Show HN: Throwaway – open-source disposable email checker and API

Category: security

Tags: disposable-email, bloom-filter, cloudflare-worker

Score: 6.3/10 (Innovation: 5, Technical: 6, Documentation: 8, Utility: 6)

Throwaway is a Cloudflare Worker that provides a high-speed JSON API for detecting disposable email domains and invalid TLDs, using a compact bloom filter to check 122K+ domains with zero false negatives. Its interesting approach combines edge compute, a probabilistic data structure, and no external calls for sub-millisecond validation, making it a practical tool for signup abuse prevention.

Target audience: backend devs

Repository: https://github.com/sslboard/throwaway · TypeScript · MIT

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