# Tempo Halowerk – Render-Blocking Resources Check for iFrame

> Tempo Halowerk – Render-Blocking Resources Check for iFrame 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).

Analyzes an iframe object at a given URL and returns the count of render-blocking resources detected within it.

## Facts

- Endpoint: POST https://tempo.halowerk.com/v1/pruef/tempo/blockierer/iframe
- 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-render-blocking-resources-check-for-iframe-06e8352e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Yji-E5Gvtz1yD3ug-5vdJ

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-render-blocking-resources-check-for-iframe-06e8352e -d '<json body>'
```

Example prompt: Check how many render-blocking resources are inside the iframe at https://example.com/embed — use the iframe element matched by the CSS selector '#main-embed' and report the count.

## When to prefer this

Use this endpoint when you specifically need to measure render-blocking resources scoped to an iframe element rather than a full page or other resource type. It is ideal for isolating third-party embeds, ad slots, or widget iframes that may independently introduce performance bottlenecks without affecting whole-page metrics. Choose sibling endpoints for full-page, video, or API response analyses.

## Known failure modes

- Invalid or non-public URL returns an error or empty result
- CSS selector matches no element or multiple elements — first match is used or error returned
- Target URL is unreachable or returns non-200 HTTP status
- iframe contains no detectable resources (count returns 0 but may indicate access restrictions)
- Malformed input schema (missing required 'ziel' field) causes request rejection

## How this service works

Prüft am Objekt iframe den Befund Zahl renderblockierender Ressourcen.

## Output

Returns the number of render-blocking resources (scripts, stylesheets, etc.) found within the specified iframe object at the given URL, giving developers a concrete metric to guide optimization efforts.

## 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-render-blocking-resources-check-for-iframe-06e8352e/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)