Axie Infinity is a DApp built on the Ethereum platform that uses ERC721 tokens. The game allows users to buy, sell, trade, fight, and evolve Axies using Ether (ETH), certain Ether wallets, and smart contracts. Although it is possible to write your own code to interact with other Axie owners on the blockchain, the GUI on the game's wed page allows users to participate without any programming knowledge or experience.