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Abstract API vs Numverify

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

APIAbstract APIHEALTHY89NumverifyHEALTHY93
Uptime · 30d
Uptime · 90d99.02%100%
Uptime · 30d98.3%100%
P50 · ms700449
P95 · ms16561488
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Abstract API vs Numverify: common questions

Which is more reliable, Abstract API or Numverify?

On our scheduled checks, Numverify leads on measured uptime — Abstract API at 99.02% versus Numverify at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Abstract API or Numverify?

Numverify has the lower median latency in our checks — Abstract API responds in 700 ms versus Numverify at 449 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 Abstract API and Numverify need an API key?

Both ask you to authenticate — Abstract API uses an API key and Numverify uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call Abstract API and Numverify from the browser?

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

Are Abstract API and Numverify free for commercial use?

Abstract API has unclear commercial terms, and Numverify 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.