# Halowerk Tempo – Image Transferred Bytes Check

> Halowerk Tempo – Image Transferred Bytes 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).

Measures and reports the total number of bytes transferred when loading an image resource at a given URL.

## Facts

- Endpoint: POST https://tempo.halowerk.com/v1/pruef/tempo/gewicht/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/halowerk-tempo-image-transferred-bytes-check-8df94cb1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dkJ_7UsecJORRW7LmCKPZ

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-image-transferred-bytes-check-8df94cb1 -d '<json body>'
```

Example prompt: Can you check how many bytes are transferred when loading the hero image at https://example.com/images/hero.jpg — I want to know if it's too heavy for performance?

## When to prefer this

Choose this endpoint when you specifically need to measure the transferred byte size of an image resource on a webpage, as opposed to measuring total page weight or loading time. It is ideal for targeted image optimization audits where you want to isolate the payload size of a single image asset.

## Known failure modes

- URL is not publicly accessible or returns a non-200 HTTP status
- Provided CSS selector matches no image element or is ambiguous
- Image resource is blocked by authentication or access restrictions
- Request times out if the target server is unreachable
- Invalid or malformed URL input causes a validation error

## How this service works

Prüft am Objekt bild den Befund übertragene Bytemenge.

## Output

Returns a performance finding indicating the total number of bytes transferred when fetching the specified image resource, helping identify whether the image is within acceptable weight thresholds for web performance.

## 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-image-transferred-bytes-check-8df94cb1/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)