On-Page SEO Audit & Checker

x402

On-Page SEO Audit & Checker is a paid API for AI agents from agent-data.centorprat.workers.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-30).

Crawls up to 3 URLs per call and returns a scored, graded on-page SEO audit with prioritized fixes covering title, meta, headings, canonical, structured data, and more.

Price / call$0.03

Seller volume →—

Success—

StatusUnknown

How this service works

Pay-per-call data and tools for AI agents, $0.002-0.01 per call in USDC via x402 (Base, Polygon or Solana), no account or API key; MAX tiers ($0.05-0.25) run deeper jobs. Agent toolkit: web search, search + read top pages, any page as clean markdown with a prompt-injection check, which-x402-API-to-call recommender, seller check. Data: Google Maps places with contacts, YouTube video data and transcripts, job listings (Indeed, LinkedIn, 13 boards), Google Ads Transparency, TikTok comments, Pinterest, Airbnb, Redfin, AliExpress, app stores, live sports, website and SEO checks, Shopify store tech stacks, and onchain token / address risk checks.

Output

Returns one SEO report per URL containing: an overall score and letter grade, pass/fail checks for title tag, meta description, H1/H2 headings, canonical tag, robots meta, Open Graph tags, structured data (JSON-LD/schema), image alt attributes, internal/external links, viewport meta tag, sitemap availability, and robots.txt; plus a prioritized list of actionable fixes ordered by impact.

Example use cases

Pre-launch SEO health check

“Before we launch this new landing page, can you audit https://acme.com/new-product for on-page SEO — I want to see the score, whether the title and meta description are good, and what the most important things to fix are?”

Competitor page SEO comparison

“Audit https://competitor.com and https://competitor.com/features for on-page SEO and tell me what grades they're getting, how their headings are structured, and whether they're using structured data or Open Graph tags.”

Blog post SEO review

“I just published a new blog post at https://myblog.com/best-coffee-makers — can you check its on-page SEO, including the title tag, meta description, image alt text, and canonical tag, and give me a prioritized list of fixes?”

Technical details

Endpoint

POSThttps://agent-data.centorprat.workers.dev/tools/on-page-seo-audit?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a fast, keyless, structured on-page SEO audit for up to 3 URLs at once with no API key setup — ideal for agents checking SEO health before publishing, diagnosing ranking issues, or comparing pages. Prefer this over generic HTML scrapers when you specifically need scored SEO signals (title, meta, canonical, structured data, OG tags) rather than raw page content.

Side effects

URL is unreachable or returns a non-200 status — that URL's audit is skipped and not charged
URL resolves to a non-HTML resource (PDF, image) — audit may be incomplete or skipped
More than 3 URLs submitted — request rejected per maxItems constraint
Malformed URL string — validation error returned
Page is JavaScript-rendered SPA with no server-side HTML — crawl may miss dynamic content
robots.txt disallows crawling — results may be partial or flagged

Input

Schema · Request body

Field	Type	Description
urls	array	Pages to audit, e.g. ["https://your-site.com", "https://your-site.com/pricing"]. One SEO report per URL.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "items": [
      {
        "url": "https://www.python.org/",
        "grade": "A",
        "score": 90,
        "checks": [
          {
            "check": "title",
            "detail": "Title (21 chars): Welcome to Python.org",
            "status": "pass"
          },
          {
            "check": "metaDescription",
            "detail": "Meta description (52 chars).",
            "status": "pass"
          },
          {
            "check": "h1",
            "detail": "5 <h1> tags (ideal: 1).",
            "status": "warn"
          },
          {
            "check": "indexable",
            "detail": "Indexable (no noindex).",
            "status": "pass"
          },
          {
            "check": "canonical",
            "detail": "No canonical link - duplicate-content risk.",
            "status": "warn"
          },
          {
            "check": "https",
            "detail": "Served over HTTPS.",
            "status": "pass"
          },
          {
            "check": "viewport",
            "detail": "Mobile viewport set.",
            "status": "pass"
          },
          {
            "check": "openGraph",
            "detail": "Open Graph tags present.",
            "status": "pass"
          },
          {
            "check": "structuredData",
            "detail": "Structured data: SearchAction, WebSite",
            "status": "pass"
          },
          {
            "check": "imageAlt",
            "detail": "All 1 images have alt text.",
            "status": "pass"
          },
          {
            "check": "contentLength",
            "detail": "1116 words of content.",
            "status": "pass"
          },
          {
            "check": "langAttribute",
            "detail": "html lang=en",
            "status": "pass"
          },
          {
            "check": "sitemap",
            "detail": "No sitemap.xml found.",
            "status": "warn"
          },
          {
            "check": "robotsTxt",
            "detail": "robots.txt found.",
            "status": "pass"
          },
          {
            "check": "favicon",
            "detail": "Favicon declared.",
            "status": "pass"
          }
        ],
        "onPage": {
          "h1": [
            "Functions Defined",
            "All the Flow You’d Expect",
            "Compound Data Types"
          ],
          "lang": "en",
          "https": true,
          "title": "Welcome to Python.org",
          "images": 1,
          "charset": true,
          "favicon": true,
          "headings": {
            "h1": 5,
            "h2": 9,
            "h3": 0,
            "h4": 0,
            "h5": 0,
            "h6": 0
          },
          "viewport": true,
          "canonical": null,
          "indexable": true,
          "openGraph": {
            "image": true,
            "title": true,
            "description": true
          },
          "robotsTxt": true,
          "wordCount": 1116,
          "metaRobots": null,
          "sitemapXml": false,
          "titleLength": 21,
          "twitterCard": false,
          "externalLinks": 78,
          "hreflangCount": 0,
          "internalLinks": 128,
          "metaDescription": "The official home of the Python Programming Language",
          "imagesMissingAlt": 0,
          "structuredDataTypes": [
            "SearchAction",
            "WebSite"
          ],
          "metaDescriptionLength": 52
        },
        "passed": 12,
        "signal": "needs-improvement",
        "status": 200,
        "fetched": true,
        "failures": 0,
        "finalUrl": "https://www.python.org/",
        "findings": [
          "5 <h1> tags (ideal: 1).",
          "No canonical link - duplicate-content risk.",
          "No sitemap.xml found."
        ],
        "warnings": 3,
        "checkedAt": "2026-10-24T13:49:32+00:00"
      }
    ]
  }
}

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