Tankerkoenig
The tankerkoenig platform allows you to monitor the fuel prices with tankerkoenig.de
Configuration
To add the Tankerkoenig integration to your Home Assistant instance, use this My button:
        Manual configuration steps
      
      
      
      
    
    If the above My button doesn’t work, you can also perform the following steps manually:
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Browse to your Home Assistant instance.
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In the bottom right corner, select the
Add Integration button.  - 
From the list, select Tankerkoenig.
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Follow the instructions on screen to complete the setup.
 
The Terms & Conditions of tankerkoenig.de specify that the API is not meant for massive data fetching, but it does not explicitly mention a limit. Having a maximum of 10 monitored fuel stations is recommended, and a warning will be issued otherwise.