Amazon announces Amazon Coins in May 2013: stakes and opportunity.

It is henceforth official, as from May, Amazon Coins , a new virtual currency, will be available to Kindle Fire users. This means they can be used to pay for apps and for most in-app purchases.

Regarding developers ,if your app runs on the Kindle Fire, it is eligible for Amazon Coins with no further work on your part. However if it runs on another Android device and is

already in the Amazon Appstore for Android, you'll need to review the Kindle Fire Best Practices and then re-submit your app with the appropriate Kindle Fire devices checked in the Device Support section of the submission form.