Per project, per month, yes. Felt like a mouthful to write, but I'll make that more clear.

Celest's biggest strength with cloud functions is its integration with the Dart language. The CLI generates a strongly-typed API client for you which matches the declaration of your function, and handles all serialization out-of-the-box.

So, if you write a top-level Dart function like this

    // In `celest/functions/my_api.dart`
    Future<String> sayHello(String name) async => 'Hello, name!';

and save the file, you'll get a Flutter client which you can call as

    celest.functions.myApi.sayHello(name: 'Celest'); // Hello, Celest

You can pass just about any Dart class between the frontend and backend, and it will just work. We're going for an RPC-style interface which means your types/parameters can never get out of sync.