Ever checked one number before you open your trading app? The Crypto Fear and Greed Index is that number. It is a daily score from 0 to 100, published by Alternative.me, that sums up the mood of the Bitcoin market. A low score means fear, a high score means greed, and the middle means nobody is sure. Read it right, and it keeps you honest about your own nerves. Read it wrong, and it talks you into trades you never planned.
Key points:
- The index is one daily number, 0 to 100, from Alternative.me — and it covers Bitcoin only, not the whole crypto market.
- Six inputs feed the score, but price swings and trading volume carry half the weight between them, so it mostly describes what the market already did.
- Extreme fear once lasted 74 days straight, and extreme greed 76 days, so a low score on its own is never a buy signal.
What the Number Actually Measures
CNN built the first Fear and Greed Index for the stock market. Alternative.me built the crypto version in 2018, keeping the 0-to-100 scale and the plain labels, and swapping the stock inputs for ones that exist in crypto. Its public history starts on 1 February 2018, with a first reading of 30. The lowest reading on record is 5, hit in 2019 and twice again in February 2026. The highest is 95.
One fact trips up almost everyone who finds the index: It covers Bitcoin only. The biggest inputs are Bitcoin's own price swings and Bitcoin's trading volume, so the score tells you how Bitcoin traders feel. Altcoins can be doing something else entirely on the same day. My own read is simple: The index is a mirror, not a crystal ball. It shows you the crowd's nerves, and nerves alone never timed a market well.
The score updates once a day, not by the minute. A crash at noon shows up only in the next day's number.
Read the Score in Five Bands
Every daily reading lands in one of five bands. The table is all most people need — a score of 31 and a score of 34 carry the same message, so read the band, not the exact number.
The five bands at a glance:
| Score | Label | What it means |
| 0–25 | Extreme Fear | Strong worry: sharp falls, heavy selling, high volatility |
| 26–46 | Fear | More worry than usual |
| 47–54 | Neutral | No strong lean either way |
| 55–75 | Greed | More optimism than usual |
| 76–100 | Extreme Greed | Strong optimism: fast rises, heavy buying, a surge of attention |
Neutral is the narrowest band, only eight points wide, and only about one reading in eight has landed there since 2018. Most days, the market leans one way or the other.
Six Inputs, One Number
Alternative.me lists six inputs, each with a fixed weight. Half the score comes from price and volume alone, so the index leans hard on what the market already did.
What goes into the score:
| Input | Weight | What it reads |
| Volatility | 25% | Bitcoin's price swings and drops, against 30- and 90-day averages. A jump reads as fear. |
| Market momentum and volume | 25% | Trading volume and momentum, against the same averages. Heavy buying in a rising market reads as greed. |
| Social media | 15% | Bitcoin posts on X and how fast they pick up replies and likes. A surge reads as greed. |
| Surveys | 15% | Weekly polls of 2,000 to 3,000 votes each. Marked as paused on the methodology page. |
| Bitcoin dominance | 10% | Bitcoin's share of all crypto value. A rising share reads as fear, since money is leaving riskier altcoins. |
| Google Trends | 10% | Search interest in Bitcoin queries. A jump in searches like "bitcoin price manipulation" reads as fear. |
One honest caveat: With the surveys paused, the live score rests on the other five inputs, and the methodology page does not say how the missing 15% is shared out. Treat the weights as the published design, not an audited recipe.
Read also: What Is Bitcoin Dominance? Why Nearly 60% of Crypto Money Sits in Bitcoin
The Mistake Most Beginners Make
The most common wrong idea about the index is also the most costly: Extreme fear means buy, extreme greed means sell. The history says otherwise. In 2022, the index sat in extreme fear for 74 days in a row, and anyone who bought on day one watched the market fall further for weeks. Across 2020 and 2021, it sat in extreme greed for 76 days, and prices kept climbing long after the first greedy reading.
The score describes the recent past. Volatility and momentum, half its weight, compare Bitcoin's latest moves with 30- and 90-day averages, and the social and search inputs count what people already posted and typed. None of it looks forward.
Use It to Check Yourself, Not to Time the Market
1. Check it once a day, at the same time. It updates daily, so checking it every hour adds nothing but nerves.
2. Write the number down before you trade, next to the price you would buy at and the price that would prove you wrong. If the index moves but your plan does not, the index did its job.
3. Ask what the crowd is doing, then ask what you planned to do. When the two disagree, trust the plan you wrote while you were calm.
4. Compare providers before you trust one number. On 10 October 2025, Alternative.me read 64, greed, while CoinMarketCap read 54, neutral. Different recipes give different answers, so never treat one provider's score as the market's verdict.
Quick Answers
Does a low score mean Bitcoin is cheap? No. It means traders are scared, and scared markets can fall further.
Does the index cover altcoins? No. It covers Bitcoin only. The headline index is Bitcoin's mood, even when altcoins move the other way.
Before your next trade, write down three numbers: Today's index reading, the price you would buy at, and the price that would prove you wrong. Then check the index again tomorrow. If the number moved but your plan stayed put, the index did exactly what it is for — it showed you the crowd, and you kept your own head.
Read also: Bull Market vs Bear Market in Crypto: 5 Signs That Tell Them Apart
— BitByLine News Desk
This post is for learning only. BitByLine only explains and teaches — this is NOT financial advice, and we never tell anyone to buy or sell crypto. Whether you buy or not is always your own decision and your own risk. Always do your own research first. Read our full Disclaimer.
Sources: Banxa, Coinmama, Zipmex, Blockspot, Alternative.me
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