Nowadays, most web services offers some form of API-keys to access and update data programmatically. But there's usually a little catch: API-keys are full access and thus only usable from server to server. Some services has started to offer OAuth-access, but that involves some sort of authentication first.
In addition to a full-access API-key, restdb.io lets you add multiple keys with CORS-support. CORS enables javascript-calls directly from a web-page to a server other than the server hosting the page.