# tempo.halowerk.com – Modern Image Format Share Check (Page)

> tempo.halowerk.com – Modern Image Format Share Check (Page) 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 page for the proportion of images served in modern formats (e.g. WebP, AVIF) versus legacy formats.

## Facts

- Endpoint: POST https://tempo.halowerk.com/v1/pruef/tempo/bildformat/seite
- 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-modern-image-format-share-check-page-5ed0fa8f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Am0S1gA-auTxTGTNcmOC0

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-modern-image-format-share-check-page-5ed0fa8f -d '<json body>'
```

Example prompt: Can you check https://www.example.com/products and tell me what share of images are served in modern formats like WebP or AVIF?

## When to prefer this

Use this endpoint when you need to specifically measure the adoption of modern image formats (WebP, AVIF, etc.) on a given web page, as part of a performance or optimization audit. It is purpose-built for page-level image format analysis rather than general performance scoring or full Lighthouse-style audits.

## Known failure modes

- Invalid or unreachable URL returns an error — ensure the target is a publicly accessible HTTPS address
- CSS selector matching zero or multiple elements may fall back to the first match or return an error
- Pages behind authentication or paywalls may not be fully analyzable
- Rate limiting or bot protection on the target page may cause incomplete results
- Malformed input schema (missing required 'ziel' field) returns a validation error

## How this service works

Prüft am Objekt seite den Befund Anteil moderner Bildformate.

## Output

Returns a performance finding for the target page indicating the share (proportion or percentage) of images served in modern formats such as WebP or AVIF, enabling assessment of image optimization maturity.

## 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-modern-image-format-share-check-page-5ed0fa8f/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)