Cryptocurrency investors have staged one of the fastest mood reversals in recent market history, pushing a widely followed sentiment gauge from deep fear to greed in under two weeks as Bitcoin surged toward the $80,000 mark.

The Crypto Fear and Greed Index climbed to 74 on Tuesday, its highest reading since Oct. 5, 2025, just five days before a market crash erased roughly $19 billion in leveraged positions in a single session. The index, which had languished at 27 on Aug. 12, eased to 65 on Wednesday, still firmly in greed territory. It had spent every day from late July through Aug. 19 in the fear zone, bottoming at 25 on Aug. 6 — a level the index classifies as extreme fear.

The gauge blends bitcoin’s volatility and trading…