Cross-chain · Base → Ethereum

Swap ETH from Base to USDC on Ethereum

Swap ETH from Base to USDC on Ethereum. Native ETH leaves Base, and Circle USDC is what arrives on Ethereum.

The asset you spend is native ETH on Base. Interfaces label it 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, and that string is a stand-in for the gas coin, not a token contract on Basescan. Base is chain 8453, an L2. The USDC you receive is Circle's Ethereum contract 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Etherscan. Ethereum is chain 1, and blocks take about 12 seconds. This USDC is 6 decimals. It is not Tether and not Maker DAI.

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

You are spending the gas coin

On Base, ETH pays fees and, on this route, ETH is also the asset being sold. If you spend the entire balance, the transaction cannot pay for itself. Leave enough ETH on chain 8453 for the network fee. There is no ERC-20 approval for native ETH. If the wallet asks you to approve WETH at 0x4200000000000000000000000000000000000006, you are on a different route than this one.

Circle on Ethereum, specifically

The arrival contract is the long-standing Circle USDC on mainnet. It is not a bridged IOU with a similar name, and it is not USDT at 0xdAC17F958D2ee523a2206206994597C13D831ec7. A treasury that whitelists only that Circle address will reject other dollar tokens even when the price matches. Read 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Etherscan and compare it with the quote before you sign.

L2 ETH is not already mainnet ETH

Holding ETH on Base does not mean you hold ETH on Ethereum. This swap sells the Base balance for dollars on mainnet. You do not arrive with native ETH on chain 1. You arrive with USDC, which cannot pay Ethereum gas. Fund a little mainnet ETH by some other means if you must move the USDC after it lands. How cross-chain bridges work describes the separation between the two receipts.

Skip this page when

Skip it if you wanted to move ETH and keep ETH. Skip it if the dollar you need is Tether or DAI. Skip it if a Base application already pays you in USDC and you never needed mainnet. Skip it if the quote's minimum USDC is below your floor. The block interval is about 12 seconds. The bridge wait on top of that is not a number this page will invent.

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 Base to USDC on Ethereum?

The asset you spend is native ETH on Base. Interfaces label it 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, and that string is a stand-in for the gas coin, not a token contract on Basescan.

Does native ETH on Base need an approval?

No. The 0xEeee placeholder means the gas coin, and gas coins are sent, not approved. You do need to leave some ETH behind so the fee can be paid. If the only ETH you have is WETH, an ERC-20, this native route will not see that balance until you unwrap it on Base.

Which USDC contract should Etherscan show?

Circle's Ethereum USDC at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48. A credit at any other dollar contract, including Tether or DAI, is a different trade. The source side is not a USDC transfer. It is native ETH leaving Base, chain 8453, which you trace on Basescan as a value transfer.

Will I have ETH for gas on Ethereum after this?

Not from this route. You sold Base ETH and bought USDC. USDC does not pay gas on chain 1. Blocks there are about 12 seconds once you do have ETH to spend. Bring a small ETH balance to Ethereum before you try to transfer the USDC out.

Live execution

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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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