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CORE HTML SEO Analyzer
x402
CORE HTML SEO Analyzer is a paid API for AI agents from 92-222-181-125.sslip.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-17).
Analyzes raw HTML and returns structured SEO metadata including title, meta description, canonical URL, heading outline, links, JSON-LD blocks, and structural validation checks.
Price / call$0.003
Success—
StatusUnknown
How this service works
Analyze raw HTML you provide and get structured SEO data as JSON: title, meta description, canonical, H1-H6 outline, links, JSON-LD blocks and structural checks (single H1, heading order, duplicates, JSON-LD validity). Use it to audit a page before publishing. No URL fetching, no JavaScript execution. Max 64 KiB of HTML.
Output
A JSON object containing: extracted page title, meta description, canonical URL, a nested H1–H6 heading outline, arrays of internal and external links, parsed JSON-LD script blocks, and a set of structural checks indicating whether a single H1 exists, headings are in correct order, no duplicates are present, and JSON-LD blocks are valid.
Example use cases
Pre-publish SEO page audit
“Here's the full HTML for my new landing page — check the SEO basics: title tag, meta description, canonical URL, heading hierarchy (make sure there's exactly one H1 and headings are in order), and validate any JSON-LD blocks before I publish it.”
Heading structure review for blog post
“I just finished writing this blog post HTML and I want to make sure the H1 through H4 headings are in the right order with no duplicates or skipped levels — can you analyze the heading outline for me?”
Structured data validation pre-launch
“Check this product page HTML for valid JSON-LD schema markup — I need to know if the structured data blocks are well-formed and what types they declare before we push this to production.”
Technical details
Endpoint
POSThttps://92-222-181-125.sslip.io/v1/html/analyze?utm_source=zero.xyzWhen to prefer
Use this endpoint when you have raw HTML content and need a fast, structured SEO audit without fetching any URLs or executing JavaScript. Ideal for pre-publish checks in a CMS pipeline, static site generator, or content workflow where you already have the HTML string and need immediate JSON-formatted SEO diagnostics including heading validation and JSON-LD verification.
Side effects
- HTML exceeding 64 KiB returns a size validation error
- Empty or missing html field returns a 400 bad request
- Malformed or non-UTF-8 HTML may produce incomplete extractions
- JSON-LD blocks with syntax errors are flagged as invalid rather than parsed
- Fragments missing head section will show null for title, meta description, and canonical
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| html | string | Raw HTML document or fragment (max 64 KiB) |
Tags
x402
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