How to Get Global picklist (Global Set) values from API V5

I am working on a project and I need to validate values before updating accounts in zoho CRM.
For regular picklists I am able to obtain the values using the fields API but for the fields that are using global sets
I still get the original values from the local picklist it seems. (This is behavior in the sandbox it seems).

So I am trying to find where in the API I can get all the global sets or global picklists.

Thank you.