Arts Coins are a game mechanic in Xenoblade Chronicles: Future Connected. They can be exchanged at the Arts Manual Shop for Advanced Art books for Shulk, Melia, Kino, and Nene. Each art book costs one Arts Coin.
Arts Coins can be obtained when defeating any Unique Monster or Fogbeast (excluding any Story Exclusive Fogbeasts) for the first time. Additionally, upon killing the same Fogbeast any additional time, the party has a 10% chance of obtaining an additional Arts Coin.