0x is an open protocol designed to facilitate the trustless, low friction exchange of assets on Ethereum. Housed in a monorepo, it encompasses the core 0x protocol smart contracts and a suite of developer tools, each independently published to NPM. Core Solidity packages include @0x/contracts-zero-ex for trade settlements, @0x/contracts-erc20 for ERC20 implementations, and utility libraries like @0x/contracts-test-utils and @0x/contracts-utils for testing and contract functionality. Complementary TypeScript/JavaScript packages offer extensive utilities, such as @0x/protocol-utils for 0x order handling and @0x/contract-wrappers for interactive smart contract operations. Developers collaborating on the 0x protocol are encouraged to explore the official developer portal for a detailed package overview and to contribute through guided contribution guidelines. The project requires Node version 6.x or 8.x and Yarn v1.9.4 for building, testing, and maintaining the repository’s functionality.