According to @CoinMarketCap, the Crypto Fear & Greed Index uses a five-level scale: under 20 equals extreme fear, 20–40 fear, 40–60 neutral, 60–80 greed, and over 80 extreme greed (source: CoinMarketCap). According to CoinMarketCap, historically, extreme readings have signaled potential reversals in crypto market sentiment (source: CoinMarketCap). According to CoinMarketCap, extremes below 20 or above 80 can serve as contrarian signals for timing potential turning points (source: CoinMarketCap).