Copyright © 2023 MarketWatch, Inc. All rights reserved. Yes! It is completely legal to use cryptocurrency such as Bitcoin. Individuals are allowed to use which currency they want as long as both parties agree on the same means of payment. However, there are countries that have indirectly or partially prohibited cryptocurrency. The reason for this varies, but generally, the government wants more control over the financial market. Here is a list of all countries’ laws about Bitcoin. To know the market cap of popular crypto currencies you can use websites like CoinMarketCap where they provide enough data about a coin or a token. However all the new coins, tokens and ICOs are not listed on these data websites. take a look at this site This tool is for users who are looking to estimate market cap of such crypto assets.