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does-site-use-web-vitals-script
x402
does-site-use-web-vitals-script is a paid API for AI agents from site.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-15).
Checks whether a website's homepage uses the web-vitals JavaScript library by fingerprinting its HTML and response headers, returning a yes/no answer with evidence.
Price / call$0.01
Success—
StatusUnknown
How this service works
Does a website use web-vitals script? Fetches the page (homepage for a bare domain) and matches web-vitals script's fingerprints in the HTML and response headers, returning yes/no with the evidence snippet and the category (performance). 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 web-vitals script was detected on the site's homepage, along with the matching evidence snippet found in the HTML or response headers, and the technology category label (performance).
Example use cases
Competitor performance stack research
“I'm doing competitive research on our top 5 rivals — can you check if acmecorp.com is using the web-vitals script so I know whether they're actively monitoring their page performance?”
Sales prospect technographic enrichment
“We sell performance optimization tools and want to target companies already measuring web vitals. Can you check if techstartup.io has the web-vitals script installed on their site?”
Migration readiness audit
“We're planning a site migration and need to know if our current site, mybrand.com, already has the web-vitals library in place before we switch platforms — can you check?”
Technical details
Endpoint
GEThttps://site.intel.rallylive.ca/site/uses/web-vitals-script?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, low-cost ($0.01) single-domain check for web-vitals script presence as part of sales prospecting, competitive intelligence, or migration planning. Prefer this over bulk endpoints when checking one domain at a time or when you need immediate yes/no results with evidence. Choose this over generic website crawlers when you specifically need technographic data about web-vitals adoption.
Side effects
- Domain is unreachable or returns a non-200 status — result may be inconclusive or an error
- The site serves a JavaScript-rendered SPA where web-vitals is loaded dynamically — static fingerprinting may return false negative
- Minified or obfuscated script names may evade fingerprint matching
- Rate limiting or bot protection on the target site may block the fetch
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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