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SLF vs VA Facilities

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

APISLFHEALTHY98VA FacilitiesHEALTHY80
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms2131386
P95 · ms6683391
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?

Both are neck-and-neck — SLF and VA Facilities each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, SLF or VA Facilities?

SLF has the lower median latency in our checks — SLF responds in 213 ms versus VA Facilities at 1386 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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.