{"uid":"cap_302FE46Vaj6U48_uFlrYF","slug":"core-html-seo-analyzer-70cd8dfa","name":"CORE HTML SEO Analyzer","description":"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.","url":"https://92-222-181-125.sslip.io/v1/html/analyze?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"html":{"type":"string","maxLength":65536,"minLength":1,"description":"Raw HTML document or fragment (max 64 KiB)"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_XEPKcySxpdHOZaMiUthS3","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Analyzes raw HTML and returns structured SEO metadata including title, meta description, canonical URL, heading outline, links, JSON-LD blocks, and structural validation checks.","exampleAgentPrompt":"Can you run an SEO audit on this HTML and tell me if the title, meta description, canonical, heading structure, and JSON-LD are all correct — flag any issues like missing H1, wrong heading order, or invalid structured data?","exampleUseCases":[{"title":"Pre-publish SEO page audit","prompt":"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."},{"title":"Heading structure review for blog post","prompt":"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?"},{"title":"Structured data validation pre-launch","prompt":"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."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-17T06:36:01.726Z","isFirstParty":false,"canonicalSlug":"core-html-seo-analyzer-70cd8dfa"}