Cross-chain · Ethereum → Base
Swap USDT from Ethereum to WETH on Base
Swap USDT from Ethereum to WETH on Base. Traders who want wrapped ETH on chain 8453 spend Tether from Ethereum and receive the Base WETH predeploy.
The output is 0x4200000000000000000000000000000000000006 on Basescan, an 18 decimal ERC-20. It will not pay gas on Base. You spend Tether at 0xdAC17F958D2ee523a2206206994597C13D831ec7 on Etherscan, 6 decimals. Ethereum WETH at 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 is a different contract. Chain id 1 gas is ETH, about 12 seconds a block. Chain id 8453 gas is a separate ETH balance. Switch to Base and import the predeploy before you look for the tokens in the mainnet WETH row. Switch to Base and import the predeploy from Basescan before you assume the WETH is missing from the Ethereum wallet. Confirm the predeploy on Basescan before you deposit it.
Sell Tether for WETH on mainnet if you are staying
Tether in, predeploy out
Neither token pays both fees
Pools that list WETH on Base
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 Ethereum to WETH on Base?
The output is 0x4200000000000000000000000000000000000006 on Basescan, an 18 decimal ERC-20. It will not pay gas on Base.
Will my Ethereum WETH balance increase?
No. Ethereum WETH stays at 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 on Etherscan. This route pays 0x4200000000000000000000000000000000000006 on Basescan. Switch the wallet to Base, chain id 8453, before you look. If the wallet is still on Ethereum, the new WETH is invisible and the old one is unchanged.
Why does the send ask for ETH when I am spending USDT?
Tether at 0xdAC17F958D2ee523a2206206994597C13D831ec7 is an ERC-20. Moving it on chain id 1 costs ETH. The approval can be its own transaction. A wallet that holds only USDT cannot finish. Add ETH for gas. Blocks are about 12 seconds. ETH on Base is a later, separate requirement.
Does this WETH pay the next swap's fee?
It can be the asset you sell. The network fee is ETH on chain id 8453. If that gas balance is empty, the WETH can be visible on Basescan and still be stuck. Fund ETH on Base, or choose a route that outputs native ETH.
Trade on XAUConnect
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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