Frankfurter is a free and open-source currency data API that tracks reference exchange rates published by the European Central Bank.
api.frankfurter.app
hosts a public instance of the API.
Get the latest exchange rates.
https://api.frankfurter.app/latest
Get rates for a past date.
https://api.frankfurter.app/2000-01-03
Get rates for a period.
https://api.frankfurter.app/2010-01-01..2010-01-31
For more examples, read the docs.
You can self-host Frankfurter with Docker.
docker run -d -p 8080:8080 \
-e "DATABASE_URL=<postgres_url>" \
--name frankfurter hakanensari/frankfurter
Frankfurter was known as Fixer between 2012 and 2018. After selling the original domain, I relaunched under this name.