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JSONPlaceholder vs serpstack

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

APIJSONPlaceholderHEALTHY95serpstackHEALTHY93
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms401492
P95 · ms10961442
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limit1000 req/window · 999 remaining · resets 1783509378Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

JSONPlaceholder vs serpstack: common questions

Which is more reliable, JSONPlaceholder or serpstack?

On our scheduled checks, JSONPlaceholder leads on measured uptime — JSONPlaceholder at 100% versus serpstack at 99.02% 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, JSONPlaceholder or serpstack?

JSONPlaceholder has the lower median latency in our checks — JSONPlaceholder responds in 401 ms versus serpstack at 492 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 JSONPlaceholder and serpstack need an API key?

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

Can I call JSONPlaceholder and serpstack from the browser?

Only JSONPlaceholder 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 JSONPlaceholder and serpstack free for commercial use?

JSONPlaceholder 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.