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jsDelivr vs Vercel API

Same instrument, two spec sheets — measured, not claimed.

APIjsDelivrNEW—Vercel APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree, no keyFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

jsDelivr vs Vercel API: common questions

Which is more reliable, jsDelivr or Vercel API?

On our scheduled checks, Vercel API leads on measured uptime — jsDelivr at —% versus Vercel API at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do jsDelivr and Vercel API need an API key?

jsDelivr needs no key, while Vercel API requires a free API key. If you want to start calling without signup, reach for jsDelivr first.

Can I call jsDelivr and Vercel API from the browser?

Yes — both jsDelivr and Vercel API send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are jsDelivr and Vercel API free for commercial use?

jsDelivr has unclear commercial terms, and Vercel API has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.