Technical SEO audit of a public page as a crawler first sees it: indexability, robots.txt, title and description length, canonical, viewport, headings, alt text, links, Open Graph, JSON-LD, mixed content, redirects, speed and the sitemap - each finding with a severity, plus a 0-100 score. JavaScript is not run. Pay-per-call via x402. An empty body is answered for the published example page (https://example.com/); send {"url":"https://…"} for any other page.