Public Testnet Guide

In order to make it easy for people to get started using Arbitrum Rollup, we've launched our own hosted Arbitrum Rollup chain hosted on the Kovan testnet.

For a general introduction to the Arbitrum Testnet, see our announcement.

For a convenient landing page for all your testnet needs, see our website.

Connection Information

Hosted Aggregator Node (JSON-RPC Endpoint): https://kovan3.arbitrum.io/rpc

Rollup Chain ID: 79377087078960

Testnet Version: v3

Chain Launched on January 11, 2021

Deploying your contracts

Deploying your contracts onto the Arbitrum testnet is as easy as changing your RPC endpoint to https://kovan3.arbitrum.io/rpc

For a deeper dive into deploying with truffle see here.

Porting your frontend

Porting your frontend is just as easy as deploying your contracts. Just take your existing frontend and point it at our RPC endpoint after deploying your contract. For more information and code samples see here

If you're using metamask, add a custom RPC network to connect to the Arbitrum testnet:

• Network Name: Arbitrum Testnet V3
• New RPC URL: https://kovan3.arbitrum.io/rpc
• ChainID (Optional): 79377087078960
• Symbol: ETH
• Block Explorer URL: https://explorer.arbitrum.io/#/

Observing transactions

If you'd like to see your transactions in action, check out our block explorer!

There you'll be able to see all the transactions being executed in Arbitrum and also see exactly how much Ethereum Gas each transaction uses.