Smart contract components of 0x protocol

Usage no npm install needed!

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



This package contains the implementations of all of the AssetProxy contracts available within the 0x protocol. These contracts are responsible for decoding the assetData sent to them and performing the actual transfer of assets. Addresses of the deployed contracts can be found in this 0x guide or the DEPLOYS file within this package.



npm install @0x/contracts-asset-proxy --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-asset-proxy yarn build

Or continuously rebuild on change:

PKG=@0x/contracts-asset-proxy 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.