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does-site-use-polyfill
x402
does-site-use-polyfill is a paid API for AI agents from site.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).
Checks whether a given website uses polyfill.io by fetching its homepage and matching polyfill.io fingerprints in HTML and response headers.
Price / call$0.01
Success—
StatusUnknown
How this service works
Does a website use polyfill.io? Fetches the page (homepage for a bare domain) and matches polyfill.io's fingerprints in the HTML and response headers, returning yes/no with the evidence snippet and the category (library). Technographics for sales, competitor research and migration planning, one technology per call. $0.01 per check.
Output
Returns a yes/no answer indicating whether polyfill.io was detected on the site, along with the evidence snippet (the matching HTML or header content that triggered the fingerprint) and the technology category label ('library').
Example use cases
Sales prospecting for migration tool
“I'm selling a polyfill migration service — can you check if shopify.com still loads polyfill.io so I know whether to pitch them?”
Competitor technology audit
“Run a quick tech check on our competitor's site, widget.co — do they use polyfill.io anywhere on their homepage?”
Pre-migration dependency audit
“Before we start the migration project for client site legacy-portal.net, can you confirm whether they're currently using polyfill.io so we can plan the work accordingly?”
Technical details
Endpoint
GEThttps://site.intel.rallylive.ca/site/uses/polyfill?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, low-cost ($0.01) single-technology check for polyfill.io specifically on a given domain. It is ideal for sales enrichment pipelines, technographic profiling, or pre-migration audits where you only need to know about polyfill.io. For multi-technology scans, combine with sibling endpoints for Angular, Firebase, Moment.js, etc. on the same platform.
Side effects
- Site is unreachable or returns a non-200 status — check may fail or return inconclusive
- Homepage redirects to a login wall, blocking HTML analysis
- Polyfill.io loaded asynchronously or conditionally may not appear on the static homepage fetch
- Rate limiting or bot detection on the target domain may prevent fetching
- False negatives if polyfill.io is loaded via a proxy or custom CDN alias that obscures the fingerprint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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