Cross-chain · Arbitrum One → Base

Swap ARB from Arbitrum One to WETH on Base

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

Spend 0x912CE59144191C1204E64559FE8253a0e49E6548. Confirm it on Arbiscan. Chain id 42161, not Nova. Gas is native ETH. Receive 0x4200000000000000000000000000000000000006 on Base. Basescan should show the predeploy, not the gas sentinel and not Ethereum WETH. Chain id 8453 is an L2. Blocks are about 2 seconds. That interval does not lock the ARB price.

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

Three wrapped stories, one output

You do not sell Arbitrum WETH. You do not receive Ethereum WETH. You can receive the Base predeploy. Those three addresses are 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1, 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, and 0x4200000000000000000000000000000000000006. Only the last one is the credit, and only on chain id 8453. The same predeploy hex on another OP-stack chain is not your wallet.

WETH on Base still needs ETH on Base

The predeploy cannot pay gas. If you are funding a pool that pulls WETH, this output matches the call. If you are funding a wallet that needs to sign anything, you still need the sentinel balance. This route does not include it. Selling ARB also removes voting weight. The minimum WETH is a cross rate, not a governance wrap.

Allowance names the governance token

If an approval appears, it should name 0x912CE59144191C1204E64559FE8253a0e49E6548 and it should be paid in ETH on Arbitrum One. How cross-chain bridges work puts that permission on the source. A screen that shows WETH as the spend means you switched routes. Go back before you grant allowance.

Wrong when gas or ARB is the thing you need

Native ETH on Base is a different page. Circle USDC is a different page. Keeping ARB is not this page at all. Nova is the wrong source. Mainnet is the wrong destination. A local wrap of Base ETH does not involve the ARB contract on Arbiscan. Before you sign, compare 0x912CE59144191C1204E64559FE8253a0e49E6548 with 0x4200000000000000000000000000000000000006 on their explorers and stop if either address on the quote differs. If the quote expires, request another and read the new minimum before you sign. The destination fee token is a different balance from the one this route can credit.

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 Base?

Spend 0x912CE59144191C1204E64559FE8253a0e49E6548. Confirm it on Arbiscan. XAUConnect compares live routes and lets your own wallet sign.

Is 0x4200 Ethereum WETH?

No. It is the WETH predeploy on Base, chain id 8453. Ethereum WETH is 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2. Confirm the credit on Basescan. You spend ARB at 0x912CE59144191C1204E64559FE8253a0e49E6548. Native ETH, the sentinel, is not the output and is what Base uses for gas. Confirm that address on the explorer before you sign, and refresh the quote if it has expired.

Can I move this WETH if I have no Base ETH?

No. Chain id 8453 charges native ETH. The predeploy is an ERC-20. This route does not deliver the gas coin. About 2 seconds is a block interval, not a fee. You also need ETH on Arbitrum One to approve ARB. The two ETH balances are not interchangeable.

Does the ARB I sell become voting power on Base?

No. Sold tokens leave Arbitrum One. They are not bridged as ARB, and WETH has no ARB vote. Keep the amount you need for governance. Chain id 42161, not Nova, holds whatever remains. If the quote expires, the WETH minimum expires with it. Confirm the address on the explorer before you sign.

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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