CoinGecko maintains an exchange listing at https://www.coingecko.com/en/exchanges.

To be listed on CoinGecko, do fill up our Request Form. Listings will have to fulfill an internal set of criteria before it is listed on CoinGecko. These criteria will not be disclosed. 

An exchange (Spot/Derivatives) must have publicly accessible API documentation for exchange listing. Do not submit this request form if you do not have API documentation. Ideal Exchange API endpoints are documented here.

There is NO LISTING FEE for exchange listings on CoinGecko. Anyone claiming that they can list a coin or expedite the listing process on CoinGecko is a scammer

We are experiencing extremely high volumes of exchange listing applications and with the large backlog that we currently have, we are unable to provide you with an estimated time when we can process your application.