# agentshelf.syntexa.ch TLS Cipher Security Check

> agentshelf.syntexa.ch TLS Cipher Security Check is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-02).

Checks whether the negotiated TLS cipher on port 443 excludes weak/prohibited algorithms (NULL, EXPORT, RC4, DES)

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/tls-cipher?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-tls-cipher-security-check-a2365074
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_u-UFo9yLIKDUJKDS7LhGI

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 agentshelf-syntexa-ch-tls-cipher-security-check-a2365074 -d '<json body>'
```

Example prompt: Can you check whether api.example.com is negotiating a weak TLS cipher on port 443 — specifically whether it excludes NULL, EXPORT, RC4, and DES ciphers?

## When to prefer this

Use this endpoint when you need a quick, paid cipher-suite security check for a specific host or URL and the free sandbox POST /v1/sandbox/tls-cipher is unavailable or exhausted. Ideal for automated security auditing pipelines, compliance checks against PCI-DSS or similar standards that prohibit NULL/EXPORT/RC4/DES ciphers, and verifying third-party or partner server security posture.

## Known failure modes

- Host unreachable or not listening on port 443 — connection timeout error
- Invalid or malformed hostname/URL input — validation error
- Server uses TLS but refuses connection probe — handshake error
- Host resolves but certificate issues prevent cipher inspection
- Rate limiting or payment failure — 402 or 429 response

## How this service works

Call when an agent needs whether the negotiated cipher on port 443 excludes NULL, EXPORT, RC4, and DES. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/tls-cipher first.

## Output

Returns whether the TLS cipher negotiated on port 443 excludes prohibited weak algorithms (NULL, EXPORT, RC4, DES), along with the cipher suite name and security assessment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "maxLength": 2048,
   "minLength": 8,
   "description": "Public URL whose hostname is inspected. Provide url or host. Private targets are rejected."
  },
  "host": {
   "type": "string",
   "examples": [
    "example.com"
   ],
   "maxLength": 253,
   "minLength": 1,
   "description": "Public hostname such as example.com. The port and check are fixed by the SKU. Provide host or url."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentshelf-syntexa-ch-tls-cipher-security-check-a2365074/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)