Coins are items in Mega Run that the player can collect to add up the score and buy items. Unlike in Mega Run's predecessor, Mega Jump, coins are optional and do not serve any vital purpose in beating a level.
You can buy them in the Store for...
4000 Coins - $2 - 12 CNY
11000 Coins - $5 - 30 CNY
48,000 Coins - $20 - 128 CNY
140000 Coins - $50 - 328 CNY