Since a few weeks I do have a dynamic electric power tariff with rabot.energy. Unfortunately they only provide their forecast data in their mobile app.
So I reverse engineered the app and figured out how the data is delivered.
I've canned my findings into a tariff implementation for #evcc and created a PR containing my very first lines of go code I've ever written:
https://github.com/evcc-io/evcc/pull/27579