# Crawlspur Canonical Sitemap HTTP Status Checker

> Crawlspur Canonical Sitemap HTTP Status Checker 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 the HTTP status of the sitemap referenced by a canonical URL object on a given page.

## Facts

- Endpoint: POST https://crawlspur.halowerk.com/v1/pruef/crawlspur/sitemap-status/canonical
- 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-sitemap-http-status-checker-d42d8706
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0TbJkyoMoLywkUDodOAwx

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-sitemap-http-status-checker-d42d8706 -d '<json body>'
```

Example prompt: Check the HTTP status of the sitemap referenced by the canonical tag on https://example.com/blog — I want to know if the sitemap it points to is actually accessible and returning a 200.

## When to prefer this

Use this endpoint when you specifically need to validate the HTTP status of the sitemap referenced via a canonical tag on a given URL, as part of technical SEO auditing. Prefer this over generic HTTP status checkers when the canonical-to-sitemap relationship is the focus, and over full site crawlers when you need a targeted, per-URL check at low cost.

## Known failure modes

- Target URL is unreachable or returns an error — check network accessibility
- Canonical tag not found on the target page — no sitemap reference to evaluate
- Sitemap URL extracted from canonical is malformed or non-HTTP(S)
- Target URL exceeds 2048 character limit
- CSS selector matches no element or multiple elements (first match used)
- Private or firewalled URLs not accessible from the crawler's network

## How this service works

Prüft am Objekt canonical den Befund HTTP-Status der Sitemap.

## Output

Returns the HTTP status code finding for the sitemap referenced by the canonical element on the target URL — e.g. 200 OK, 404 Not Found, 301 redirect, or other HTTP response codes, indicating whether the sitemap is accessible to crawlers.

## 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-sitemap-http-status-checker-d42d8706/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)