As of right now, Coinbase does not have 0Chain. 0Chain is a project that is still in development and has yet to be released.
While Coinbase has been known to list new projects and coins before they are released (such as with Basic Attention Token), it is unclear if they will do the same with 0Chain. .
0Chain is a project that aims to provide a decentralized cloud storage solution. The team behind 0Chain is still working on the project and has not yet released it.
As such, Coinbase does not currently have 0Chain listed on its platform. It is possible that Coinbase will list 0Chain in the future, but this has not been confirmed.