curl --request GET \
  --url https://api.mudstack.com/workspaces/libraries/stats \
  --header 'Authorization: Bearer <token>' \
  --header 'x-account-id: <x-account-id>' \
  --header 'x-workspace-id: <x-workspace-id>'

{
  "total_files": 123,
  "total_size": 123
}