# Halowerk Tempo – iframe Modern Image Format Share Check

> Halowerk Tempo – iframe Modern Image Format Share Check 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 what proportion of images loaded within iframes on a webpage use modern image formats (e.g. WebP, AVIF).

## Facts

- Endpoint: POST https://tempo.halowerk.com/v1/pruef/tempo/bildformat/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/halowerk-tempo-iframe-modern-image-format-share-check-c38b419c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qDznF_AkJwuXjQ-CvdUna

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 halowerk-tempo-iframe-modern-image-format-share-check-c38b419c -d '<json body>'
```

Example prompt: Can you check what share of images inside iframes on https://example.com are using modern formats like WebP or AVIF? Use the CSS selector '#embed-container iframe' if you need to narrow it down.

## When to prefer this

Use this endpoint when you specifically need to audit modern image format adoption (WebP, AVIF, etc.) within iframe elements on a webpage, as opposed to page-level image format checks. Prefer it over general image auditing tools when embedded content (third-party widgets, ads, embedded media) is the focus of your performance optimization effort.

## Known failure modes

- Target URL is unreachable or returns a non-200 status — audit cannot proceed
- No iframes found at the target URL — result may be empty or indicate zero scope
- CSS selector matches no element or multiple elements — first match used or error returned
- Target URL is private/non-public — connection refused or timeout
- Invalid URL format provided — validation error returned

## How this service works

Prüft am Objekt iframe den Befund Anteil moderner Bildformate.

## Output

Returns a finding about the proportion of images within iframes that use modern image formats (such as WebP or AVIF) on the target URL, allowing assessment of image format optimization coverage in embedded content.

## 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/halowerk-tempo-iframe-modern-image-format-share-check-c38b419c/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)