10%.
Why do different sites show different Fear and Greed scores?
Because Alternative.me and CoinMarketCap run separate indices with different inputs. One uses Bitcoin volatility and social data, the other uses options market data and implied volatility indices.
Does the index cover altcoins?
Alternative.me's version is built almost entirely from Bitcoin inputs, so it reflects Bitcoin sentiment specifically. CoinMarketCap's version draws on the top 10 assets excluding stablecoins, giving slightly broader coverage.
