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AgentShelf XPath Caption Extractor
x402
AgentShelf XPath Caption 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 caption text from a public webpage or raw HTML using XPath targeting of caption elements, with SSRF protection.
Price / call$0.002
Success—
StatusUnknown
How this service works
Call when an agent needs text of //caption via //caption from a public page or HTML (SSRF-safe). Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/xpath-caption first.
Output
Returns the extracted caption text from the specified public webpage URL or provided HTML, targeted via XPath on caption-type elements. The response contains the plain text content of the matched caption node(s).
Example use cases
Extract image captions from news articles
“Go to https://bbc.com/news/world-12345678 and pull out the caption text that appears under the main image on that page.”
Parse captions from raw HTML snippet
“I have some HTML from a product page — can you extract the caption text from it? Here's the HTML: <figure><figcaption>Award-winning design 2024</figcaption></figure>”
Scrape figure captions for a dataset
“I need the caption text from this public gallery page at https://museum.example.org/collection/item/42 — grab whatever is in the caption or figcaption element.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/xpath-caption?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to extract caption text specifically (figcaption, caption elements) from a public webpage or raw HTML and want SSRF-safe fetching built in. Prefer the free sandbox endpoint /v1/sandbox/xpath-caption first if available to avoid the $0.002 USDC cost. Choose this over general HTML scrapers when you specifically need XPath-targeted caption extraction without running your own browser or parser.
Side effects
- No caption element found on the page — returns empty or null result
- SSRF-blocked URL (private IP ranges, localhost) — request rejected for security
- URL is not publicly accessible or returns non-200 status — fetch failure
- HTML input exceeds 200,000 character limit — payload too large error
- Malformed HTML that cannot be parsed by XPath — parse error
- URL string shorter than 8 characters or longer than 2048 characters — validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public page to fetch. The selector or profile is fixed by the SKU. Provide url or html. |
| html | string | HTML to extract from locally. Provide html or url. When both are set, html is used. |
Tags
x402
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