Crypto Fear and Greed Index: What It Is and How It Works

The Crypto Fear and Greed Index turns the crypto market’s mood into one number. It is published by alternative.me, updated once a day and built from bitcoin market data, social media and search trends. New to crypto? Start with what cryptocurrency is and how it works.

Because the index is built from bitcoin data, it is easiest to read alongside the current bitcoin price. This guide explains who publishes the index, how the score is calculated, what each band means, how it reacted to past events and why it should not be used to time a purchase.

What is the Crypto Fear & Greed Index?

It is a sentiment index: one score from 0 to 100 that estimates whether bitcoin investors are mostly fearful or mostly greedy right now. A score near 0 means Extreme Fear, and a score near 100 means Extreme Greed.

Crypto markets are emotional. When prices rise fast, many people feel FOMO (fear of missing out) and pile in. When prices fall, worry can turn into panic selling. The index tries to measure that mood with data instead of guesswork.

More than one index uses this name. This guide covers the alternative.me index and compares it with CoinMarketCap’s separate index further down.

Who publishes it and how is it calculated?

The website alternative.me publishes the index and calculates a new value once a day. It says the index covers bitcoin only and lists six data sources with fixed weights (as of September 2026):

The page gives weights and short descriptions, not the full formula. It also does not say how the surveys’ share is covered while they are paused. For background on two of the inputs, read what volatility means in crypto and what bitcoin dominance measures.

What do the scores mean?

Each daily score gets one of five labels: Extreme Fear, Fear, Neutral, Greed or Extreme Greed. The index page does not print the exact cut-offs, but the labels in alternative.me’s public data follow these ranges (checked September 2026):

Over its full history, from 1 February 2018 to 28 September 2026, about 52% of daily readings were Fear or Extreme Fear, 13% were Neutral and 35% were Greed or Extreme Greed (alternative.me data). The lowest reading so far is 5 and the highest is 95 (as of September 2026).

How is it different from CoinMarketCap’s index?

CoinMarketCap publishes its own Fear and Greed Index on the same 0 to 100 scale, but it covers a wider market with different data. Its five inputs are the price momentum of the 10 largest cryptocurrencies by market value (excluding stablecoins), implied volatility for bitcoin and ether, the put/call ratio in bitcoin and ether options, the stablecoin supply ratio, and CoinMarketCap’s own data on social trends, searches and user engagement (as of September 2026).

Its index page does not list weights. Because the two indexes use different data, they can show different scores on the same day. Neither is related to CNN’s Fear & Greed Index, which tracks US stocks (see the FAQ below).

Is it a buy or sell signal?

No. The index describes how the market feels today. It does not tell you what prices will do next, so treat it as context, not as a trigger to buy or sell.

• It looks backwards. Half of the published weight (volatility, momentum and volume) comes from bitcoin’s recent price and trading data. A low score often just confirms that prices have already fallen.
• Extremes can last for weeks. The index stayed in Extreme Greed for 76 days in a row from 6 November 2020 to 20 January 2021, and in Extreme Fear for 74 days in a row in 2022.
• It is a short-term snapshot. It reacts to news within days, so it says little about long-term trends. Price also depends on supply, demand and wider events; see how bitcoin’s price is determined.
• Its inputs are limited. It covers bitcoin only, one of its inputs is paused, and its social data comes from a single platform.

Alternative.me frames the index in contrarian terms: extreme fear may mean investors are too worried, and extreme greed may mean the market is overheated. That is a way of reading the mood, not a tested rule. The publisher also states that its content is not investment advice, and nothing on this page is advice either.

How has it reacted to past events?

It tends to drop fast when bad news hits the market and to stay high during long rallies. The examples below use alternative.me’s daily readings (as of September 2026).

Deep fear often comes with falling prices; read what a bear market is and what capitulation means. Past performance does not predict future results.

How can you avoid emotional decisions?

Set your rules before the market tests them. Fear and greed are strongest when prices move fast, and that is when rushed decisions tend to cost the most.

• Decide your budget in advance. Only use money you can afford to lose, and write down why you are buying before you buy.
• Consider a fixed schedule. Dollar-cost averaging (DCA) spreads purchases over time, so you do not have to pick a moment. It does not remove the risk of loss.
• Check the source before you react. FUD (fear, uncertainty and doubt) spreads fast. Look for a primary source and a date before acting on a rumour.
• Notice FOMO. A rising score or a price surge is not a reason to buy on its own.
• Look at more than one number. Use the index as one piece of context next to price, volatility and your own plan.

Malcolm O'Mahony

Malcolm is a Content Marketing Manager at Coinmama. He's passionate about Web3 and specializes in making complex concepts easy to understand. Crypto since 2017. Coinmama since 2020.

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