Hello,
I have just built a free bitcoin app and which also gives more them 8 currency's free every 5 min.
FreeBits supports 8 different digital currencies right now.
1.Bitcoin 2.Litecoin 3.Dogecoin 4.Peercoin 5.Ethereum 6.Dashcoin 7.Primecoin 8.Monero
https://play.google.com/store/apps/details?id=com.happygames.freebitshttps://huntbits.com/gamesCheck it and and write a review.
looking for your comments to improve it