Axie Infinity, established in 2018, pioneered the play-to-earn model for blockchain players. Axie Infinity is a Pokémon-inspired metaverse where anyone can earn tokens through skilled gameplay and contributions to the ecosystem. Players battle, collect, raise, and build a land-based kingdom for their pets. To play the game, players need to buy NFTs called Axie. In just the last 8 months, Axie Infinity has grown from 30,000 users (April 2021) to almost 2 million users (November 2021).