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does-site-use-clerk
x402
does-site-use-clerk is a paid API for AI agents from site.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).
Detects whether a given website uses the Clerk authentication platform by fingerprinting its homepage HTML and response headers
Price / call$0.01
Success—
StatusUnknown
How this service works
Does a website use Clerk? Fetches the page (homepage for a bare domain) and matches Clerk's fingerprints in the HTML and response headers, returning yes/no with the evidence snippet and the category (auth). Technographics for sales, competitor research and migration planning, one technology per call. $0.01 per check.
Output
Returns a yes/no boolean indicating whether the site uses Clerk, along with an evidence snippet (the matching HTML or header fragment that triggered the fingerprint) and the technology category label (auth). Priced at $0.01 per call.
Example use cases
Sales prospecting for Clerk competitors
“I'm building a list of companies to pitch our auth migration tool to — can you check if notion.so uses Clerk?”
Competitor tech stack research
“I want to know if my competitor linear.app is running Clerk for their login system — can you detect that from their homepage?”
Migration planning for existing Clerk users
“We're building a list of Clerk customers to target for our identity platform migration service — can you tell me if vercel.com is currently using Clerk?”
Technical details
Endpoint
GEThttps://site.intel.rallylive.ca/site/uses/clerk?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, cheap, single-domain technographic check specifically for Clerk authentication. It is purpose-built for sales prospecting, competitor stack analysis, and migration targeting workflows where you need yes/no Clerk detection with evidence. Use bulk sibling endpoints when checking multiple domains. Prefer this over generic web scraping when the sole question is 'does this site use Clerk?'
Side effects
- Domain is unreachable or returns a non-200 response — result may be indeterminate
- Clerk fingerprints are obfuscated or loaded via deferred JavaScript — may return false negative
- Bare domain redirects to a subdomain that uses Clerk — may miss detection if homepage is not the auth entry point
- Rate limiting or bot blocking on target domain — fetch may fail
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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