How to get the cheapest fuel station

Hey,
is it possible to get the cheapest fuel station in my location (~5km) and show me the price and the name of the fuel station for E5 and Diesel. And how to i procede atm im useing Tankerkoenig api.

If you understand German this guy has a decent video for your question:

Yes, i know this video but i dont want a list of every fuel station i only want to list the cheapest one. How do i do this?