Nonsense, curl is a tool for executing a single http request.

Many apis require several requests to get things done. (one to auth, one or more to fecth resource ids, one or more to modify resources, etc).

That would be a series of curl calls with logic applied to the output of each call to curl. An api client just does those things in a single function call. The steps are the same, but in one case the AI has to figure out each curl call and implement the logic, rather than just call the function.