Amazon today announced a new program to bring revenue to developers of Alexa skills based on how much engagement their voice app is able to generate among users of Alexa-enabled devices. From a report: Amazon appears to be the first of the major tech companies with AI assistants and third-party integrations -- like Google, Samsung, Apple, and Microsoft -- with a program to compensate developers based on engagement created by their voice app. Metrics used to measure engagement of an Alexa skill include minutes of usage, new customers, customer ratings, and return visitors, an Amazon spokesperson told VentureBeat. Developers of Alexa skills in the U.S., U.K., and Germany are eligible to join. Developers with a skill active in all three countries will receive separate payments based on engagement in each country.