Cross-chain · Polygon → Base
Swap USDT from Polygon to WETH on Base
Swap USDT from Polygon to WETH on Base. Tether USDT leaves Polygon. WETH is what can arrive on Base. You take ether exposure in the predeploy, which still needs a separate ETH balance.
The source is 0xc2132D05D31c914a87C6611C10748AEb04B58e8F. The destination is 0x4200000000000000000000000000000000000006. Native ETH is the gas label, and this page does not buy it. Polygonscan for Tether. Basescan for WETH on chain id 8453. Polygon is only the chain that charges POL for the send.
Empty ETH, frozen wrapper
Ethereum WETH is not the Base predeploy
Tether is the debit only
Layer 2, not Nova and not Arbitrum
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 Polygon to WETH on Base?
The source is 0xc2132D05D31c914a87C6611C10748AEb04B58e8F. The destination is 0x4200000000000000000000000000000000000006. XAUConnect compares live routes and lets your own wallet sign.
Can I unwrap without ETH on Base?
No. 0x4200000000000000000000000000000000000006 needs ETH gas on chain id 8453. This quote does not deliver that ETH. ETH is not WETH. Basescan can list WETH beside an empty ETH line. Fund ETH first. The same predeploy address on another chain is a different balance. WETH cannot pay the fee to unwrap itself.
Is Polygon USDT the Ethereum contract?
No. Ethereum Tether is 0xdAC17F958D2ee523a2206206994597C13D831ec7. This route spends 0xc2132D05D31c914a87C6611C10748AEb04B58e8F on chain id 137. Polygonscan is the debit. Approving the Ethereum contract does nothing here. POL pays the source fee. Chain id 137 is not Ethereum, and the contracts differ. Stay on Polygon for this Tether debit.
What if I needed spendable gas?
Leave this page. Native ETH uses 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE. WETH will not pay the next Base transaction. Sign the native output if the funds you move have to fund chain id 8453. This is an Ethereum layer 2, not mainnet. WETH will not pay the next fee on Base.
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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