shipapis
StarSubmit an APISubmit API

caldays vs X (Twitter) API

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

APIcaldaysNEW—X (Twitter) APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

caldays vs X (Twitter) API: common questions

Which is more reliable, caldays or X (Twitter) API?

On our scheduled checks, X (Twitter) API leads on measured uptime — caldays at —% versus X (Twitter) 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 caldays and X (Twitter) API need an API key?

caldays needs no key, while X (Twitter) API requires a free API key. If you want to start calling without signup, reach for caldays first.

Can I call caldays and X (Twitter) API from the browser?

Yes — both caldays and X (Twitter) 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 caldays and X (Twitter) API free for commercial use?

caldays has unclear commercial terms, and X (Twitter) 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.