Amazon's new Underground service puts a new spin on app store monetisation.

From a player's point of view, access is free, with Amazon paying app and game developers on a per-minute rate for consumers' access to their content. 

The rate is $0.002 per minute.

Amazon has been offering paid apps for free on a daily basis from the Amazon Appstore for years; an effort to incentivise new users to install the forked Android store on their device.

The situation with Amazon Underground ramps up that philosophy.

Flipside

Of course, how this new model works in Amazon's favour, other than as a UA exercise, is currently unknown.

Equally, it's not clear whether developers will be better off with a system that requires 500 minutes of play to generate $1 in revenue compared to the now-well tested F2P model. 

Our sister site Pocket Gamer has a tutorial of how consumers can get hold of Amazon Underground, and there's more information for developers over on the Amazon Undeground site.