Find Public APIsA building block for your next idea.
Add a reference currency converter to a travel budget or expense tracker.
Know before you build
Reference rates are not live trading quotes. The v2 API supports provider filtering; cache results rather than repeatedly requesting the same rates.
Check current provider documentation ↗Your first request
Start with this documented example. Replace credential placeholders with your own test credentials. Browser execution depends on the provider’s CORS policy.
curl --request GET 'https://api.frankfurter.dev/v2/rates?base=EUR"es=USD'Practical questions
What can I build with Frankfurter?+
Add a reference currency converter to a travel budget or expense tracker.
Does Frankfurter need authentication?+
The reviewed example is listed as “No key”. Reference rates are not live trading quotes. The v2 API supports provider filtering; cache results rather than repeatedly requesting the same rates.
Can I call Frankfurter from a browser?+
Browser access depends on the provider’s CORS policy for your origin, method, and headers. The playground makes a direct request and cannot bypass those restrictions.
Sources & confidence
Provider documentation was reviewed on 16 September 2026. This is not a live availability test or an endorsement.
Source catalogs can become outdated. Read our review and attribution policy. Plain-text guide ↗