And a list is not copyrightable.
Think to the Yellow Pages for examples. No Copyright on name, address and numbers (hopefully) , because no specific form or shape to these writings.
The case is to define if design an API is more than listing URLs. I don't think so, and the Judge Alsup of Oracle vs Google who was developer too, said the same thing.
But API providers will try to not accept this. Do you remeber Twitter's message to developers
IFTTT, Zapier, Webshell.io, Webscript.io, Elasctic.io, Apiary.io, Opalang.org, Rules.io etc...we have something to bring to email@example.com