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mailboxlayer vs Ntropy Transaction API v1

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

APImailboxlayerNEW—Ntropy Transaction API v1NEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

mailboxlayer vs Ntropy Transaction API v1: common questions

Which is more reliable, mailboxlayer or Ntropy Transaction API v1?

On our scheduled checks, Ntropy Transaction API v1 leads on measured uptime — mailboxlayer at —% versus Ntropy Transaction API v1 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 Ntropy Transaction API v1 need an API key?

Ntropy Transaction API v1 needs no key, while mailboxlayer requires a free API key. If you want to start calling without signup, reach for Ntropy Transaction API v1 first.

Can I call mailboxlayer and Ntropy Transaction API v1 from the browser?

Neither sends browser-friendly CORS headers reliably, so call mailboxlayer and Ntropy Transaction API v1 from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are mailboxlayer and Ntropy Transaction API v1 free for commercial use?

mailboxlayer has unclear commercial terms, and Ntropy Transaction API v1 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.