What you need to know about crypto fear and greed index If you want to be successful when investing in cryptocurrencies, it is important to put extra effort into understanding the market sentiment and movement. Learning the mood of the market will give you great insight into the ideal time of making an investment. Many investors lean toward the use of technical tools to gain a better grasp of the current market scenario. Since fear and greed are huge factors that affect the mood of the market, the crypto fear and greed index has become a valuable tool for investing.