To get an overview about the available currencies.
You need to create an API key. The free account is limited to only EUR as a base currency, allows 250 requests per month, and updates every hour.
To enable this sensor, add the following lines to your
# Example configuration.yaml entry sensor: - platform: fixer api_key: YOUR_API_KEY target: CHF
Your API key for Fixer.io.
Details about the API are available in the Fixer.io documentation.