Cross-chain · Base → BNB Chain
Swap WETH from Base to USDT on BNB Chain
Swap WETH from Base to USDT on BNB Chain. Base WETH leaves, and 18 decimal USDT arrives on BNB Chain.
Approve and spend 0x4200000000000000000000000000000000000006 on Base, chain 8453. Basescan is the explorer, and gas for that approval is ETH. Receive 0x55d398326f99059fF775485246999027B3197955 on BNB Chain, chain 56. BscScan should show 18 decimals. Ethereum Tether at 0xdAC17F958D2ee523a2206206994597C13D831ec7 has 6 decimals and is not this balance. Native gas is the placeholder 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, meaning ETH on Base and BNB on the destination. You are buying neither native coin.
Wrapper in, wide-unit dollar out
An Ethereum USDT address will not see this credit
Wrong when the goal was simpler
Split receipts
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 WETH from Base to USDT on BNB Chain?
Approve and spend 0x4200000000000000000000000000000000000006 on Base, chain 8453. Basescan is the explorer, and gas for that approval is ETH.
Do I approve WETH, USDT, or both?
You approve Base WETH at 0x4200000000000000000000000000000000000006 so the router can take the input. You do not approve USDT in order to receive it. A later BNB Chain app may ask for a USDT allowance, and that signature would be on chain 56, paid in BNB. Keep those two requests on their own chains.
Why does this USDT use 18 decimals?
The contract 0x55d398326f99059fF775485246999027B3197955 on BNB Chain is an 18 decimal pegged token. Ethereum's Tether uses 6. Check the decimals field on BscScan instead of assuming the mainnet width. A script that scales by 1,000,000 will not report this balance correctly. The source token is Base WETH, which you approve on chain 8453, not on BNB Chain.
Can I start from native ETH on Base?
Not on this page. Native ETH is 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE and pays gas on chain 8453. This route only spends WETH. Wrap on Base first if the wrapper is what you meant to sell, or choose the native ETH route if you want to sell the gas coin directly.
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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