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mail.tm vs Ntropy Transaction API v1

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

APImail.tmHEALTHY82Ntropy Transaction API v1HEALTHY79
Uptime · 30d
Uptime · 90d84.3%98.0%
Uptime · 30d75.0%96.7%
P50 · ms7091223
P95 · ms23514484
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — temporary mailboxesFree — limits not published
Rate limitRate limited (429 on exceed); exact policy per docs.mail.tmUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

mail.tm vs Ntropy Transaction API v1: common questions

Which is more reliable, mail.tm or Ntropy Transaction API v1?

On our scheduled checks, Ntropy Transaction API v1 leads on measured uptime — mail.tm at 84.3% versus Ntropy Transaction API v1 at 98.0% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, mail.tm or Ntropy Transaction API v1?

mail.tm has the lower median latency in our checks — mail.tm responds in 709 ms versus Ntropy Transaction API v1 at 1223 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do mail.tm and Ntropy Transaction API v1 need an API key?

Neither needs a paid key — mail.tm is callable with no signup, and Ntropy Transaction API v1 is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call mail.tm and Ntropy Transaction API v1 from the browser?

Neither sends browser-friendly CORS headers reliably, so call mail.tm 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 mail.tm and Ntropy Transaction API v1 free for commercial use?

mail.tm 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.