The COIN50 index, also known as the Coinbase 50 Index, is a crypto market benchmark that tracks the performance of the 50 largest and most liquid digital assets by market capitalization. It aims to be a broad crypto market standard, similar to how the S&P 500 represents the stock market. The index uses a market capitalization-weighted approach and applies fundamental and market eligibility criteria to ensure investability, excluding stablecoins and privacy coins.