Amazon, naturally, will profit from this, earning about a third of a cent for every play. Developers can use the APIs for free until May 1st, and the first 35,000 plays per month will be free for a limited time. Physical prizes from Amazon will only be available in the US at launch.

Amazon has been testing GameOn with Millenial eSports' Eden Games, nWay, Mindstorm and other developers in games "ranging from casual to core across different genres," the company said. The APIs allow developers to do matchmaking, leaderboards and in-game tournaments. "GameOn saved us months of development and a whole lot of maintenance and logistical overhead in the long run," said Eden Games CMO Pascal Clarysse.

The service will soon be used in competitions for Beach Buggy Racing 2 and a new Doodle Jump title, Amazon said. "Game developers have consistently told us they are looking for ways to increase player engagement and retention," said Amazon Competitive Gaming Director Marja Koopmans. "We built Amazon GameOn to give developers simple, yet powerful, tools to foster community through competitive gameplay."

GameOn is one of Amazon's big announcements for its Amazon Developer Day as part of GDC 2018, which launches today in San Francisco. Lately, Amazon has been heavily promoting -- to developers and players alike -- the idea of competitive gaming that doesn't necessarily rise to the level of eSports.

Many other games and developers like Ubisoft already use Amazon's AWS servers to host multiplayer games and competitions. Amazon has its own studio, Amazon Game Studios and even its own gaming engine, Lumberyard. With GameOn, it's found another way to be involved and further profit from its sprawling cloud infrastructure.

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