From all the banks I've tried over the years I always check for this feature, sometimes asked and never got what I wanted. "No the API is only available for our 100k a month or more users" is the closest I got.
However when I really wanted a solution i build a small service that receives the confirmation SMS most banks offers and pushes my balance in a small API.
However when I really wanted a solution i build a small service that receives the confirmation SMS most banks offers and pushes my balance in a small API.