# CSS Source[src] Extractor

> CSS Source[src] Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-29).

Extracts all media source src values from source[src] elements in a public webpage or raw HTML

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/css-source-src?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/css-source-src-extractor-9366ddd4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9n6Cz6c1sOCU2uTpZtzSL

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 css-source-src-extractor-9366ddd4 -d '<json body>'
```

Example prompt: Can you extract all the source[src] values from this page — https://example.com/media-gallery — I need to know what media sources are embedded in it?

## When to prefer this

Use this endpoint when you need to programmatically extract source element src attributes from a public webpage or raw HTML content — particularly for media-heavy pages with video or audio sources. Prefer the unpaid POST /v1/sandbox/css-source-src endpoint first for free usage; use this paid endpoint when the sandbox is unavailable or rate-limited. This is SSRF-safe, making it suitable for agent pipelines that need to fetch from public URLs without internal network exposure.

## Known failure modes

- URL is not publicly accessible or returns a non-200 response
- HTML content exceeds 200,000 character limit
- URL string is shorter than 8 characters or longer than 2048 characters
- Page has no source[src] elements, returning an empty list
- SSRF-protected URLs (internal IPs, localhost) are blocked
- Malformed or unparseable HTML may yield incomplete results

## How this service works

Call when an agent needs media source src values via source[src] from a public page or HTML (SSRF-safe). Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/css-source-src first.

## Output

A list of src values found in source[src] elements within the provided page or HTML, enabling the agent to know what media URLs (video, audio, etc.) are embedded. Returns extracted src strings from matching CSS source selectors.

## 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/css-source-src-extractor-9366ddd4/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)