# CrawlSpur Canonical Self-Reference Check for Pagination

> CrawlSpur Canonical Self-Reference Check for Pagination 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 pagination page URL has a self-referencing canonical tag pointing to itself

## Facts

- Endpoint: POST https://crawlspur.halowerk.com/v1/pruef/crawlspur/canonical-selbst/paginierung
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crawlspur-canonical-self-reference-check-for-pagination-026ff557
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iFcTnu8-_f9Y7SkgMIpoZ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability crawlspur-canonical-self-reference-check-for-pagination-026ff557 -d '<json body>'
```

Example prompt: Check if the pagination page at https://example.com/blog?page=2 has a self-referencing canonical tag pointing to itself.

## When to prefer this

Use this endpoint when you specifically need to verify that a paginated page carries a self-referencing canonical tag as part of an SEO audit. Prefer this over generic HTML scrapers when you need a structured pass/fail finding specifically for canonical self-reference on pagination objects, without building your own HTML parsing logic.

## Known failure modes

- URL is not publicly accessible, returning a network or HTTP error
- Page does not contain any canonical tag, resulting in a missing/null finding
- CSS selector matches no element or returns an ambiguous result
- URL is malformed or exceeds max length of 2048 characters
- Target page returns a non-HTML response (e.g. PDF, redirect loop)
- Domain or IP not publicly resolvable

## How this service works

Prüft am Objekt paginierung den Befund selbstreferenzierende kanonische Adresse.

## Output

Returns an audit finding indicating whether the given pagination URL contains a self-referencing canonical tag (i.e., a canonical link element pointing to the page's own URL), including the detected canonical URL value and whether it matches the requested URL.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "ziel": {
   "oneOf": [
    {
     "type": "string",
     "maxLength": 2048,
     "minLength": 1,
     "description": "Öffentliche HTTP(S)-Adresse; bei DNS-Befunden Domain oder öffentliche IP."
    },
    {
     "type": "object",
     "required": [
      "adresse"
     ],
     "properties": {
      "adresse": {
       "type": "string",
       "maxLength": 2048,
       "minLength": 1
      },
      "selektor": {
       "type": "string",
       "maxLength": 240,
       "minLength": 1,
       "description": "CSS-Selektor: genau ein Objekt, sonst erster Treffer des Objektfilters."
      },
      "vergleich": {
       "type": "string",
       "maxLength": 2048,
       "description": "Öffentliche Vergleichsadresse für Link-, Sitemap- oder Sprachbefunde."
      },
      "user_agent": {
       "type": "string",
       "pattern": "^[A-Za-z0-9_-]{1,80}$"
      },
      "dkim_selektor": {
       "type": "string",
       "pattern": "^[A-Za-z0-9_-]{1,63}$"
      }
     },
     "additionalProperties": false
    }
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crawlspur-canonical-self-reference-check-for-pagination-026ff557/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from crawlspur.halowerk.com](https://www.zero.xyz/host/crawlspur.halowerk.com/llms.txt)