Market capitalization is the total value of all outstanding shares, tokens, or units available for a given traded item. In crypto, the market cap is defined as the circulating supply of tokens multiplied by current price.
If a coin has 100 tokens outstanding and is trading for $10 a coin, it has a market cap of $1000. There are around 17.1 million bitcoins in existence, and the price is around $6300 at time of writing. Bitcoin’s market cap, therefore, is roughly $108 billion.
To check the market cap of Metal you can visit either one of these websites: