> ## Documentation Index
> Fetch the complete documentation index at: https://docs.magic.link/llms.txt
> Use this file to discover all available pages before exploring further.

# Arbitrum

> Arbitrum is especially beneficial for those looking to boost performance while maintaining the decentralized principles of Ethereum.

## Overview

[Arbitrum](https://arbitrum.io/rollup) is a Layer 2 solution enhancing Ethereum by providing developers with faster and more cost-efficient transactions. It upholds Ethereum's security through its innovative Arbitrum Rollup protocol, facilitating trustless operations. For developers, its seamless compatibility with Ethereum's ecosystem and tools simplifies dApp development.

**As Arbitrum is EVM compatible**, you can follow the [Ethereum](/embedded-wallets/blockchains/ethereum/javascript) documentation to send your first transaction and utilize all other wallet features.

## Configure Arbitrum

Ensure you have installed the Magic SDK and have access to your API key, follow the [quickstart](/embedded-wallets/quickstart/overview) to get started. You can use Magic's network aliases to connect to either testnet or mainnet on Arbitrum.

<CodeGroup>
  ```js Testnet icon="square-js" theme={null}
  // Setting network to point to testnet
  const magic = new Magic('YOUR_PUBLISHABLE_API_KEY', {
    network: {
      rpcUrl: 'https://sepolia-rollup.arbitrum.io/rpc',
      chainId: 421614,
    }
  });
  ```

  ```js Mainnet icon="square-js" theme={null}
  // Setting network to point to mainnet
  const magic = new Magic('YOUR_PUBLISHABLE_API_KEY', {
    network: {
      rpcUrl: 'https://rpc.ankr.com/arbitrum',
      chainId: 42161,
    }
  });
  ```
</CodeGroup>

## Compatibility

* All `Auth`, `User` and `Wallet` module methods
* All EVM Provider functionality to respond to supported [RPC methods](/embedded-wallets/sdk/client-side/javascript#evm-rpc-methods)

*Need a feature or see a problem?* File an issue on our [github repo](https://github.com/magiclabs/magic-js).

## Resources & Tools

* Documentation: [https://docs.arbitrum.io/](https://docs.arbitrum.io/)
* Block Explorer:
  * [https://arbiscan.io/](https://arbiscan.io/) (Mainnet)
  * [https://sepolia.arbiscan.io/](https://sepolia.arbiscan.io/) (Testnet)
* Faucet: [https://faucet.quicknode.com/arbitrum](https://faucet.quicknode.com/arbitrum)