A bank could easily provide such an API without any need for a new coin.
Does that API support sending $50 to my unbanked aunt in Mexico?
I'm curious though, what would she do with that crypto once she had it?
Presumably she'd need to exchange it for cash since retail acceptance of crypto is pretty low, and the local exchange place that takes WhateverStablecoin and hands out cash is going to take some commission. And at that point it seems like we've just reinvented Western Union or Moneygram.
In your view is the advantage of the hypothetical stablecoin way of doing this that it exists outside of the money-transfer provider ecosystem until its actually exchanged?