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PapaCasper Structured Data Extract
x402
PapaCasper Structured Data Extract is a paid API for AI agents from papacasper.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Extracts structured data from a webpage using CSS selectors, returning matched text content or HTML attributes for each named field
Price / call$0.01
Success—
StatusUnknown
How this service works
A hosted MCP server exposing utility tools any AI agent can call over HTTP — page-to-markdown, SEO audits, robots/sitemap checks, and more.
Output
A JSON object where each key corresponds to a named field from the selectors map, and each value is an array of whitespace-normalized text strings (or attribute values if attr is specified) matched in document order from the target page.
Example use cases
E-commerce price monitoring
“Pull the current price and sale badge from https://www.bestbuy.com/site/apple-macbook-pro/123456.p — use '.priceView-customer-price span' for price and '.sale-flag' for any promotional label.”
News article headline scraping
“Extract the main headline and author name from https://www.nytimes.com/2024/01/15/tech/ai-article.html using 'h1' for the headline and '.byline-author' for the author.”
Bulk link harvesting from a page
“Get all the href attributes from every anchor tag on https://docs.python.org/3/library/index.html — use 'a' as the selector and set the attribute to 'href' so I get all the link URLs.”
Technical details
Endpoint
POSThttps://papacasper.com/mcp/pay/structured_data_extractWhen to prefer
Choose this endpoint when you need to extract specific named fields from a webpage using CSS selectors, especially when you know the page structure and want structured key-value output rather than full markdown conversion. It is ideal for scraping product pages, news articles, or any page with predictable HTML structure. Prefer alternatives like the page-to-markdown endpoint when you need the full readable content of a page rather than targeted field extraction.
Side effects
- URL is unreachable or returns non-200 status — endpoint may return an error or empty result
- CSS selector matches no elements — returns empty array for that field
- Invalid or malformed URL — returns validation error
- Page requires JavaScript rendering — static HTML-only extraction may miss dynamically loaded content
- Rate limiting or bot protection on target URL — may return empty or blocked response
- Payment failure via x402 protocol — request is rejected before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlrequired | string | The URL to extract from |
| attr | string | Optional HTML attribute to extract instead of text content (e.g. 'href', 'src', 'content'). Applies to all selector fields in this call. |
| selectors | object | Optional map of field name -> CSS selector (e.g. { price: '.product-price', headline: 'h1' }). Each field returns an array of matched, whitespace-normalized text values in document order. |
Output
Schema · Response
{
"type": "object"
}Tags
x402
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