Cross-chain · Arbitrum One → Ethereum

Swap ARB from Arbitrum One to WETH on Ethereum

Swap ARB from Arbitrum One to WETH on Ethereum. ARB leaves Arbitrum One and canonical WETH arrives here on Ethereum.

Spend 0x912CE59144191C1204E64559FE8253a0e49E6548, the ARB token, on Arbitrum One. Arbiscan confirms it. Chain id 42161, not Nova. Gas is native ETH at 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, and ARB cannot cover it. The receive contract is 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 on Ethereum. That is WETH, an ERC-20, not the gas sentinel. Etherscan is the explorer. Chain id 1 blocks fall about every 12 seconds and do not time the route.

Diagram for Swap ARB from Arbitrum One to WETH on Ethereum
ARB leaves Arbitrum One. WETH is what can arrive on Ethereum.

WETH9 on mainnet is a specific deployment

0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 is the canonical WETH contract traders expect on Ethereum. Arbitrum's own WETH, 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1, is not what you sell and not what you receive. You sell ARB. If a quote or a portfolio substitutes one wrapped contract for the other because the ticker matches, stop and compare characters on Etherscan and Arbiscan.

You still need mainnet gas from somewhere else

WETH does not pay Ethereum fees. If this wallet has no native ETH on chain id 1, the new WETH can sit idle. Unwrapping needs gas you do not receive here. That is a reason to prefer a native ETH output when the next action is a plain transfer. It is a reason to keep this output when the next action is a pool that only pulls the WETH contract.

Allowance on ARB, fee in ETH

The permission, when needed, is an approval of 0x912CE59144191C1204E64559FE8253a0e49E6548 on chain id 42161. ETH pays it. You do not approve WETH in order to receive WETH. How cross-chain bridges work is enough background for that one-way permission. Keep a little ETH on Arbitrum One after the approval so the swap itself can follow in the same session.

Wrong when the output should be gas or ARB

This page is wrong if you need native ETH on Ethereum immediately. It is wrong if you need ARB to remain ARB. It is wrong for Circle USDC, Tether, and Maker DAI. It is wrong on Nova. It is wrong if you meant to wrap ETH you already hold on Ethereum, which is a local call to the WETH contract and does not involve ARB at all.

Legal

Risk disclosure

XAUConnect is a non-custodial swap aggregator. Digital assets are volatile and may lose value rapidly. Content on this page is educational and not investment advice. Verify every contract address on the official block explorer before approving a transaction.

Frequently asked questions

What is the best way to swap ARB from Arbitrum One to WETH on Ethereum?

Spend 0x912CE59144191C1204E64559FE8253a0e49E6548, the ARB token, on Arbitrum One. Arbiscan confirms it. XAUConnect compares live routes and lets your own wallet sign.

Is canonical WETH the same as native ETH?

No. This route can credit 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, which is WETH. Native ETH is the sentinel 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE and is not the output. You spend ARB at 0x912CE59144191C1204E64559FE8253a0e49E6548. One WETH is redeemable for one ETH only after you unwrap, and the unwrap needs gas you must already hold.

Am I selling Arbitrum WETH by mistake on this page?

Not if the spend address is 0x912CE59144191C1204E64559FE8253a0e49E6548. That is ARB. Arbitrum WETH is 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1. Check the approval screen against Arbiscan. If the wallet selected WETH, back out. Chain id 42161 must be active, not Nova. Confirm that address on the explorer before you sign, and refresh the quote if it has expired.

Will WETH on Ethereum let me transfer it with no ETH?

No. Moving an ERC-20 still costs native ETH on chain id 1. This route does not include that gas balance. If the account is new to Ethereum, fund a little ETH before you rely on the WETH. About 12 seconds is a block interval on Etherscan, not a schedule for either the bridge or a later transfer.

Live execution

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Open the swap page with this cross-chain route pre-selected, then connect your wallet on the source chain to quote and execute. You keep the keys.

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