Awesome

Offer extra content and features for users who stream micro-payments — including premium features, additional content, or digital goods.

Usage

A simple usage example that initializes the monetization to a specific payment pointer:

import 'package:monetization/monetization.dart';

main() {
  var monetization = Monetization('\$pay.tomasarias.me');
}

You can subscribe to Web Monetization events using a Stream:

monetization.onPending.listen((event) {
  // Prepare to serve the monetized content
});

monetization.onStart.listen((event) {
  // Show monetized content
});

monetization.onProgress.listen((event) {
  // Do something on each micro-payment
});

monetization.onStop.listen((event) {
  // Hide monetized content
});

You can also check if a user is paying without subscribing to the streams:

Future<bool> isPaying() async {
  // Prefer custom logic over this
  await Future.delayed(const Duration(seconds: 3));
  return monetization.isPaying;
}

Get information about the monetization

monetization.isMonetized; // Returns if the user supports monetization
monetization.isPaying;    // Returns if the user is streaming payments
monetization.pointer;     // Returns the current payment pointer

Get the revenue from the current session

monetization.getTotal(formatted: false); // 884389
monetization.getTotal(); // 0.000884389
monetization.assetCode;  // 'XRP'
monetization.assetScale; // 9

Enable/disable the monetization dynamically

monetization.enabled;   // true
monetization.disable(); // Stops the monetization
monetization.enable();  // Start the monetization again with the same pointer

Probabilistic revenue sharing

Sometimes you want to share revenue across different people, to do this pass a Map with the payment pointers and weights to the Monetization.probabilistic constructor.

This will use WebMonetization.org's API for sharing the revenue across payment pointers.

final pointers = {
  '\$pay.tomasarias.me/usd': 0.5,
  '\$pay.tomasarias.me/xrp': 0.2,
  '\$pay.tomasarias.me/ars': 0.3
};

var monetization = Monetization.probabilistic(pointers);

This will result on 50% of the revenue going to the first pointer, 20% of the revenue going to the second pointer and 30% of the revenue going to the third one.

For more information on probabilistic revenue sharing, read this article by Ben Sharafian.

Verifying payments (using Vanilla)

Monetization events can be manipulated, so you can't know for sure if a user is really paying. You can add an extra layer of security to your monetized content using Vanilla. To learn how does Vanilla works read this article.

You will need your API credentials, you can get them here.

// Vanilla API Credentials
final clientId = 'Your Client ID';
final clientSecret = 'Your Client Secret';

var monetization = Monetization.vanilla(clientId, clientSecret);

Now you can check if the payment stream is valid in different ways:

// With Vanilla, this will return true if the user is paying and Vanilla generates a proof of payment.
monetization.isPaying;
// With Vanilla, this will return the current payment rate per second, if the monetization is stopped this will be 0.
monetization.getVanillaRate()
// With Vanilla, this will return the total amount received from the current requestId.
monetization.getVanillaTotal();

Features and bugs

Please file feature requests and bugs at the issue tracker.