Cross-chain · BNB Chain → Base

Swap BNB from BNB Chain to WETH on Base

Swap BNB from BNB Chain to WETH on Base. You send native BNB on BNB Chain and you receive WETH on Base, not native ETH.

The BNB side is 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, the gas coin on chain id 56. No ERC-20 approval. BscScan shows the native send. Blocks are about 3 seconds. Leave BNB for the fee. Base WETH is 0x4200000000000000000000000000000000000006. Match it on Basescan, chain id 8453. It is not mainnet WETH and not the BNB Chain ETH peg. Base is an L2. You still need native ETH on Base to move the wrapper.

Diagram for Swap BNB from BNB Chain to WETH on Base
BNB leaves BNB Chain. WETH is what can arrive on Base.

Selling BNB for the predeploy

Native BNB is the input. The peg at 0x2170Ed0880ac9A755fd29B2688956BD959F933F8 is not. If your ether exposure on BNB Chain is only that peg, this page cannot see it. There is no approval for BNB, but the fee still comes out of BNB. Do not zero the balance and expect the swap to pass.

The predeploy cannot pay the L2

0x4200000000000000000000000000000000000006 is an ERC-20 on Base. ETH is the native coin. Basescan lists them apart. Receiving WETH does not give you ETH, so a new wallet gets a token it cannot move. Mainnet WETH will not update. The same address shape on another rollup is not this balance.

Native ETH on Base if you needed gas

This route is the wrong tool when the point was a spendable Base balance. USDC is the wrong tool when you wanted Circle's dollar token. How to bridge assets covers the hop from BscScan to Basescan. It does not promise a WETH amount.

Three checks before the wrapper is useful

The minimum WETH on the quote, the BNB you keep for chain id 56, and the ETH already on chain id 8453. A 3 second source block does not replace any of them. Sign only if the WETH floor is acceptable. If the quote expired, price it again.

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 BNB from BNB Chain to WETH on Base?

The BNB side is 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, the gas coin on chain id 56. No ERC-20 approval.

Will Base WETH show up as ETH in the wallet?

No. ETH is the gas coin. WETH is the predeploy 0x4200000000000000000000000000000000000006 on Basescan, chain id 8453. The BNB you sent was the marker 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE on BscScan. They stay different. You need ETH already if you want to transfer the wrapper. Base is an L2, not mainnet.

Is 0x4200 the Ethereum mainnet WETH address?

No. Mainnet WETH is a different contract on Etherscan. This payout is the Base predeploy, and other rollups can share the same address shape. This page is chain id 8453 only. You also need BNB left for the source fee. There is no ERC-20 approval on the BNB. Basescan is the explorer.

What if I only hold the ETH peg on BNB Chain?

This page will not spend it. The peg is 0x2170Ed0880ac9A755fd29B2688956BD959F933F8 and has its own route to Base WETH. You need native BNB here, both to sell and to pay gas. If BscScan shows only dust BNB, the route cannot start. Open the peg page instead.

Live execution

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.

Swap cross-chainExplore markets

Continue exploring

Related markets, guides & networks

Next pages on this subject. Read them before you trade.

Networks
Tokens
Guides
Articles

Build programmatically

Swap via API for bots and AI agents: quotes, builds, and cross-chain routes.

Developer quickstart