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FinSignals API vs mailboxlayer

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

APIFinSignals APIHEALTHY96mailboxlayerHEALTHY96
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms312316
P95 · ms14192634
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

FinSignals API vs mailboxlayer: common questions

Which is more reliable, FinSignals API or mailboxlayer?

Both are neck-and-neck — FinSignals API and mailboxlayer each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, FinSignals API or mailboxlayer?

FinSignals API has the lower median latency in our checks — FinSignals API responds in 312 ms versus mailboxlayer at 316 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 FinSignals API and mailboxlayer need an API key?

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

Can I call FinSignals API and mailboxlayer from the browser?

Only FinSignals API is browser-friendly — it returns CORS headers over HTTPS. mailboxlayer needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are FinSignals API and mailboxlayer free for commercial use?

FinSignals API has unclear commercial terms, and mailboxlayer 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.