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.
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.