# Halowerk Tempo – TLS Negotiation Time Check for Pages

> Halowerk Tempo – TLS Negotiation Time Check for Pages is a paid API for AI agents from tempo.halowerk.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-16).

Measures the TLS handshake negotiation time for a given web page URL, returning a performance finding for the 'seite' (page) object type.

## Facts

- Endpoint: POST https://tempo.halowerk.com/v1/pruef/tempo/tls-zeit/seite
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-tempo-tls-negotiation-time-check-for-pages-9907e2be
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_R-5VV1tnthOctYEp152Xz

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-negotiation-time-check-for-pages-9907e2be -d '<json body>'
```

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

## When to prefer this

Use this endpoint when you specifically need to isolate and measure the TLS handshake phase of a web page's connection time, as part of a web performance audit or HTTPS infrastructure diagnosis. Prefer it over generic page-speed tools when TLS/SSL negotiation latency is the specific metric of interest. Sibling endpoints on the same provider cover other timing metrics like TTFB and render start.

## Known failure modes

- Invalid or unreachable URL returns an error finding
- Non-HTTPS URLs may not produce a TLS timing result
- URL exceeding 2048 characters is rejected by schema validation
- CSS selector matching zero or multiple elements may produce unexpected scoping
- Network timeouts if the target server is unresponsive

## How this service works

Prüft am Objekt seite den Befund TLS-Aushandlungszeit.

## Output

Returns a performance finding containing the measured TLS handshake negotiation time for the specified page URL, indicating how long the TLS negotiation phase took during connection setup.

## 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-negotiation-time-check-for-pages-9907e2be/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)