Legit.Show measured x401™'s Security frame at 25/100. No Content-Security-Policy and no HSTS. Served over HTTPS with a valid certificate.

How does Legit.Show measure x401™?

Legit.Show scores seven frames — Performance, Accessibility, Security, Privacy, Reliability, Standards and Discoverability — deterministically from the public surface (URL, HTTP headers, real Lighthouse), with no LLM in the scoring path. See legit.show/methodology.

Developer Tools

x401™

Last updated 2026-06-25 · benchmark measured 2026-09-22 — deterministic & reproducible

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

69/100

7/7 frames

Top 76% of 14,180 measured

Legit Benchmark — the simple average of 7 measured frames. Frames we could not measure are left out of the average, never counted as zero. Every frame is shown below with its evidence.

Checked 2026-09-22 · scores move as sites change

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To cite this score: legit.show/s/x401-id/2026-09-22. That address never changes; this page moves with every re-measure.

Legit.Show scored x401™ 69/100 on 2026-09-22, measured across all 7 frames from its public surface. legit.show/s/x401-id/2026-09-22

Is x401™ production-ready?

Legit.Show scores x401™ 69 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 — 97/100
Accessibility — 90/100
Security — 25/100
How this compares across the catalogue: The Web Security Baseline
Privacy — 30/100
How this compares across the catalogue: The Privacy Gap
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 — 572 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

Sources and updates

Description: Taken from x401.id's own website on 2026-06-25.
Operator: Notarize, Inc. (dba Proof.com), as named in x401.id's terms, privacy page or footer.
Benchmark: Measured by Legit.Show from the live site, the way any visitor sees it — with no access to its code or accounts. Same method for every product, and no AI decides the score. Last checked 2026-09-22.

Put together from public information, without x401™'s involvement. If anything here is wrong, tell us and a person will check it.

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