# tempo.halowerk.com – TTFB Check for Document

> tempo.halowerk.com – TTFB Check for Document 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 the Time to First Byte (TTFB) for a given public HTTP(S) document URL and returns the findings.

## Facts

- Endpoint: POST https://tempo.halowerk.com/v1/pruef/tempo/ttfb/dokument
- 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-ttfb-check-for-document-a8076b64
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JK53t3HQO4BG4P4QbwwGJ

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-ttfb-check-for-document-a8076b64 -d '<json body>'
```

Example prompt: Can you check the time to first byte (TTFB) for https://example.com/report.pdf and tell me how fast the server responds?

## When to prefer this

Use this endpoint when you specifically need to measure Time to First Byte (TTFB) for a document resource (HTML page, PDF, or other document URL) as a focused server-response-time diagnostic. Prefer this over general page-load tools when you need a single, cost-effective TTFB signal rather than a full performance audit, and when the target is a document object type rather than a stylesheet, script, video, or API response.

## Known failure modes

- URL is not publicly accessible or returns a non-2xx status, leading to an error result
- Malformed or missing 'ziel' field causes a validation error
- Target server is unreachable or times out, resulting in no measurement
- Invalid CSS selector causes fallback to first matching element or error
- URL exceeds the 2048 character limit

## How this service works

Prüft am Objekt dokument den Befund Zeit bis zum ersten Byte.

## Output

Returns a performance finding object containing the measured Time to First Byte (TTFB) for the specified document URL, indicating how quickly the server begins sending a response after a request is made.

## 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-ttfb-check-for-document-a8076b64/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)