What are the rules for CoinMarketCap listing?

Could you kindly explain the rules for CoinMarketCap listing? I'm curious about the criteria that need to be met for a cryptocurrency to be included on the platform. Are there specific standards or guidelines that need to be followed? Additionally, I'm interested in knowing whether there's a fee involved in the listing process and if there are any ongoing requirements that need to be met once a coin is listed. Thank you for clarifying these points for me.