The highest crypto market cap ever recorded is currently Bitcoin’s, reaching over $1 trillion at a full $1.18 trillion around the Coinbase Global stock market launch. The total crypto market cap’s highest ever was well over $2 trillion and is still climbing. To calculate a coin’s market cap, you multiply the number of coins that have been issued by the price of a single coin. For example, on July 21, 2021, the supply of Ether was 116.8 million coins. Multiply that by the coin price of 1,588.61 euros, and you arrive at the Ethereum market cap of 185.5 billion euros. Market cap is a primary measure of the total value. When altcoins have a high market cap, people might see them as more reliable and trustworthy. At the same time, when they have a low market cap they are seen as speculative, new, and less reliable cryptocurrencies.