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Poptin API vs serpstack

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

APIPoptin APIREACHABLE100serpstackHEALTHY96
Uptime · 30d
Uptime · 90d100%99.44%
Uptime · 30d100%100%
P50 · ms698288
P95 · ms17051188
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified
Free tierFree tier — key may be required
Rate limit120 req/window · 119 remainingUnpublished
In directory since2026-10-042026-07-05
operationalpartialdownno data

Poptin API vs serpstack: common questions

Which is more reliable, Poptin API or serpstack?

On our scheduled checks, Poptin API leads on measured uptime — Poptin API at 100% versus serpstack at 99.44% 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, Poptin API or serpstack?

serpstack has the lower median latency in our checks — Poptin API responds in 698 ms versus serpstack at 288 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 Poptin API and serpstack need an API key?

Both ask you to authenticate — Poptin API uses an API key and serpstack 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 Poptin API and serpstack from the browser?

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

Are Poptin API and serpstack free for commercial use?

Poptin API has unclear commercial terms, and serpstack 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.