If an exchange is missing from the CoinGecko listing, do refer to this guide to inform CoinGecko of exchanges trading new tokens.
Additionally, for certain decentralized exchanges, CoinGecko generalized some trading pairs. For example, all Uniswap v2 DEX trading pairs will be displayed on CoinGecko as trading only against /ETH. Our algorithm sums up all trading volume for the different trading pairs (/USDC, /ETH, etc) but just displays it as a single line item on the front-end.
Note: We would like to set proper expectations that if the minimum threshold for either liquidity or volume is not met, this would result in the market pair not being reflected for now. This minimum liquidity/volume threshold is an internal criteria that is not disclosed.
Once overall trading volume and liquidity improves, the market pair will automatically be reflected on the Markets section of your page.