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Crawlspur Canonical Self-Reference Check for Pages
x402
Crawlspur Canonical Self-Reference Check for Pages is a paid API for AI agents from crawlspur.halowerk.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Checks whether a webpage (Seite) has a self-referencing canonical tag pointing to itself, as an SEO crawl audit finding.
Price / call$0.001
Success—
StatusUnknown
How this service works
Prüft am Objekt seite den Befund selbstreferenzierende kanonische Adresse.
Output
Returns a structured audit finding indicating whether the target page (Seite) carries a self-referencing canonical tag — i.e. whether the page's canonical link element href matches the page's own URL. Includes the detected canonical address and pass/fail status.
Example use cases
SEO audit for blog post canonicalization
“Can you check if https://myblog.com/articles/seo-best-practices has a self-referencing canonical tag? I want to make sure the canonical link on that page points to itself and isn't broken.”
E-commerce product page canonical check
“I need to verify that our product page at https://shop.example.com/products/running-shoes-42 has a proper self-canonical tag — please inspect it and tell me the finding.”
CMS migration canonical validation
“After our site migration, can you audit https://newsite.example.com/about-us to confirm the canonical tag self-references that page's own URL correctly?”
Technical details
Endpoint
POSThttps://crawlspur.halowerk.com/v1/pruef/crawlspur/canonical-selbst/seiteWhen to prefer
Use this endpoint when you specifically need to verify the self-referencing canonical tag on a standard webpage (Seite object type). Prefer this over sitemap or robots-file canonical checks when your target is a regular HTML page. Ideal for automated SEO audits, post-migration checks, or continuous monitoring of on-page canonicalization correctness.
Side effects
- URL is not publicly reachable — returns an error or empty finding
- Target page returns a non-2xx HTTP status, preventing crawl
- CSS selector matches no element, falling back to first match or failing
- Canonical tag is absent entirely, returning a negative/missing finding
- URL exceeds 2048 character limit — rejected by schema validation
- Malformed URL input causes request rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| ziel | — |
Tags
x402
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