Composable Token

A composable token is a crypto token designed to be combined with other tokens or applications. In its narrow sense, it describes a non-fungible token that can own other tokens, so that a whole bundle moves as one item. The ERC-998 proposal, published for Ethereum in 2018, defined such "composables": a game character NFT, for example, could hold NFTs for its weapons and clothes and fungible tokens for its in-game gold, all transferred together when the character is sold. Similar ideas appear in later work on token-bound accounts. In a looser sense, any token built to a common token standard such as ERC-20, ERC-721 or ERC-1155 is composable, because other protocols can accept it without custom work. Also see Composability.