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Global Shark Attack API vs serpstack

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

APIGlobal Shark Attack APINEW—serpstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Global Shark Attack API vs serpstack: common questions

Which is more reliable, Global Shark Attack API or serpstack?

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

Do Global Shark Attack API and serpstack need an API key?

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

Can I call Global Shark Attack API and serpstack from the browser?

Only Global Shark Attack 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 Global Shark Attack API and serpstack free for commercial use?

Global Shark Attack 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.