Saucefox — Phase 0 Spike

Verify whether the YouTube account you sign in with is subscribed to a given channel. The Google consent screen requests a single read-only scope and nothing else.

Creator channel ID

Canonical channel ID (starts with UC, 24 characters).

Account picker is always shown, so you can test with a subscribed account, a non-subscribed account, and account switching.

The result is returned as JSON: { subscribed: true | false }.