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MailCheck.ai vs X (Twitter) API

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

APIMailCheck.aiHEALTHY93X (Twitter) APIHEALTHY95
Uptime · 30d
Uptime · 90d93.1%100%
Uptime · 30d93.3%100%
P50 · ms272392
P95 · ms8421148
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limit5 req/window · 4 remainingUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

MailCheck.ai vs X (Twitter) API: common questions

Which is more reliable, MailCheck.ai or X (Twitter) API?

On our scheduled checks, X (Twitter) API leads on measured uptime — MailCheck.ai at 93.1% versus X (Twitter) API at 100% 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, MailCheck.ai or X (Twitter) API?

MailCheck.ai has the lower median latency in our checks — MailCheck.ai responds in 272 ms versus X (Twitter) API at 392 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 MailCheck.ai and X (Twitter) API need an API key?

MailCheck.ai needs no key, while X (Twitter) API requires a free API key. If you want to start calling without signup, reach for MailCheck.ai first.

Can I call MailCheck.ai and X (Twitter) API from the browser?

Yes — both MailCheck.ai and X (Twitter) API 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 MailCheck.ai and X (Twitter) API free for commercial use?

MailCheck.ai has unclear commercial terms, and X (Twitter) API 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.