# Tempo Halowerk TLS Negotiation Time Checker (API Response)

> Tempo Halowerk TLS Negotiation Time Checker (API Response) 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 and evaluates the TLS handshake/negotiation time for a given API endpoint URL.

## Facts

- Endpoint: POST https://tempo.halowerk.com/v1/pruef/tempo/tls-zeit/api-antwort
- 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/tempo-halowerk-tls-negotiation-time-checker-api-response-d446d18d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ym5Fx-5R6xqcmj-1ZZZSi

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-tls-negotiation-time-checker-api-response-d446d18d -d '<json body>'
```

Example prompt: Can you check how long the TLS handshake is taking for my API at https://api.example.com/v1/data and tell me if it's slow?

## When to prefer this

Use this endpoint when you specifically need to isolate and measure the TLS handshake/negotiation phase of an API connection, rather than total page load time or DNS resolution time. It is ideal for diagnosing SSL/TLS-related latency in API integrations, certificate performance audits, or monitoring changes in TLS setup speed over time.

## Known failure modes

- Target URL is unreachable or returns a connection error
- Invalid or malformed URL provided
- TLS handshake fails due to certificate issues
- Timeout if the target server is unresponsive
- Non-public or private IP address rejected

## How this service works

Prüft am Objekt api-antwort den Befund TLS-Aushandlungszeit.

## Output

Returns a performance finding (Befund) representing the measured TLS negotiation/handshake time for the target API endpoint, expressed as a timing metric that can be used to assess connection setup speed.

## 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-tls-negotiation-time-checker-api-response-d446d18d/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)