May 2026 · 4 min read
The Fear & Greed Index for Crypto: What It Is and How to Use It
The Fear & Greed Index is one of the most watched sentiment indicators in crypto. Learn what drives it, how to read it, and how WalletLens calculates a personalised version for your own portfolio.
"Be fearful when others are greedy, and greedy when others are fearful." Warren Buffett's famous maxim applies to crypto markets just as much as it does to stocks — arguably more so, given the emotional volatility of the space.
The Fear & Greed Index attempts to quantify where the market sits on that emotional spectrum at any given moment, giving investors an objective number to anchor their decisions.
What Is the Fear & Greed Index?
The most widely followed crypto Fear & Greed Index (published by Alternative.me) produces a daily score from 0 to 100:
- 0–24: Extreme Fear — Investors are panicking. Historically a potential buy signal.
- 25–49: Fear — Market sentiment is negative but not extreme.
- 50: Neutral — Neither fearful nor greedy.
- 51–74: Greed — Investors are bullish and risk-on.
- 75–100: Extreme Greed — Euphoria. Historically associated with market tops.
The score is calculated from six data sources: market volatility, market momentum/volume, social media sentiment, surveys, Bitcoin dominance, and Google Trends data for Bitcoin-related searches.
How to Interpret the Score
The Fear & Greed Index is most useful as a contrarian indicator. Historically:
- Readings below 20 (extreme fear) have often coincided with major Bitcoin bottoms — March 2020 (COVID crash), November 2022 (FTX collapse).
- Readings above 80 (extreme greed) have often preceded short-term corrections — late 2017, early 2021.
This doesn't mean you should blindly buy at 15 or sell at 85. But it provides a useful gut-check: if you're feeling the urge to buy because "everything is going up and you're missing out," check the index. If it's at 85, you're probably not the first to notice.
The WalletLens AI Fear & Greed Gauge
WalletLens calculates a personalised Fear & Greed score for your own portfolio — not the broad market. This is more actionable than the market-wide index because it reflects your actual exposure.
The on-device calculation combines four signals:
1. Price momentum — Are the assets in your portfolio trending up or down over the past 24 hours and 7 days? Strong positive momentum adds to Greed; negative momentum pushes toward Fear.
2. P&L ratio — What percentage of your holdings are in profit vs. loss? A portfolio where 80% of assets are in the green scores toward Greed; one where most positions are underwater scores toward Fear.
3. Trade sentiment — Looking at your transaction history, are you in a buying phase or a selling phase recently? Net buying pushes toward Greed; net selling toward Fear.
4. Concentration risk — A highly concentrated portfolio (e.g. 90% in a single asset) adds a small Greed component if that asset is up, or a Fear component if it's down — because your emotional exposure is amplified.
The resulting number appears on the AI tab as a live arc gauge with a needle, colour-coded from deep red (Extreme Fear) through yellow (Neutral) to deep green (Extreme Greed).
Practical Uses
- Rebalancing trigger: If your personal gauge hits Extreme Greed (above 75), consider whether you should take some profit and rebalance toward your target allocation.
- Buying opportunity check: If it drops below 25, review which positions have the best entry quality (see the Entry Quality card) — the fear may be creating a buying opportunity.
- Emotional circuit breaker: When you feel the urge to make a panic sell or a FOMO buy, look at the gauge first. It forces a moment of data-driven reflection.
See your personalised Fear & Greed gauge and portfolio analytics at walletlens.live — free, no sign-up required.