Not sure why you're being downvoted. An API is a feature just like any other features your company offers. If 1000 customers/clients ask for feature A and 0 ask

Not sure why you're being downvoted. An API is a feature just like any other features your company offers. If 1000 customers/clients ask for feature A and 0 ask for feature B, it's obvious you shouldn't waste your time on B. If B = "an API", and it doesn't change that it's a waste of time in this scenario.