# AgentShelf CSS a[hreflang] Extractor

> AgentShelf CSS a[hreflang] Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-29).

Extracts anchor hreflang attribute values (a[hreflang]) from a public URL or raw HTML using CSS selector parsing, with SSRF protection.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/css-a-hreflang?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-css-a-hreflang-extractor-def5dc0b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mH2IQhQJ0_D2_q91FCao2

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-css-a-hreflang-extractor-def5dc0b -d '<json body>'
```

Example prompt: Can you pull all the hreflang values from the anchor tags on https://example.com — I want to see which language and regional variants they're linking to?

## When to prefer this

Use this endpoint when you need to extract hreflang attribute values from anchor tags on a public webpage or a known HTML snippet, especially in SEO auditing, internationalization verification, or competitor analysis workflows. It is SSRF-safe, making it suitable for agent pipelines that fetch external URLs. If you have access to the unpaid sandbox version at POST /v1/sandbox/css-a-hreflang, prefer that first to avoid the $0.004 USDC cost.

## Known failure modes

- URL is unreachable or returns non-200 status — endpoint may return an error or empty result
- SSRF protection blocks access to private/internal IP ranges or localhost URLs
- HTML input exceeds 200,000 character limit — request rejected
- No a[hreflang] elements found on page — returns empty list
- Malformed HTML may result in incomplete or no extraction
- URL exceeds 2048 character length limit — request rejected

## How this service works

Call when an agent needs anchor hreflang values via a[hreflang] from a public page or HTML (SSRF-safe). Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/css-a-hreflang first.

## Output

Returns a list of hreflang attribute values found in anchor (a) elements on the specified page or HTML, indicating language and regional targeting (e.g. 'en-US', 'fr-FR', 'de'). Useful for SEO audits and internationalization checks.

## 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 charset=\"utf-8\"><meta name=\"description\" content=\"Desc\">\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-css-a-hreflang-extractor-def5dc0b/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)