Cross-chain · Arbitrum One → Base

Swap USDT from Arbitrum One to ETH on Base

Swap USDT from Arbitrum One to ETH on Base. Tether USDT leaves Arbitrum One and native ETH arrives on Base.

Sell 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9, Tether on Arbitrum One. Arbiscan, chain id 42161, not Nova. Keep ETH for the fee. Receive native ETH on Base, sentinel 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, chain id 8453. Basescan shows the balance. It is not the WETH predeploy and not mainnet ETH. Base is an L2. Blocks are about 2 seconds. The bridge does not adopt that interval as a deadline.

Diagram for Swap USDT from Arbitrum One to ETH on Base — USDT leaves Arbitrum One. ETH is what can arrive on Base.

Gas on Base, bought with Tether

Use this page when a Base wallet needs ETH to sign and you hold USDT on Arbitrum One. The output is the fee coin of chain id 8453. It is not 0x4200000000000000000000000000000000000006. It will not show on Etherscan as Ethereum ETH. A mainnet gas shortage is a different chain. Basescan and chain id 8453 are the checks that the credit landed where the wallet is pointed.

The source fee is a separate ETH

You cannot start with zero ETH on Arbitrum One. Tether does not pay chain id 42161. The ETH you receive on Base arrives too late to fund the signature, and it lives on the other rollup anyway. Nova is not a spare tank. If the Arbitrum ETH row is empty, fix that before you look at the USDT amount.

A dollar token into a volatile fee coin

The minimum ETH moves with the market. Refresh the quote. Six-decimal USDT against eighteen-decimal ETH should be read in whole units. How to bridge assets between chains explains the rollup hop. It does not freeze ETH's price against Tether.

Wrong for wrapped ether and for staying in dollars

If a Base contract wants the WETH predeploy, this native output fails the ERC-20 check until you wrap, and wrapping needs a bit of the ETH you just received. If you wanted Circle USDC on Base, this is the wrong ticker. If you wanted USDT to remain USDT, this page sells it.

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 ETH on Base?

Sell 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9, Tether on Arbitrum One. Arbiscan, chain id 42161, not Nova.

Does this ETH show up on Ethereum mainnet?

No. The receive network is Base, chain id 8453, an L2. The marker is 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, native gas on Base. Etherscan is the wrong explorer. Basescan is the right one. You spend Tether at 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9 on Arbitrum One. Mainnet ETH is a different balance on chain id 1.

Is this the same as Base WETH?

No. Base WETH is 0x4200000000000000000000000000000000000006. This route credits the gas coin. Contracts that only pull WETH will not see it until you wrap. Leave a little ETH for that wrap. About 2 seconds is a Base block interval, not the wrap, and not a bridge schedule.

Why do I need ETH on Arbitrum if I am trying to get ETH on Base?

Because the transaction that starts the route is on chain id 42161, and that chain charges its own ETH. Base ETH cannot pay it. Tether cannot pay it. Hold a source fee, then receive a destination fee. They are not one balance. Nova is not chain id 42161.

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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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