Cross-chain · Arbitrum One → Ethereum

Swap USDT from Arbitrum One to WETH on Ethereum

Swap USDT from Arbitrum One to WETH on Ethereum. Tether USDT leaves Arbitrum One and WETH arrives here on Ethereum.

WETH here is 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, the canonical contract on Ethereum. Read it on Etherscan. It is an ERC-20, not the native gas sentinel 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE. The sold asset is Tether USDT at 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9, which you confirm on Arbiscan. Source chain id is 42161, Arbitrum One, not Nova. Fee token is ETH. Destination chain id is 1. Ethereum blocks average about 12 seconds and do not schedule the bridge.

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

WETH9 is the contract you should see

The address 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 is the usual WETH9 deployment on Ethereum. Other contracts have used the same ticker. Etherscan's token page for that exact address is the one that counts. If a portfolio labels a different contract as WETH, do not treat it as the output of this quote. The input side is stricter too: only Tether at 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9 on Arbitrum One is the spend.

Receiving WETH does not fill the gas tank

You can hold a large WETH balance on Ethereum and still be unable to send a transaction, because fees come from native ETH. If this wallet has never held mainnet ETH, plan for that gap before you rely on the WETH. Unwrapping WETH into ETH is possible later, but the unwrap itself needs gas you do not get from this route. The sentinel address is what a gas-seeking route would have used instead.

Approve Tether, not the destination

If USDT allowance is zero, the wallet asks for approval on Arbitrum One before it can move 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9. Pay that approval in ETH. You do not approve the Ethereum WETH contract to receive it. A receiver address has to be a normal Ethereum account that can hold ERC-20s. The steps in how to bridge assets between chains keep the approval on the source network.

Switch routes for native ETH or for DAI

This is the wrong page if you need native ETH on Ethereum to pay gas immediately. It is the wrong page if you wanted Maker DAI or Circle USDC. It is the wrong page if you meant to sell Arbitrum WETH at 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1 rather than Tether. Nova, and a swap that should stay inside Arbitrum One, are different jobs as well.

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 USDT from Arbitrum One to WETH on Ethereum?

WETH here is 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, the canonical contract on Ethereum. Read it on Etherscan.

Can I unwrap this WETH without already having ETH?

Unwrapping calls the WETH contract and the call needs gas. Gas is native ETH, not WETH. If the Ethereum account has no ETH, the unwrap cannot be submitted. This route delivers 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 only. Use a route that credits the 0xEeee sentinel if the next thing you must do is pay a mainnet fee.

Is Arbitrum USDT the same contract as Ethereum USDT?

No. You spend 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9, Tether on Arbitrum One. Ethereum Tether is 0xdAC17F958D2ee523a2206206994597C13D831ec7, and this quote does not sell it or deliver it. Check the spend on Arbiscan under chain id 42161. The WETH you can receive is only on Ethereum, chain id 1. Confirm the address on the explorer before you sign.

Does WETH on Ethereum track native ETH one for one?

The canonical WETH contract is designed so one WETH redeems for one ETH, minus the gas of the unwrap. That relationship is not the same thing as holding ETH already. This quote is also a market from USDT into WETH, so the amount of WETH depends on price and fees. Read the minimum.

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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