0x is an open protocol that facilitates trustless, low friction exchange of Ethereum-based assets. For more information on how it works, check out the 0x protocol specification.

This repository is a monorepo including the 0x protocol smart contracts and numerous developer tools. Each public sub-package is independently published to NPM.

If you're developing on 0x now or are interested in using 0x infrastructure in the future, please join our developer mailing list for updates.

Packages

Visit our developer portal for a comprehensive list of core & community maintained packages. All packages maintained with this monorepo are listed below.

Python Packages

Package	Version	Description
0x-contract-addresses		A tiny utility library for getting known deployed contract addresses for a particular network
0x-contract-artifacts		0x smart contract compilation artifacts
0x-json-schemas		0x-related JSON schemas
0x-order-utils		A set of utilities for generating, parsing, signing and validating 0x orders
0x-sra-client		A Python client for interacting with servers conforming to the Standard Relayer API specification

Solidity Packages

Package	Version	Description
@0x/contracts-asset-proxy		AssetProxy contracts used within the protocol
@0x/contracts-erc20		Implementations of various ERC20 tokens
@0x/contracts-erc721		Implementations of various ERC721 tokens
@0x/contracts-exchange		The Exchange contract used for settling trades within the protocol
@0x/contracts-exchange-forwarder		A Forwarder contract used to simplify UX for interacting with the protocol
@0x/contracts-exchange-libs		Protocol specific Llbraries used within the Exchange contract
@0x/contracts-extensions		Contracts that interact with and extend the functionality of the core protocol
@0x/contracts-multisig		Various implementations of multisignature wallets, including the AssetProxyOwner contract that has permissions to upgrade the protocol
@0x/contracts-test-utils		Typescript/Javascript shared utilities used for testing contracts
@0x/contracts-utils		Generic libraries and utilities used throughout all of the contracts

Typescript/Javascript Packages

0x-specific packages

Package	Version	Description
0x.js		An aggregate package combining many smaller utility packages for interacting with the 0x protocol
@0x/contract-addresses		A tiny utility library for getting known deployed contract addresses for a particular network.
@0x/contract-wrappers		JS/TS wrappers for interacting with the 0x smart contracts
@0x/order-utils		A set of utilities for generating, parsing, signing and validating 0x orders
@0x/json-schemas		0x-related JSON schemas
@0x/order-watcher		An order watcher daemon that watches for order validity
@0x/migrations		Migration tool for deploying 0x smart contracts on private testnets
@0x/contract-artifacts		0x smart contract compilation artifacts
@0x/abi-gen-wrappers		Low-level 0x smart contract wrappers generated using @0x/abi-gen
@0x/sra-spec		OpenAPI specification for the Standard Relayer API
@0x/connect		An HTTP/WS client for interacting with the Standard Relayer API
@0x/asset-buyer		Convenience package for discovering and buying assets with Ether

Ethereum tooling

Package	Version	Description
@0x/web3-wrapper		An Ethereum JSON RPC client
@0x/sol-compiler		A wrapper around solc-js that adds smart re-compilation, ability to compile an entire project, Solidity version specific compilation, standard input description support and much more.
@0x/sol-coverage		A solidity test coverage tool
@0x/sol-profiler		A solidity gas cost profiler
@0x/sol-trace		A solidity stack trace tool
@0x/sol-resolver		Import resolver for smart contracts dependencies
@dexon-foundation/subproviders		Web3 provider middlewares (e.g. LedgerSubprovider)
@0x/sol-doc		Solidity documentation generator

Utilities

Package	Version	Description
@0x/abi-gen		Tool to generate TS wrappers from smart contract ABIs
@0x/tslint-config		Custom TSLint rules used by the 0x core team
@0x/types		Shared type declarations
@dexon-foundation/typescript-typings		Repository of types for external packages
@0x/utils		Shared utilities
@0x/react-docs		React documentation component for rendering TypeDoc & sol-doc generated JSON
@0x/react-shared		0x shared react components
@0x/assert		Type and schema assertions used by our packages
@0x/base-contract		BaseContract used by auto-generated abi-gen wrapper contracts
@0x/dev-utils		Dev utils to be shared across 0x packages
@0x/fill-scenarios		0x order fill scenario generator

Private Packages

Usage

Node version >= 6.12 is required.

Most of the packages require additional typings for external dependencies. You can include those by prepending the @dexon-foundation/typescript-typings package to your typeRoots config.

"typeRoots": ["node_modules/@dexon-foundation/typescript-typings/types", "node_modules/@types"],

Contributing

We strongly recommend that the community help us make improvements and determine the future direction of the protocol. To report bugs within this package, please create an issue in this repository.

Read our contribution guidelines.

Install dependencies

Make sure you are using Yarn v1.9.4. To install using brew:

brew install yarn@1.9.4

Then install dependencies

yarn install

Build

To build all packages:

yarn build

To build a specific package:

PKG=@0x/web3-wrapper yarn build

To build all contracts packages:

yarn build:contracts

Watch

To re-build all packages on change:

yarn watch

To watch a specific package and all it's dependent packages:

PKG=[NPM_PACKAGE_NAME] yarn watch

e.g
PKG=@0x/web3-wrapper yarn watch

Clean

Clean all packages:

yarn clean

Clean a specific package

PKG=0x.js yarn clean

Rebuild

To re-build (clean & build) all packages:

yarn rebuild

To re-build (clean & build) a specific package & it's deps:

PKG=0x.js yarn rebuild

Lint

Lint all packages:

yarn lint

Lint a specific package:

PKG=0x.js yarn lint

Run Tests

Run all tests:

yarn test

Run a specific package's test:

PKG=@0x/web3-wrapper yarn test

Run all contracts packages tests:

yarn test:contracts