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SLF vs VA Facilities

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

APISLFNEW—VA FacilitiesNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — static file, no keyFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

SLF vs VA Facilities: common questions

Which is more reliable, SLF or VA Facilities?

On our scheduled checks, VA Facilities leads on measured uptime — SLF at —% versus VA Facilities 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 SLF and VA Facilities need an API key?

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

Can I call SLF and VA Facilities from the browser?

Only SLF is browser-friendly — it returns CORS headers over HTTPS. VA Facilities needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are SLF and VA Facilities free for commercial use?

SLF has unclear commercial terms, and VA Facilities 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.