Cross-chain · Arbitrum One → Ethereum

Swap USDT from Arbitrum One to DAI on Ethereum

Swap USDT from Arbitrum One to DAI on Ethereum. Tether USDT is spent, and Maker DAI is what can arrive.

DAI on Ethereum is the Maker contract 0x6B175474E89094C44Da98b954EedeAC495271d0F. It uses eighteen decimals, not six. Open it on Etherscan. The USDT you sell is 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9 on Arbitrum One, and Arbiscan is where that page lives. That USDT is Tether. Arbitrum One is chain id 42161, not Nova, and the fee is ETH. Ethereum is chain id 1. A block there is about 12 seconds. Do not treat that interval as a time for the credit to land.

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

Maker issues DAI, Tether does not

DAI at 0x6B175474E89094C44Da98b954EedeAC495271d0F is Maker's stablecoin on Ethereum. It is backed by collateral inside Maker's system, not by Tether's reserves and not by Circle. The token leaving Arbitrum One is Tether USDT. A wallet that only checks the word dollar will hide that change of issuer. If your destination app whitelists Circle USDC only, DAI will not satisfy it, even though both are often called stablecoins.

Six decimals out, eighteen in

Arbitrum USDT uses six decimals. Ethereum DAI uses eighteen. The raw integer on the receive side is much larger for the same dollar size, and a sloppy copy of the smallest unit will look absurd. Trust the human amount on the quote, then confirm the contract on Etherscan so you know the decimals belong to Maker DAI. Do not compare the raw unit of USDT with the raw unit of DAI and call the gap a fee.

ETH still pays the Arbitrum fee

Selling USDT does not pay gas. Chain id 42161 charges ETH. Keep a fee balance beside the Tether balance. You are not asked to approve DAI in order to receive it. Approval, if the allowance is empty, is for 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9 on Arbitrum One. How cross-chain bridges work is worth reading if the approval chain and the receive chain feel swapped.

Use another route for Circle or for Tether

This page is wrong if you wanted Circle USDC at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48, and wrong if you wanted Ethereum Tether at 0xdAC17F958D2ee523a2206206994597C13D831ec7. It does not deliver either. It is wrong on Arbitrum Nova, wrong for a same-chain swap, and wrong if you think DAI is just USDT under another ticker. Native ETH, named by the 0xEeee sentinel, is also not what arrives.

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 DAI on Ethereum?

DAI on Ethereum is the Maker contract 0x6B175474E89094C44Da98b954EedeAC495271d0F. It uses eighteen decimals, not six.

Is DAI on this route issued by Tether or Circle?

Neither. The DAI you can receive is Maker's contract at 0x6B175474E89094C44Da98b954EedeAC495271d0F on Ethereum. Tether is the issuer of the USDT you spend, 0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9. Circle is not in this pair. Check the Maker address on Etherscan before you treat the balance as the dollar token a protocol expects.

Why does the unit size look different?

USDT on Arbitrum One has six decimals. DAI on Ethereum has eighteen. One DAI is a much larger raw integer than one USDT. The quote should show both amounts in whole tokens. If you are comparing base units from the two explorers, the integers will not match even when the dollar value is close.

Does this page also unwrap ETH?

No. ETH and WETH are not the assets in this quote. You spend Tether and you can receive Maker DAI. The gas sentinel 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE is not the output. You still need a little ETH on Arbitrum One, chain id 42161, to pay the fee. Nova is the wrong network for that fee.

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