# CYRE Guardian Host Hygiene Check

> CYRE Guardian Host Hygiene Check is a paid API for AI agents from cyre.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Evaluates a URL's host for hygiene signals (HTTPS, IP-based host, TLD shape, self-pay patterns) before an agent pays a resource URL

## Facts

- Endpoint: GET https://cyre.dev/api/host
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cyre-guardian-host-hygiene-check-3de4a561
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qw_9c0JIGA92chxQ2S3Ye

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 cyre-guardian-host-hygiene-check-3de4a561
```

Example prompt: Before I pay for that x402 resource at https://example-skill.io/api/data, run a host hygiene check on it — I want to know if it's using HTTPS properly, whether it's IP-based, and if the TLD looks sketchy.

## When to prefer this

Use this endpoint when you need a fast, lightweight pre-payment host check based purely on structural/pattern signals (HTTPS, IP vs. named host, TLD shape, self-pay patterns) and do not need historical blacklist data or full counterparty risk scoring. Ideal as a first-pass gate before calling heavier risk endpoints like Guardian Pay-route Oracle or Guardian Bazaar Scan.

## Known failure modes

- Missing or invalid 'url' query parameter returns an error
- Non-HTTP type value rejected by schema
- HTTP method not in allowed enum (GET, HEAD, DELETE) causes validation failure
- Malformed URL that cannot be parsed into host components may return an error or empty signals
- Network timeout if host probe is required

## How this service works

Guardian Host Brief — before you pay a resource URL, measure host hygiene (https, IP host, TLD shape, self-pay). No historical blacklist — patterns only. Agent guide: https://cyre.dev/SKILL.md

## Output

Returns a host hygiene brief covering pattern-based signals: whether the host uses HTTPS, whether the host is IP-based rather than a named domain, TLD shape assessment, and self-pay pattern detection. No historical blacklist data — purely structural/pattern analysis of the host at call time.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cyre-guardian-host-hygiene-check-3de4a561/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cyre.dev](https://www.zero.xyz/host/cyre.dev/llms.txt)