The API is deployed across multiple zones:
bg-sof-1. When performing a compute call, you should use the relevant zone for your resource.
For example: https://api-de-fra-1.exoscale.com/v2/instance would return only the instances from
de-fra-1, https://api-ch-gva-2.exoscale.com/v2/instance from
To obtain a list of all instances across all zones, you would need to do the corresponding request per zone.
Note that if no zone is specified during the call
ch-gva-2 will be used by default.