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Currencylayer vs Yahoo Finance Chart

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

APICurrencylayerHEALTHY93Yahoo Finance ChartHEALTHY99
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms511167
P95 · ms967407
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Currencylayer vs Yahoo Finance Chart: common questions

Which is more reliable, Currencylayer or Yahoo Finance Chart?

Both are neck-and-neck — Currencylayer and Yahoo Finance Chart 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, Currencylayer or Yahoo Finance Chart?

Yahoo Finance Chart has the lower median latency in our checks — Currencylayer responds in 511 ms versus Yahoo Finance Chart at 167 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 Currencylayer and Yahoo Finance Chart need an API key?

Yahoo Finance Chart needs no key, while Currencylayer requires a free API key. If you want to start calling without signup, reach for Yahoo Finance Chart first.

Can I call Currencylayer and Yahoo Finance Chart from the browser?

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

Are Currencylayer and Yahoo Finance Chart free for commercial use?

Currencylayer has unclear commercial terms, and Yahoo Finance Chart 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.