Currently the energy price can only contain 2 digits. At least in Germany it is standard, to have energy prices like 0,2551 Eur/kWh. Maybe this can be developed for a future version.
Setting the price by API, you can use more digits.... just the Web-App and the APP allow only two digits. .... another Bug ist, if you change the price in the App it deletes the "costPerKwhExcludeVat" value and sets it to 0.
Both the mobile app and the web app, use the API to update the site's charging price. So yes you can update the price to have more than 2 decimals (at least with the app you can), but yes we do display it with just 2 decimals at the moment.
When you update the charging price for a site using the app, we only send the costPerKWh, so the fact that its setting the costPerKWhExcludeVat to 0, sounds like a bug in the API.
Example of what the payload looks like when the app changes the price: