You can now use Amazon Coins, the online retailers virtual currency, to purchase apps, games, and in-app content on Android devices. Unsurprisingly, those purchases must all be made within Amazons standalone Appstore; Amazon first unveiled Coins last year and gave every Kindle Fire owner $5 in an attempt to boost the currency out of the gate. Nevertheless, and without offering any hard numbers, Amazon says its been amazed by the number of customers using Coins, as well as how many Coins they’re spending on apps and games. Expanding beyond Kindle Fire devices is a big step as Amazon looks to push Coins along — both to consumers and more developers.