Hello RPERTHUISOT , unfortunately there's no API for Indego,
However you can use IFTTT to connect Indego to smart home products not otherwise linked, such as a rain sensor.
And there is already direct connection to Alexa (such as Indego Skill in several languages) and Google Home (such as Indego Action in German now, other languages coming)
Hope it helps, any other updates we'll try to find you with it here!
If Alexa, IFTT and Google Home can control Indego, I assume that you already expose API to them. Why these APIs cannot be used by other companies?