Yes you are right.
The definition of the sensor:
- platform: rest
resource_template: "https://api.awattar.at/v1/marketdata" # alle verfügbaren zukünftigen Daten
name: awattar_full
json_attributes:
- data
scan_interval: 10800 #jede 3. Stunde neue Daten holen
value_template: "{{ (value_json.data[0]) }}"
As far as i know does tibber also provide data but not via rest api. Its a GraphQL subscription or a websocket subscription and you need an personal authentication token. I dont know how this works, maybe someone figured it out already, or you dig through the documentation of tibber and HA. My Code is also just a bunch of copy and paste, so i can not give deeper support on this topic.
But as a dirty workaround for testing purposes you can also use the awattar.de api. The price is the same, you just have to add Taxes and Netznutzungsgebühren depending on the area you live and depending on which price you want as I did it in my previous post with the taxes *1.20 :