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apilayer aviationstack vs Transport for Spain

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

APIapilayer aviationstackNEW—Transport for SpainNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — no key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

apilayer aviationstack vs Transport for Spain: common questions

Which is more reliable, apilayer aviationstack or Transport for Spain?

On our scheduled checks, Transport for Spain leads on measured uptime — apilayer aviationstack at —% versus Transport for Spain 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 apilayer aviationstack and Transport for Spain need an API key?

Transport for Spain needs no key, while apilayer aviationstack requires a free API key. If you want to start calling without signup, reach for Transport for Spain first.

Can I call apilayer aviationstack and Transport for Spain from the browser?

Neither sends browser-friendly CORS headers reliably, so call apilayer aviationstack and Transport for Spain from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are apilayer aviationstack and Transport for Spain free for commercial use?

apilayer aviationstack has unclear commercial terms, and Transport for Spain 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.