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

# Arbitrum

> Build on Arbitrum One and Arbitrum Nova

<Warning>
  **Looking for Contributors!** This Skill needs an implementation.

  Contributing a Skill involves:

  1. Writing a reference implementation with full functionality
  2. Adding comprehensive tests
  3. Writing documentation with usage examples

  See the [ethers-provider Skill](https://github.com/evmts/voltaire/tree/main/examples/ethers-provider) for an example of a complete Skill implementation.

  Interested? Open an issue or PR at [github.com/evmts/voltaire](https://github.com/evmts/voltaire).
</Warning>

<Info>
  **Skill** — Copyable reference implementation. Use as-is or customize. See [Skills Philosophy](/concepts/skills).
</Info>

Build on Arbitrum with native bridging and Stylus support.

## Planned Implementation

### Provider Setup

```typescript theme={null}
import { Arbitrum } from './Arbitrum.js';

const arb = Arbitrum({
  l1Provider,
  l2Provider,
  l1Gateway: L1_GATEWAY_ROUTER,
  l2Gateway: L2_GATEWAY_ROUTER,
});
```

### Bridge Assets

```typescript theme={null}
// Deposit ETH to L2
await arb.depositEth({
  amount: parseEther('1'),
  signer: l1Signer,
});

// Deposit ERC20
await arb.depositToken({
  l1Token: USDC_L1,
  amount: parseUnits('1000', 6),
  signer: l1Signer,
});

// Withdraw to L1 (7 day delay)
await arb.withdrawEth({
  amount: parseEther('1'),
  signer: l2Signer,
});
```

### Retryable Tickets

```typescript theme={null}
// Create L1->L2 message
const ticket = await arb.createRetryableTicket({
  to: l2Contract,
  l2CallValue: 0n,
  data: encodedCall,
  maxSubmissionCost,
  gasLimit: 1000000n,
  maxFeePerGas,
  signer: l1Signer,
});

// Redeem failed ticket
await arb.redeemRetryable({
  ticketId,
  signer: l2Signer,
});
```

### ArbOS Precompiles

```typescript theme={null}
// Get L1 block number
const l1Block = await arb.arbSys.arbBlockNumber();

// Get L2 to L1 tx count
const count = await arb.arbSys.sendTxToL1Count();
```

## Resources

* [Arbitrum Documentation](https://docs.arbitrum.io/)
* [Arbitrum SDK](https://github.com/OffchainLabs/arbitrum-sdk)
* [Stylus Documentation](https://docs.arbitrum.io/stylus/stylus-overview)

## Related

* [op-stack](/skills/op-stack) — OP Stack chains
* [tempo](/skills/tempo) — Tempo chain