I think you should add a playground site link in repo, so that anyone can go and test without installing :)

You probably would have to make an account with a valid personal email, just to trace your prompts.

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, <1ms). The API adds DNS/MX fingerprinting — even when disposable services rotate domains, their mail servers stay the same, so you can catch new ones before any list updates.

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