# agentshelf.syntexa.ch Profile Referrer Extractor

> agentshelf.syntexa.ch Profile Referrer Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-23).

Extracts the referrer meta tag value from a public web page URL or raw HTML, with SSRF protection.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/profile-referrer?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-profile-referrer-extractor-87a586d7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_q_bKF9jFd6lJBjmgnBo7_

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-profile-referrer-extractor-87a586d7 -d '<json body>'
```

Example prompt: Can you extract the referrer meta tag value from https://example.com/profile — I need to know what referrer policy that page declares in its HTML head?

## When to prefer this

Use this endpoint when you need to specifically extract the referrer meta tag value from a page or HTML blob, with guaranteed SSRF safety (no internal network access). Prefer the free sandbox POST /v1/sandbox/profile-referrer endpoint first to avoid the $0.008 USDC charge during development or testing.

## Known failure modes

- URL is not publicly accessible or returns non-200 status
- HTML input exceeds 200,000 character limit
- URL is too short (< 8 chars) or too long (> 2048 chars)
- SSRF protection blocks private/internal IP addresses
- No referrer meta tag found in the page HTML
- Malformed HTML that cannot be parsed
- Network timeout when fetching the URL

## How this service works

Call when an agent needs the referrer meta value extracted from a public page or HTML (SSRF-safe). Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/profile-referrer first.

## Output

Returns the extracted value of the referrer meta tag (e.g. 'no-referrer', 'origin', 'strict-origin-when-cross-origin') found in the page's HTML head section. If no referrer meta tag is present, returns null or an empty result.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "maxLength": 2048,
   "minLength": 8,
   "description": "Public page to fetch. The selector or profile is fixed by the SKU. Provide url or html."
  },
  "html": {
   "type": "string",
   "examples": [
    "<!doctype html><html lang=\"en\"><head><title>Hello</title>\n<meta name=\"description\" content=\"Desc\"><meta property=\"og:title\" content=\"OG\">\n<link rel=\"canonical\" href=\"https://example.com/\"><link rel=\"icon\" href=\"/favicon.ico\">\n</head><body><h1>Hello</h1><a href=\"https://example.com/a\">A</a></body></html>"
   ],
   "maxLength": 200000,
   "minLength": 1,
   "description": "HTML to extract from locally. Provide html or url. When both are set, html is used."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentshelf-syntexa-ch-profile-referrer-extractor-87a586d7/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)