The prices of the tokens listed on GBEX are derived in terms of their relative pool liquidity to a stablecoin / base coin.
There can be two types of tokens which can be listed on the GlobianceDEX ecosystem - base tokens & listed tokens. Base tokens are the tokens whose prices are taken from a 3rd party price aggregator or decentralized oracles i.e not generated from GlobianceDEX's network of tokens. Listed tokens are the tokens whose prices are not taken from a 3rd party price aggregator or decentralized oracles but are generated from the GlobianceDEX’s network of tokens.
Popular stablecoin, commonly used tokens like XDC are considered as common bases.
More details on which tokens are base token and which token are listed token can be found at https://dex.globiance.com/faq