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Arbitrum Developer Quickstart

Arbitrum is a suite of Ethereum scaling solutions that enables high-throughput, low cost smart contracts while remaining trustlessly secure. Arbitrum has three modes: AnyTrust Channels, AnyTrust Sidechains, and Arbitrum Rollup. The following documentation describes how to use Arbitrum Rollup, which is currently live on testnet. Whether you're a developer that just wants to start building or you're curious into digging deeper into the internals of Arbitrum and how it works, this site is the right place for you.

How does Arbitrum work?

If you're looking to discover how Arbitrum works, the best place to begin is by the Rollups basics section, which gives a high level overview of Arbitrum's internals. From there, you can jump into more detailed explainers on various components of the system.

How Can I Start Building

If you want to get started using Arbitrum with no setup required, check out our public testnet running on top of Rinkeby.

How Can I Develop Locally

The very first step to start building with Arbitrum is installing Arbitrum and its dependencies. Next, you'll need to deploy an Arbitrum chain on an L1 blockchain. You can follow the local testnet guide for a quickstart walkthrough deployment of an Arbitrum Rollup chain on the local testnet.

Note that Arbitrum chains support dynamic launching of contracts, so you don't need to setup an Arbitrum chain for each application you build, and indeed you may deploy your contracts on a testnet chain which you did not launch. The benefits of having multiple applications on the same Arbitrum Rollup chain is that they'll be able to interact synchronously, just as they would if they were launched directly on Ethereum.

Once you have deployed Arbitrum, you can build and run the demo app or deploy your own contracts.

Want to learn more? Check out the open source code. Join the team on Discord.

Setup Local Geth and Rollup Blockchain

See Local Blockchain Setup.

Hello, Arbitrum

Now you'll deploy and run a demo dApp on Arbitrum. The dApp is based on a simple Pet Shop dApp that is used in a Truffle tutorial.

First clone the pet-shop demo dApp and install dependencies:

git clone https://github.com/OffchainLabs/demo-dapp-pet-shop
cd demo-dapp-pet-shop
yarn

Deployment

Deploy contracts to Arbitrum :

truffle migrate --network arbitrum

Use the dApp

  1. Install Metamask

    Once Metamask is installed, open it and select Import Account and enter one of the following pre-funded private keys

    0x979f020f6f6f71577c09db93ba944c89945f10fade64cfc7eb26137d5816fb76
0xd26a199ae5b6bed1992439d1840f7cb400d0a55a0c9f796fa67d7c571fbb180e
0xaf5c2984cb1e2f668ae3fd5bbfe0471f68417efd012493538dcd42692299155b
0x9af1e691e3db692cc9cad4e87b6490e099eb291e3b434a0d3f014dfd2bb747cc
0x27e926925fb5903ee038c894d9880f74d3dd6518e23ab5e5651de93327c7dffa
0xe4b33c0bb790b88f2463facaf86ae7c17cbdab41187e69ddde8cc1c1fda7c9ab

  1. Select local arbitrum network in Metamask

    • Go back to Metamask or click the extension icon
    • Select Main Ethereum Network top right hand side
    • Choose Custom RPC
    • Enter Local Arbitrum as the network name
    • Enter http://127.0.0.1:8547 as the RPC url
    • Press the save button
    • Metamask should now have an Local Arbitrum account holding ETH

  2. Launch the front-end

    yarn start

    The browser will open to localhost:8080

    In the popup window that appears, select Connect

  3. Adopt some pets

    The pet shop dApp should now be running in your browser. Choose a pet or two and click the adopt button to adopt your new animal friend(s).

Election Dapp

If you want to try another dApp run, deploy the solidity contracts and launch the frontend

git clone https://github.com/OffchainLabs/demo-dapp-election
cd demo-dapp-election
yarn
truffle migrate --network arbitrum
yarn start

More Demos

For more demos, see our demos mono-repo.

User Quickstart →