# tempo.halowerk.com – Render-Blocking Resources Check for Images

> tempo.halowerk.com – Render-Blocking Resources Check for Images 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 an image object (bild) for the count of render-blocking resources that affect page load performance.

## Facts

- Endpoint: POST https://tempo.halowerk.com/v1/pruef/tempo/blockierer/bild
- 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-for-images-0caf6648
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ae3F5m9b6trXG3mX_Ow8g

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-for-images-0caf6648 -d '<json body>'
```

Example prompt: Can you check how many render-blocking resources are associated with the image at https://example.com/hero-image.jpg and tell me if it's slowing down the page?

## When to prefer this

Use this endpoint when you specifically need to audit render-blocking resource counts scoped to an image (bild) object on a web page. It is distinct from sibling endpoints that check render-blocking resources for iframes, videos, API responses, or full pages — choose this when the target is an image element and you want granular per-object performance data rather than a whole-page audit.

## Known failure modes

- Invalid or unreachable image URL returns an error or empty result
- CSS selector matches no element, falling back to first matching object
- Malformed URL (non-HTTP/HTTPS) rejected by schema validation
- Timeout if the target server is slow or unresponsive
- Private/internal URLs not publicly accessible will fail to resolve

## How this service works

Prüft am Objekt bild den Befund Zahl renderblockierender Ressourcen.

## Output

Returns a numeric finding (Befund) representing the count of render-blocking resources detected for the specified image object, allowing developers to identify how many scripts or stylesheets are blocking render for that image.

## 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-for-images-0caf6648/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)