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mailboxlayer vs UK Bank Holidays

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

APImailboxlayerNEW—UK Bank HolidaysNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedOpen Government Licence v3.0
Free tierFree tier — key may be requiredFree, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

mailboxlayer vs UK Bank Holidays: common questions

Which is more reliable, mailboxlayer or UK Bank Holidays?

On our scheduled checks, UK Bank Holidays leads on measured uptime — mailboxlayer at —% versus UK Bank Holidays 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 mailboxlayer and UK Bank Holidays need an API key?

UK Bank Holidays needs no key, while mailboxlayer requires a free API key. If you want to start calling without signup, reach for UK Bank Holidays first.

Can I call mailboxlayer and UK Bank Holidays from the browser?

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

Are mailboxlayer and UK Bank Holidays free for commercial use?

mailboxlayer has unclear commercial terms, and UK Bank Holidays allows commercial use on its free tier. 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.