Developer Tools

x401™

Last updated 2026-06-25 · benchmark measured 2026-08-09 — deterministic & reproducible

x401 is an HTTP protocol extension that adds verifiable identity proof to web requests.

Is x401™ production-ready?

Legit.Show scores x401™ 68 out of 100 — the simple average of its 7 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on x401™ (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Reliability; its weakest is Security. Every frame it averages is published with its evidence on the Legit.Show listing.

The 7 Frames

• Performance — 90/100
• Accessibility — 90/100
• Security — 25/100
• Privacy — 30/100
• Reliability — 100/100
• Standards — 92/100
• Discoverability — 47/100

What we measured

• No Content-Security-Policy and no HSTS.
• Served over HTTPS with a valid certificate.
• Real Lighthouse performance run — 514 ms to first byte.
• Returns a proper 404 for unknown routes.
• 3 of 3 sampled routes reachable.
• No privacy policy found.
• Sets cookies / loads scripts with no consent prompt.

Who it's for

AI agents and autonomous systems · Financial institutions and banking · Healthcare and prescription services · Travel and ticketing platforms · Age-gated and regulated services

Visit x401™ → · Alternatives to x401™ → · How this was measured →