# tempo.halowerk.com – Font Total Load Time Check

> tempo.halowerk.com – Font Total Load Time 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 and measures the total load time (Gesamtladezeit) for font resources on a given URL or web object.

## Facts

- Endpoint: POST https://tempo.halowerk.com/v1/pruef/tempo/gesamtzeit/schrift
- 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-font-total-load-time-check-622f2a79
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6oAI8YpjtUUO-C1hF2bnL

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-font-total-load-time-check-622f2a79 -d '<json body>'
```

Example prompt: Can you check the total font load time for https://example.com and tell me how long it takes for all fonts to finish loading?

## When to prefer this

Use this endpoint when you specifically need to measure the total end-to-end load time of font resources on a page, as opposed to time-to-first-byte or connection setup time for fonts. Prefer this over general page speed tools when font loading is the specific performance bottleneck under investigation. It is particularly useful when auditing web typography performance or diagnosing render-blocking font issues.

## Known failure modes

- Target URL is unreachable or returns a non-200 status — endpoint may return an error or null result
- Invalid CSS selector provided — may return first matching element or an error
- Private/non-public IP addresses or intranet URLs rejected
- Malformed URL input causing validation failure
- Font resources blocked by CORS or firewall may result in incomplete timing data

## How this service works

Prüft am Objekt schrift den Befund Gesamtladezeit.

## Output

Returns a performance finding (Befund) for the total load time of font resources on the target URL or element, including timing metrics indicating how long fonts took to fully load.

## 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-font-total-load-time-check-622f2a79/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)