# agentshelf.syntexa.ch HTTPS URL Scheme Checker

> agentshelf.syntexa.ch HTTPS URL Scheme Checker is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-24).

Checks whether a given URL uses the HTTPS scheme (no network fetch performed)

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-url-https?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-https-url-scheme-checker-f4a493b0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zBpYlGhynJzImhC1tRdLu

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-https-url-scheme-checker-f4a493b0 -d '<json body>'
```

Example prompt: Can you check if 'http://example.com/page' uses the HTTPS scheme — just the URL scheme check, no need to fetch the page?

## When to prefer this

Use this endpoint when you need a fast, deterministic, no-fetch check of whether a URL's scheme is HTTPS — particularly when you cannot or should not make a network request to the URL itself. Prefer the unpaid POST /v1/sandbox/check-url-https if available; use this paid endpoint when the sandbox is not accessible or when a production-grade response is needed.

## Known failure modes

- Empty or missing URL value returns an error
- URL string exceeds 20,000 character limit
- Malformed input that cannot be parsed as a URL may return false or an error
- Service unavailable or payment failure returns a non-200 response

## How this service works

Call when an agent needs whether a URL uses the https scheme. No fetch. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/check-url-https first.

## Output

Returns whether the provided URL uses the HTTPS scheme. No network request is made; the check is purely a string/scheme inspection. Returns a boolean or equivalent indicating HTTPS (true) or not (false).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "description": "JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN."
  },
  "value": {
   "type": "string",
   "examples": [
    "https://example.com/a"
   ],
   "maxLength": 20000,
   "minLength": 1,
   "description": "Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar."
  },
  "schema": {
   "description": "JSON Schema document for schema-check SKUs. Omit it on string checks."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentshelf-syntexa-ch-https-url-scheme-checker-f4a493b0/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)