Hi @Nicholai_Ronningen, if you look through historical forum posts you will find other people requesting for this feature as well.
Here is the response from Keap back in May 2018: API access for deals pipeline? - #12 by Nicholas_Trecina
Unfortunately, the API development has been stagnant over the years, with no sign of this appearing.
If you want to interact with the Deals via the API, I recommended that you switch to a different CRM that supports it.