> Have an example of a client that DOESN'T require custom code to use an API? Your web browser. Right here. It's talking with HN's API for me to let me post

> Have an example of a client that DOESN'T require custom code to use an API? Your web browser. Right here. It's talking with HN's API for me to let me post this comment. Whenever you have an URL that responds to the browser's requests to let the user do something, that's an API. Maybe a shitty, ad-hoc, poorly designed one, but it's an API. You can even write custom code against if if you want to.