Cross-chain · Base → Arbitrum One

Swap WETH from Base to ARB on Arbitrum One

Swap WETH from Base to ARB on Arbitrum One. Base WETH leaves, and the ARB governance token arrives on Arbitrum One.

Approve wrapped ETH at 0x4200000000000000000000000000000000000006 on Base, chain 8453. Basescan is where that allowance sits, and it costs ETH. Receive ARB at 0x912CE59144191C1204E64559FE8253a0e49E6548 on chain 42161. Arbiscan lists it as the governance token, not as gas. Native ETH is 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE and is not the output. WETH on One at 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1 is not the output either. This is Arbitrum One, not Nova.

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

Wrapped ether for a governance token

You are not moving WETH to Arbitrum. You are selling it for ARB, which trades on its own market. The minimum on the quote is the floor while that price can move. If the floor is a poor trade, do not sign. There is no promised bridge time and no promised ARB price. Read both numbers as they stand on the quote you are asked to sign.

ARB still needs ETH beside it

Chain 42161 will not accept ARB as a fee. The ETH that paid the Base approval does not travel. If One has no ETH, Arbiscan can show the governance token and the wallet can still refuse the transfer. Fund ETH on One before you depend on sending ARB anywhere.

Simpler jobs that are not this page

Unwrap on Base if you need Base ETH. Buy One WETH if a pool wants 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1. Buy native USDC or Tether if the order is a dollar. Stay off Nova. WBTC is not a substitute and is not native bitcoin. How cross-chain bridges work applies only when ARB on One really is the target.

What a correct pair of receipts looks like

Basescan: WETH down at the predeploy. Arbiscan: ARB up at 0x912CE59144191C1204E64559FE8253a0e49E6548. No native ETH increase is required for success, and none should be expected from this quote. Chain id 42161 must be selected or you will look on the wrong network.

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 WETH from Base to ARB on Arbitrum One?

Approve wrapped ETH at 0x4200000000000000000000000000000000000006 on Base, chain 8453. Basescan is where that allowance sits, and it costs ETH.

Does ARB pay gas after this swap?

No. ARB at 0x912CE59144191C1204E64559FE8253a0e49E6548 is the governance token. Gas on Arbitrum One is ETH, marked 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE in quotes. You need that ETH on chain 42161, separate from Base. Until it is there, the ARB balance cannot be sent. Arbiscan can show the token while the wallet still refuses to move it.

Is this a way to move WETH onto Arbitrum?

No. WETH on One is 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1. This route spends Base WETH at 0x4200000000000000000000000000000000000006 and delivers ARB. If the pool asked for the One WETH contract, leave this page. Arbiscan will not show a WETH credit from this quote. You sold the wrapper for ARB, and the two contracts are not substitutes.

What if my Base balance is native ETH?

Then this route sees nothing to approve. Native ETH is the gas coin on chain 8453, not the input. Wrap into the predeploy first, or pick a route that sells native ETH for ARB. The wrap is a Base transaction and does not by itself create ARB.

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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