Fear & Greed Index

Measures market sentiment from 0 (extreme fear) to 100 (extreme greed).

In short: The Fear & Greed Index compresses market sentiment into a single 0-100 number. It's read contrarian - extreme fear has historically been a better time to buy than extreme greed - but it's backward-looking and moves with price, so it confirms more than it predicts.

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 built from several underlying components:

  • Price volatility - how sharply the market is moving relative to its recent range
  • Momentum and volume - the strength and direction of buying pressure
  • Social media activity - engagement and tone across platforms
  • Bitcoin dominance - shifts toward or away from the safety of BTC
  • Search trends - what the broader public is looking up

alternative.me publishes the most widely used version of the index, and it's the one we follow on this page. The methodology isn't fully disclosed - the exact weighting of each component 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 right now.

Because volatility and momentum weigh heavily, the index is in practice closely tied to price. Large, fast drops pull it toward fear; sharp rallies pull it 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 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 peaks, weak hands have usually already been shaken out, and much of the panic-driven selling pressure has been spent. Extreme greed, conversely, often signals an overheated market vulnerable to correction.

That doesn't make it a timing tool you can trade mechanically. Extreme fear can last for weeks, and the market can keep falling long after the index hits its low - the 2022 bear market saw several stretches 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, you'll recognize the pattern: the index swings quickly around major news - regulatory announcements, exchange collapses, macro shocks - and clusters into longer stretches of fear or greed rather than swinging randomly day to day. That makes it most useful as a context indicator you read alongside other signals.

When does the indicator lie?

The most important weakness is that it's backward-looking. It measures what has already happened to volatility, momentum, and volume - it doesn't try to predict tomorrow. Because it's derived so heavily from price, it often just confirms what a price chart already shows: it falls when price falls and rises when price rises. That makes it a confirmation indicator, not a predictive one.

It also gives a false impression of objectivity. A number from 0-100 looks scientific and precise, but the methodology isn't fully transparent, and different providers of similar indices can land on different numbers on the same day, because they weight the components differently or pull social data from different sources.

Finally, it's an aggregate for the whole market - typically centered on Bitcoin - so it doesn't necessarily say anything about a specific altcoin or sector. The market can be in "greed" while a particular coin is in freefall, or the reverse. Never use the index in isolation to justify a trade: it's one data point among several, not a strategy in itself.

How I use it

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