Fear & Greed Index

What does the Fear & Greed Index measure?

The Crypto Fear & Greed Index is a number from 0 to 100 that tries to distill overall sentiment in the crypto market down to a single value. 0 means extreme fear, 100 means extreme greed. It sounds like a simple sentiment gauge, but it isn't — the index is made up of several underlying components: price volatility, momentum and trading volume, social media activity, Bitcoin's dominance of the total market, and search trends. Each component is weighted and combined into the final number.

alternative.me publishes the most widely used version of the index, and it's also the one we follow on this page. The methodology isn't fully disclosed in detail — the weighting of the individual components isn't an open formula you can recompute yourself — but the broad building blocks are known, and that makes the index something more than a Twitter poll about how people feel about the market right now.

Because volatility and momentum weigh heavily in the calculation, the index is in practice closely tied to price movements. Large, fast price drops pull the index down toward fear; sharp rallies pull it up toward greed. It isn't an independent sentiment reading that lives its own life alongside price — it's partly a derivative of price itself.

How do you read it?

The best-known interpretation of the index is contrarian: historically, periods of extreme fear (typically below 20-25) have often turned out to be better times to buy than periods of extreme greed (typically above 75-80). The logic is market-psychological rather than mathematical — when fear is at its peak, weak hands have typically already been shaken out of the market, and much of the panic-driven selling pressure has been spent. Conversely, extreme greed is often a sign that the market is overheated and vulnerable to corrections.

That doesn't mean the index is a timing tool you can trade mechanically. Extreme fear can last for weeks, and the market can keep falling long after the index has hit its low point — the 2022 bear market saw several periods of sustained extreme fear where prices kept dropping regardless. The index tells you something about collective sentiment, not where the bottom is.

Looking at the chart above over time, you'll typically recognize the pattern: the index swings quickly around major news events — regulatory announcements, exchange collapses, macroeconomic shocks — and tends to cluster into longer stretches of either fear or greed rather than swinging randomly from day to day. That makes it most useful as a context indicator you view alongside other signals, not as a standalone one.

When does the indicator lie?

The most important weakness of the Fear & Greed Index is that it's backward-looking. It measures what has already happened to volatility, momentum, and volume — it doesn't attempt to predict what happens tomorrow. Because it's derived so heavily from price movements, the index in practice often just confirms what you can already see by looking at a price chart: it falls when price falls and rises when price rises. That makes it a confirmation indicator rather than a predictive one.

It also means the index can give a false impression of objectivity. A number from 0-100 looks scientific and precise, but the underlying methodology isn't fully transparent, and different providers of similar indices (there are several versions besides alternative.me's) can arrive at different numbers on the same day, because they weight the components differently or use different data sources for social media activity.

Finally, the index is an aggregate measure for the whole market — typically centered on Bitcoin — and therefore doesn't necessarily say anything about sentiment around a specific altcoin or sector. A market can be in "greed" while a particular coin or narrative is in freefall, or vice versa. You should never use the index in isolation as justification for a trade — it's one data point among several, not a trading strategy in itself.

How we use it

At SwapHunt, the Fear & Greed Index is one of several contextual signals we watch when assessing the market's overall state — never as an isolated trigger. We weigh it alongside Bitcoin dominance, the altcoin season index, and our own regime measure (see the other pages under Market), because a single number rarely tells the whole story. We've written more about how this type of sentiment data can be used in practice in our articles, where we regularly review concrete market situations and how the different indicators lined up — or didn't.