Show HN: IsDisposable – Open-source disposable email detection (160K+ domains)

Hi HN, I built this to solve the fake signup problem in SaaS apps.

About 23% of signups use disposable emails from services like Guerrilla Mail and 10MinuteMail. Each costs ~$0.50 in compute and AI credits.

The npm package works fully offline with 160K+ domains in a Set (O(1) lookup, Risk scoring 0-100 using domain age, MX self-referencing patterns, and behavioral signals.

CS student from Pakistan. First real open-source project. Would love feedback on the detection approach.

Source: https://github.com/isdisposable/js Docs: https://isdisposable.com/docs

ong bruh