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Federal Register vs Istanbul (İBB) Open Data

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

APIFederal RegisterNEW—Istanbul (İBB) Open DataNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseUS Government work — public domainUnverified (varies per dataset)
Free tierFree — no key or signup requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Federal Register vs Istanbul (İBB) Open Data: common questions

Which is more reliable, Federal Register or Istanbul (İBB) Open Data?

On our scheduled checks, Istanbul (İBB) Open Data leads on measured uptime — Federal Register at —% versus Istanbul (İBB) Open Data 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 Federal Register and Istanbul (İBB) Open Data need an API key?

Neither needs a paid key — Federal Register is callable with no signup, and Istanbul (İBB) Open Data is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Federal Register and Istanbul (İBB) Open Data from the browser?

Only Federal Register is browser-friendly — it returns CORS headers over HTTPS. Istanbul (İBB) Open Data needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Federal Register and Istanbul (İBB) Open Data free for commercial use?

Federal Register allows commercial use on its free tier, and Istanbul (İBB) Open Data 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.