Crypto fear & greed index How to Use Fear and Greed Index or What to Use It For If you're about to make an investment decision, but are unsure just how much that decision is affected by the general atmosphere of Fear or Greed on the market, checking the index can be quite helpful. The Fear Index era is all about selling, so valuable assets are sometimes "thrown out with the bathwater." In contrast, the Greed Index era is characterized by careless investments in assets the value of which is overblown. The Fear and Greed Index is just another tool to support your decision-making process