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API Reference - Ideal Postcodes vs IsItWater

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

APIAPI Reference - Ideal PostcodesNEW—IsItWaterNEW—
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 — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

API Reference - Ideal Postcodes vs IsItWater: common questions

Which is more reliable, API Reference - Ideal Postcodes or IsItWater?

On our scheduled checks, IsItWater leads on measured uptime — API Reference - Ideal Postcodes at —% versus IsItWater 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 API Reference - Ideal Postcodes and IsItWater need an API key?

API Reference - Ideal Postcodes needs no key, while IsItWater requires a free API key. If you want to start calling without signup, reach for API Reference - Ideal Postcodes first.

Can I call API Reference - Ideal Postcodes and IsItWater from the browser?

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

Are API Reference - Ideal Postcodes and IsItWater free for commercial use?

API Reference - Ideal Postcodes has unclear commercial terms, and IsItWater 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.