What Is the Base Bridge?
The Base Bridge is the official mechanism for moving assets between Ethereum mainnet (Layer 1) and the Base network (Layer 2). It's built directly into the OP Stack infrastructure that Base runs on, making it the most trust-minimized way to transfer assets between the two networks.
You can access the official Base Bridge at bridge.base.org. There are also third-party bridges that offer faster withdrawals or support more token types — we'll cover those distinctions below.
Depositing: Moving Assets from Ethereum to Base
Depositing (Ethereum → Base) is generally straightforward and fast:
- Go to bridge.base.org and connect your wallet.
- Make sure your wallet is set to the Ethereum mainnet network.
- Select the asset you want to bridge (typically ETH or an ERC-20 token).
- Enter the amount and click Deposit.
- Confirm the transaction in your wallet and pay the Ethereum mainnet gas fee.
- Wait approximately 1–3 minutes for your funds to appear on Base.
The gas fee for a deposit is paid in ETH on Ethereum mainnet — this is the main cost of the operation. The deposit itself on the Base side is free.
Withdrawing: Moving Assets from Base Back to Ethereum
Withdrawing (Base → Ethereum) is more involved due to how Optimistic Rollups work:
- Connect your wallet on bridge.base.org, switch to the Base network.
- Select the asset and amount to withdraw and initiate the transaction.
- After the Base transaction confirms, you enter a 7-day challenge window. This is a security feature of Optimistic Rollups — it allows time for fraud proofs to be submitted if needed.
- After 7 days, you return to the bridge and click Claim to finalize the withdrawal on Ethereum mainnet (this requires one more Ethereum gas payment).
The 7-day wait is the biggest friction point for most users. If you need faster withdrawals, third-party bridges are an alternative.
Third-Party Bridges: Faster Alternatives
Several third-party bridge aggregators offer faster withdrawals from Base to Ethereum by using liquidity pools — they give you the funds immediately on the destination chain and handle the official 7-day process themselves in exchange for a small fee.
Popular options include:
- Across Protocol — Known for fast, capital-efficient bridging.
- Stargate Finance — Supports cross-chain transfers across many networks.
- Relay.link — A Base-friendly bridge aggregator with competitive rates.
Important: Third-party bridges introduce additional smart contract risk compared to the official bridge. Only use established, audited protocols, and always double-check the URL before connecting your wallet.
What Assets Can You Bridge?
| Asset | Official Base Bridge | Third-Party Bridges |
|---|---|---|
| ETH | ✅ Yes | ✅ Yes |
| USDC | ✅ Yes | ✅ Yes |
| DAI, USDT | ✅ Selected tokens | ✅ Often supported |
| NFTs (ERC-721) | ❌ Not supported | ⚠️ Limited support |
| Long-tail ERC-20s | ⚠️ Some supported | ⚠️ Varies by bridge |
Common Mistakes to Avoid
- Sending to the wrong network — Always confirm your wallet is on the correct source network before initiating a transfer.
- Not having ETH for gas — You need ETH on Ethereum mainnet to pay gas for deposits and withdrawal claims.
- Using unofficial bridge sites — Bridge phishing sites are common. Only use bridge.base.org or well-known, verified third-party bridges.
- Forgetting to claim withdrawals — After 7 days, you must return to claim your withdrawal. Set a reminder.
The Easiest Option: Coinbase to Base
If you're a Coinbase user, the simplest way to get ETH onto Base is to send directly from your Coinbase account to your Base wallet address. When withdrawing from Coinbase, select Base as the network. This bypasses the bridge entirely and avoids Ethereum mainnet gas fees. Funds typically arrive within minutes.