# Halowerk Tempo – TLS Handshake Time Check for Documents

> Halowerk Tempo – TLS Handshake Time Check for Documents 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 TLS negotiation (handshake) time for a given document URL, checking how long the TLS connection setup takes.

## Facts

- Endpoint: POST https://tempo.halowerk.com/v1/pruef/tempo/tls-zeit/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/halowerk-tempo-tls-handshake-time-check-for-documents-371099f1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q9vY0tqMy6uwDqwDIYU9C

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-tls-handshake-time-check-for-documents-371099f1 -d '<json body>'
```

Example prompt: Can you check how long the TLS handshake takes for the document at https://example.com/report.pdf and tell me if there's a performance issue?

## When to prefer this

Use this endpoint when you specifically need to measure TLS handshake (negotiation) latency for a document resource, as opposed to total page load time or time-to-first-byte. It is ideal for diagnosing whether HTTPS overhead is contributing to slow document delivery, or for automated auditing pipelines that track TLS performance across many document URLs. Prefer sibling endpoints for non-document objects (images, fonts, scripts) or for different performance metrics (TTFB, render start).

## Known failure modes

- Invalid or unreachable URL returns an error or empty result
- Non-HTTPS URLs that don't undergo TLS may return null or an error for TLS handshake time
- Malformed input schema (e.g. empty target address) triggers validation error
- Timeout if the target document server is extremely slow to respond
- CSS selector that matches no element may fall back to first match or return an error

## How this service works

Prüft am Objekt dokument den Befund TLS-Aushandlungszeit.

## Output

The endpoint returns a performance finding (Befund) for the target document, specifically reporting the TLS negotiation (handshake) time — how many milliseconds the TLS connection setup took when fetching the specified document URL. This enables identification of slow TLS configurations or certificate issues impacting load times.

## 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-tls-handshake-time-check-for-documents-371099f1/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)