How to Bridge ETH From Base to Ethereum

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381e35

11/12/2026

#plugs#across#base#ethereum#eth#bridging#how to
Getting
off Base and back to Ethereum is slower than getting it on, if you use Base's own bridge. A withdrawal through it waits out a challenge period of about seven days, and you send a transaction on Ethereum to prove it and another to finalize it. An intent bridge like Across skips the wait: a relayer pays you on Ethereum within seconds and waits out the slow path itself.

How Across Bridges

You deposit
into Across's contract on Base and name what you want on Ethereum. A relayer sees the deposit and pays you on Ethereum from its own funds. Across repays the relayer later from the deposit. You pay a relayer fee, taken out of the amount that arrives, and that fee covers the relayer's Ethereum gas, which is why this direction costs more than Ethereum to Base.
On Ethereum, Across pays out
to a regular wallet. If the receiving address is a smart contract wallet, it pays
instead, which unwraps to
one for one.

Bridging By Hand

  1. Open Across's app and connect your wallet.
  2. Pick Base as the origin, Ethereum as the destination, and
    on both sides.
  3. Enter the amount and check the amount you will receive.
  4. Confirm the deposit on Base. The
    shows up on Ethereum within seconds.

Bridge With Plug

Use in App
  1. Reads your wallet address.
  2. Deposits 0.1
    into Across on Base, to be paid out to that address on Ethereum.
The amount you receive on Ethereum is quoted from Across when the plug compiles, not fixed when it was written, so it follows the current fee. Change 0.1 to the amount you want to move.

What It Costs

We simulated the plug on Base in November 2026, with
at about $1,925.
  • Relayer fee. Across quoted 0.0000713
    on a 0.1
    bridge, about 14 cents, so 0.0999287 arrives on Ethereum. It estimated the fill at about 8 seconds.
  • Gas. The deposit runs on Base, where the run's 431,000 gas cost well under a cent.
The relayer fee is mostly a flat gas cost, so it is a smaller share of larger amounts. Base's own bridge costs only gas, but you pay Ethereum gas twice and wait the seven days.

Related

  • How to bridge ETH from Ethereum to Base covers the other direction.
  • How to bridge USDC from Base to Arbitrum covers moving
    off Base with Across.
  • How to automatically sell ETH for USDC on Base covers selling it on Base instead of moving it.

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How to Bridge ETH From Base to Ethereum

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