Questions for apis - switching between Stock exhanges

Greetings to all…

Very green to this world and trying to understand it

My first question : The api from ALPACA which I am doing testing on - is there an opton to trade on other stock exchanges or is the NYSE the only one?
I am using the api for paper trading maybe this is why this is not possiable?

Thanks for a very nice tune and all great answers:-)