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mailboxlayer vs The Muse

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

APImailboxlayerNEW—The MuseNEW—
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 tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

mailboxlayer vs The Muse: common questions

Which is more reliable, mailboxlayer or The Muse?

On our scheduled checks, The Muse leads on measured uptime — mailboxlayer at —% versus The Muse 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 The Muse need an API key?

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

Can I call mailboxlayer and The Muse from the browser?

Neither sends browser-friendly CORS headers reliably, so call mailboxlayer and The Muse 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 The Muse free for commercial use?

mailboxlayer has unclear commercial terms, and The Muse 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.