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Numverify vs RSQ API

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

APINumverifyHEALTHY93RSQ APIHEALTHY91
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms449783
P95 · ms14881387
AuthapiKeynone
CORSnoyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Numverify vs RSQ API: common questions

Which is more reliable, Numverify or RSQ API?

Both are neck-and-neck — Numverify and RSQ API 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, Numverify or RSQ API?

Numverify has the lower median latency in our checks — Numverify responds in 449 ms versus RSQ API at 783 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 Numverify and RSQ API need an API key?

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

Can I call Numverify and RSQ API from the browser?

Neither sends browser-friendly CORS headers reliably, so call Numverify and RSQ API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Numverify and RSQ API free for commercial use?

Numverify has unclear commercial terms, and RSQ 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.