# tempo.halowerk.com – Render-Blocking Resources Check (Document)

> tempo.halowerk.com – Render-Blocking Resources Check (Document) is a paid API for AI agents from tempo.halowerk.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Checks a web document (HTML page) for the number of render-blocking resources it loads, such as blocking scripts or stylesheets.

## Facts

- Endpoint: POST https://tempo.halowerk.com/v1/pruef/tempo/blockierer/dokument
- 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/tempo-halowerk-com-render-blocking-resources-check-document-b33060f6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O5_3lTPIeTQWBlCepG-Vn

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 tempo-halowerk-com-render-blocking-resources-check-document-b33060f6 -d '<json body>'
```

Example prompt: Can you check how many render-blocking resources are on https://www.example.com and tell me what's slowing down the page render?

## When to prefer this

Use this endpoint when you need to programmatically audit a specific HTML document for the count of render-blocking resources as part of a web performance, SEO, or Core Web Vitals workflow. It is purpose-built for document-level render-blocking analysis, as opposed to sibling endpoints that check iframes, scripts, images, or fonts separately.

## Known failure modes

- URL is not publicly accessible or returns a non-2xx HTTP status
- Malformed or unreachable target address provided in 'ziel'
- CSS selector provided matches no element or multiple elements (first match used)
- Timeout fetching or rendering the target document
- URL exceeds 2048 character limit

## How this service works

Prüft am Objekt dokument den Befund Zahl renderblockierender Ressourcen.

## Output

Returns a structured audit finding (Befund) for the target document, reporting the count of render-blocking resources detected on the page — such as blocking JavaScript or CSS files that delay the first paint of the document.

## 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/tempo-halowerk-com-render-blocking-resources-check-document-b33060f6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tempo.halowerk.com](https://www.zero.xyz/host/tempo.halowerk.com/llms.txt)