Proton does not currently offer CalDAV or CardDAV services, however there is a highly modular platform used by many large companies that allows for simple integration into third party authentication services: Baikal, backed by sabre/dav.
Does Proton have a published API that could be leveraged for authentication? sabre/dav already has a plugin for IMAP, but of course that can’t put targeted to Proton. Many services offer access to their IDP these days, I’m wondering if there is a service like this from Proton as well?
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Proto calendar does have an ics thing. Maybe you can use drive to backup your contacts
Not there. But would be great. At least a way to backup and recover your contacts to a new phone (both Android and iOS). That would be awesome.