Measures Bitcoin market sentiment from 0 (extreme fear) to 100 (extreme greed). Components: Volatility (25%), market momentum/volume (25%), social media (15%), surveys (15%), BTC dominance (10%), Google Trends (10%). • Below 10: Extreme fear — historically strong bounce zones • 20–40: Fear — consider dollar-cost averaging • 60–80: Greed — consider reducing positions • Above 90: Extreme greed — overheated, high correction risk Unlike CNN Fear & Greed (stocks), this updates 24/7, reflecting crypto's rapid sentiment shifts.