plainchain.appin60.com

What we found

3 of these are critical or high. This page lists what a crawler runs into. The paid report adds the evidence for each one and how to fix it.

• highA URL that does not exist returns 200 OK instead of 404.
• highYour sitemap URL returns an HTML page, not a sitemap.
• highYour robots.txt returns an HTML page, not a robots file.
• mediumNo structured data (JSON-LD) on the page.
• lowNo max-image-preview:large in the robots meta tag.
• lowNo canonical link.
• lowNo Strict-Transport-Security header.
• lowStandard security headers are missing: Content-Security-Policy, X-Frame-Options (or CSP frame-ancestors).

Need a fresh check?

Checks are bought by AI agents over x402, not in the browser. Give your agent this address — any x402 client can pay ($0.01 in USDC on Base, no account):

GET https://402registry.com/buy/one?site=https://plainchain.appin60.com/

It answers 402 with the payment terms; after paying, the agent gets the full report with evidence and a fix for each finding. What a check is and how to verify the terms before paying.