# AgentShelf CSS Audio Source Extractor

> AgentShelf CSS Audio Source Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Extracts audio source URLs from the audio[src] attribute in a public webpage or raw HTML, with SSRF protection.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/css-audio-src?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-css-audio-source-extractor-f1ed56c3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hI5Vwn8KkKuwWHhW9spsY

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-audio-source-extractor-f1ed56c3 -d '<json body>'
```

Example prompt: Can you pull out the audio source URL from the audio element on this page: https://example.com/podcast-episode? I need the actual audio file link that the browser would play.

## When to prefer this

Choose this endpoint when you need to programmatically extract the audio[src] attribute from a webpage or HTML fragment, especially in agentic pipelines where SSRF safety is required. Prefer the free sandbox endpoint POST /v1/sandbox/css-audio-src first if available. Use this paid endpoint when the sandbox is unavailable or rate-limited.

## Known failure modes

- URL is unreachable or returns a non-200 status — extraction fails
- SSRF-blocked URL (internal/private IP range) — request rejected for safety
- HTML exceeds 200,000 character limit — input truncated or rejected
- No audio[src] attribute present in the page or HTML — empty/null result returned
- Malformed URL (shorter than 8 characters) — validation error

## How this service works

Call when an agent needs audio sources via audio[src] from a public page or HTML (SSRF-safe). Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/css-audio-src first.

## Output

Returns the value of the audio[src] attribute found within the provided URL or HTML content — typically an absolute or relative URL pointing to an audio file (e.g. MP3, OGG, WAV). If no audio source is found, a null or empty result is returned.

## 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-audio-source-extractor-f1ed56c3/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)