Frankfurter is an open-source API for current and historical foreign exchange rates published by the European Central Bank.

Powerful API

Fetch individual dates or download them in bulk as time series data. Historical rates go back to 1999.

Works client-side

Use in your web or mobile app. Frankfurter does not cap usage or require an API key.

Deploy anywhere

Query our free hosted service or self-host with Docker or Heroku.