Auto top-up / balance warning

Hi, I’ve just started using your platform in production, and will have increasing volume going through the API service. However, so far as I can see there is no option for auto top-up or even for a balance warning, so I will have to manually check in frequently to make sure my balance doesn’t hit zero.

Most AI platforms have an auto top-up feature, or an automatic email balance warning at the very least. Auto top-up would be much appreciated!