Cross-chain · Ethereum → Base

Swap ETH from Ethereum to WETH on Base

Swap ETH from Ethereum to WETH on Base. Someone who needs wrapped ETH on chain 8453 spends native ETH on Ethereum and receives the Base WETH predeploy.

Wrapping on Ethereum is a deposit into 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, and that WETH stays on mainnet. This route spends native ETH, marked 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, and delivers 0x4200000000000000000000000000000000000006 on Basescan. Those are different contracts. Leave ETH for gas on chain id 1. The received token cannot pay ETH gas on Base. Blocks on Ethereum are about 12 seconds. Switch to chain id 8453 and read the predeploy on Basescan. A local wrap never creates that balance. A local wrap into mainnet WETH stays on chain id 1. This receipt is only the Basescan predeploy after you switch to Base. Confirm the predeploy on Basescan before you use it.

Diagram for Swap ETH from Ethereum to WETH on Base — ETH leaves Ethereum. WETH is what can arrive on Base.

A local wrap does not reach Base

This route is the wrong tool if you want WETH on Ethereum. Deposit ETH into 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 and stop. That contract never becomes 0x4200000000000000000000000000000000000006. Open this page when a Base pool asks for the Basescan predeploy. Ethereum is only the chain you sign on.

Native in, predeploy out

You do not approve the ETH. The placeholder means the gas coin on chain id 1. You do import, on chain 8453, the WETH at 0x4200000000000000000000000000000000000006. If the native ETH line on Ethereum is what you wanted to keep, this pair spends it.

Keep a fee on both chains

Chain id 1 charges ETH from the same balance you are selling. Chain id 8453 charges a different ETH balance. Base WETH pays neither. Budget ETH on Base before you use the wrapped token.

Pools that name WETH on Base

They mean 0x4200000000000000000000000000000000000006, 18 decimals. Landing that contract from native ETH lets you join those books. You do not receive mainnet WETH or a stablecoin. The amount is the quote you sign.

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 ETH from Ethereum to WETH on Base?

How is this different from wrapping ETH?

Wrapping deposits native ETH into 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 and stays on Ethereum. This route delivers Base WETH at 0x4200000000000000000000000000000000000006 on Basescan. The ticker matches. The chain and the contract do not. Use the wrap when the next signature is on chain id 1.

Do I approve ETH before sending?

No. It is recorded as 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE. You still must leave enough ETH to pay chain id 1 gas, or the send fails. Etherscan shows the native balance falling. Basescan shows the predeploy rising after you switch to Base, chain id 8453.

Can this WETH pay gas on Base?

No. Gas on chain id 8453 is ETH. The WETH can arrive and sit until ETH is added on Base. If you needed the gas coin itself, choose a route whose output is native ETH, the 0xEeee placeholder, on that chain.

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-chain Explore 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