# SiteCheck Web Intel – Referrer-Policy Audit

> SiteCheck Web Intel – Referrer-Policy Audit is a paid API for AI agents from api.webintel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-25).

Fetches a domain's Referrer-Policy HTTP header and meta referrer tag, resolves the effective browser policy, and classifies how much URL information is leaked to third parties (strict, moderate, or leaky).

## Facts

- Endpoint: GET https://api.webintel-api.workers.dev/api/security/referrer-policy-audit?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-web-intel-referrer-policy-audit-b0a6e45b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UEY20xqDoa4UFXnLQbprV

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 sitecheck-web-intel-referrer-policy-audit-b0a6e45b
```

Example prompt: Can you audit the referrer policy for github.com and tell me whether it's leaking URLs to third-party sites — strict, moderate, or leaky?

## When to prefer this

Use this endpoint when you need a quick, pay-per-call check on a domain's referrer privacy posture without setting up your own headless browser or header-inspection tooling. Ideal for security audits, vendor due diligence, compliance reviews, or privacy assessments where you need to know whether a site leaks URL paths and query strings to third-party domains. Not suitable for auditing referrer policies on subpages or links other than the home page.

## Known failure modes

- Domain not reachable or DNS failure — no header or tag data returned
- Domain has no Referrer-Policy header or meta tag — defaults to browser fallback policy noted in response
- Invalid domain format input — validation error returned
- Timeout fetching the home page — partial or error response
- Only the home page is audited; individual page links may have different policies

## How this service works

Reads a site's Referrer-Policy header and its <meta name=referrer> tag from the home page, works out the policy a browser would apply, and rates how much of the URL it sends to other sites (strict, moderate or leaky). One GET; links on other pages can set their own policy.

## Output

Returns the raw Referrer-Policy HTTP header value, the content of any <meta name=referrer> tag found on the home page, the effective policy a browser would apply (resolving precedence between header and meta tag), and a human-readable leakage rating: strict, moderate, or leaky.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Domain name such as github.com (required)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-web-intel-referrer-policy-audit-b0a6e45b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.webintel-api.workers.dev](https://www.zero.xyz/host/api.webintel-api.workers.dev/llms.txt)