Binding to optimize power consumption in Germany

Hi,
currently I don’t have a flexible contract for electrical energy but still would like to optimize some larger consumption based on availabilty of power in the grid. (So basically an indication based on electrical power exchange rates.)
Is there any binding available (like Awattar or Tibber) which does not require access credentials as being a customer) for the German power “stock exchange”?

I am using the Awattar binding for that. No access credentials required.

Edit: also, check out this: Integration of Energy-Chart Electricity Traffic Light (Stromampel) into OpenHab