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Agentshelf Syntexa CSS Atom Autodiscovery
x402
Agentshelf Syntexa CSS Atom Autodiscovery is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Extracts Atom feed autodiscovery hrefs from a public URL or raw HTML by querying link[type='application/atom+xml'] elements, with SSRF protection.
Price / call$0.005
Success—
StatusUnknown
How this service works
Call when an agent needs Atom autodiscovery hrefs via link[type='application/atom+xml'] from a public page or HTML (SSRF-safe). Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/css-atom first.
Output
Returns one or more Atom feed autodiscovery hrefs found in link[type='application/atom+xml'] elements on the given page or HTML, enabling the caller to subscribe to or process the syndication feed.
Example use cases
Discover blog atom feed URL
“I want to subscribe to the Atom feed for https://simonwillison.net — can you find the autodiscovery href for it so I can add it to my reader?”
Validate feed links in raw HTML
“I have the raw HTML of a news homepage and I need to extract all Atom feed autodiscovery hrefs from it — here's the HTML, can you pull those link elements for me?”
Aggregate feeds from multiple sites
“For the site https://feeds.arstechnica.com, can you check what Atom autodiscovery hrefs are declared in its page head so I can build a feed list?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/css-atom?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically discover Atom feed URLs from a public webpage or a block of HTML and want SSRF-safe fetching handled server-side. Prefer this over building your own CSS-selector HTML parser when you need a reliable, sandboxed extraction without standing up infrastructure. If a free sandbox alternative (POST /v1/sandbox/css-atom) is available and sufficient, prefer that first to avoid the $0.005 charge.
Side effects
- No Atom autodiscovery links found on the page (empty result)
- SSRF-blocked URL — request to private/internal IP range rejected
- URL fetch failure — target page unreachable or returns non-200
- HTML too large — exceeds 200,000 character limit
- Malformed URL input below minimum length or above 2048 characters
- Payment failure — insufficient USDC balance for $0.005 charge
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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