Developer Tools
FadSync
Last updated 2026-07-23 · benchmark checked 2026-08-11 · unchanged since 2026-08-08 — deterministic & reproducible
FadSync is an API for detecting disposable and burner email addresses.
Is FadSync production-ready?
Legit.Show scores FadSync 78 out of 100 — the simple average of its 7 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on FadSync (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Privacy; its weakest is Security. Every frame it averages is published with its evidence on the Legit.Show listing.
The 7 Frames
- Performance — 54/100
- Accessibility — 96/100
- Security — 45/100
- Privacy — 100/100
- Reliability — 75/100
- Standards — 92/100
- Discoverability — 85/100
What we measured
- Security headers present: X-Content-Type-Options, Referrer-Policy.
- No Content-Security-Policy and no HSTS.
- Served over HTTPS with a valid certificate.
- Real Lighthouse performance run — 234 ms to first byte.
- 3 of 3 sampled routes reachable.
- Has a reachable privacy policy.
- Sets cookies / loads scripts with no consent prompt.
- Discoverable: sitemap, OpenGraph image, canonical URL.
Who it's for
Developers · SaaS platforms · User authentication systems · Email delivery services · Enterprise security teams
Pricing
Free tier (250 requests/month); Pro $15/month (10K requests/month); Ultra $49/month (50K requests/month); Mega $149/month (250K requests/month); custom enterprise plans available
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