Honestly, none in particular at the moment and yet also any that's needed. I just see a situation where if I did need to work with two currencies, having an API

Honestly, none in particular at the moment and yet also any that's needed. I just see a situation where if I did need to work with two currencies, having an API for one and then building the infrastructure in house for the other seems silly, especially since most alt coins are literally clones of each other.