Smart contract components of 0x protocol

Usage no npm install needed!

<script type="module">
  import 0xContractsExchange from 'https://cdn.skypack.dev/@0x/contracts-exchange';



This package contains the implementation of the Exchange. This contract is responsible for settling trades and is typically the entry point for all transactions that interact with the 0x protocol. Lightweight examples of how external contracts can interact with the Exchange contract can be found in the examples directory. Addresses of the deployed contracts can be found in this 0x guide or the DEPLOYS file within this package.



npm install @0x/contracts-exchange --save

Bug bounty

A bug bounty for the 2.0.0 contracts is ongoing! Instructions can be found here.


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.

For proposals regarding the 0x protocol's smart contract architecture, message format, or additional functionality, go to the 0x Improvement Proposals (ZEIPs) repository and follow the contribution guidelines provided therein.

Please read our contribution guidelines before getting started.

Install Dependencies

If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:

yarn config set workspaces-experimental true

Then install dependencies

yarn install


To build this package and all other monorepo packages that it depends on, run the following from the monorepo root directory:

PKG=@0x/contracts-exchange yarn build

Or continuously rebuild on change:

PKG=@0x/contracts-exchange yarn watch


yarn clean


yarn lint

Run Tests

yarn test

Testing options

Contracts testing options like coverage, profiling, revert traces or backing node choosing - are described here.