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Frankfurter vs Plaid API

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

APIFrankfurterHEALTHY—Plaid APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic data (ECB reference rates)Unverified
Free tierUnlimited — abuse-rate-limited onlyFree tier — API key required
Rate limitUnpublished, generousUnpublished
In directory since2026-05-022026-07-05
operationalpartialdownno data

Frankfurter vs Plaid API: common questions

Which is more reliable, Frankfurter or Plaid API?

On our scheduled checks, Plaid API leads on measured uptime — Frankfurter at —% versus Plaid API 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 Frankfurter and Plaid API need an API key?

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

Can I call Frankfurter and Plaid API from the browser?

Yes — both Frankfurter and Plaid 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 Frankfurter and Plaid API free for commercial use?

Frankfurter allows commercial use on its free tier, and Plaid 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.