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ImprovMX API vs mail.tm

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

APIImprovMX APINEW—mail.tmNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — temporary mailboxes
Rate limit301 req/window · 300 remaining · resets 1783526520Rate limited (429 on exceed); exact policy per docs.mail.tm
In directory since2026-07-052026-07-05
operationalpartialdownno data

ImprovMX API vs mail.tm: common questions

Which is more reliable, ImprovMX API or mail.tm?

On our scheduled checks, mail.tm leads on measured uptime — ImprovMX API at —% versus mail.tm 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 ImprovMX API and mail.tm need an API key?

mail.tm needs no key, while ImprovMX API requires a free API key. If you want to start calling without signup, reach for mail.tm first.

Can I call ImprovMX API and mail.tm from the browser?

Yes — both ImprovMX API and mail.tm send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are ImprovMX API and mail.tm free for commercial use?

ImprovMX API has unclear commercial terms, and mail.tm 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.