# Crawlspur Video Self-Referencing Canonical Check

> Crawlspur Video Self-Referencing Canonical Check 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 video page's canonical tag correctly points to itself (self-referencing canonical validation).

## Facts

- Endpoint: POST https://crawlspur.halowerk.com/v1/pruef/crawlspur/canonical-selbst/video
- 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-video-self-referencing-canonical-check-5f5511eb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FF0ge7HJTvgnjWfEvuhsF

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-video-self-referencing-canonical-check-5f5511eb -d '<json body>'
```

Example prompt: Check whether the video page at https://example.com/video/my-product-demo has a self-referencing canonical tag — I want to know if the canonical URL on that page points back to itself.

## When to prefer this

Use this endpoint when you need to programmatically verify that a specific video page's canonical tag points back to itself — particularly useful in technical SEO audits, CI/CD pipelines for content sites, or automated monitoring of video content pages. Prefer this over generic HTML parsers when you want a structured pass/fail SEO finding without building custom extraction logic.

## Known failure modes

- URL is not publicly accessible or returns a non-2xx HTTP status
- Video page does not contain any canonical tag — finding returns absent/missing
- CSS selector provided matches no element on the page
- Canonical URL found but points to a different resource — flagged as non-self-referencing
- Malformed or invalid URL supplied in the ziel field
- Timeout or network error reaching the target URL

## How this service works

Prüft am Objekt video den Befund selbstreferenzierende kanonische Adresse.

## Output

Returns a structured finding indicating whether the video page at the given URL has a self-referencing canonical tag, including the detected canonical URL value and a pass/fail verdict on whether it matches the target 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-video-self-referencing-canonical-check-5f5511eb/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)