Testing Proton Pass API Without Knowing Its Architecture

I took a real Proton Pass API request straight from the browser and ran it through Rentgen.

No architecture knowledge. No configs. No scripts. Just import cURL → generate tests → wait a minute.

The result? Rentgen surfaced protocol-level signals around:

- Large payload handling

- Authentication gate ordering

- Route semantics (404 vs 405)

- OPTIONS method clarity

This isn’t a “security drama” post. Proton builds serious products. But even mature APIs can benefit from deterministic hygiene checks before automation ever starts.

Full breakdown here: https://rentgen.io/api-stories/protonpass-api-under-rentgen.html