To send ETH from Ethereum mainnet to Optimism, you'll use the official Optimism bridge. Here are the main methods:
## Method 1: Official Optimism Gateway (Recommended)
1. **Visit the official bridge**: Go to [app.optimism.io/bridge](https://app.optimism.io/bridge)
2. **Connect your wallet**: Connect MetaMask or your preferred Web3 wallet
3. **Select networks**:
- From: Ethereum Mainnet
- To: Optimism
4. **Enter amount**: Specify how much ETH you want to bridge
5. **Confirm transaction**: Pay the gas fee on Ethereum mainnet
6. **Wait for confirmation**: The transfer typically takes 1-5 minutes
## Method 2: Through MetaMask Portfolio
1. Go to [portfolio.metamask.io/bridge](https://portfolio.metamask.io/bridge)
2. Select Ethereum → Optimism
3. Choose ETH and enter amount
4. Complete the transaction
## Method 3: Third-party bridges (faster but may have fees)
- **Hop Protocol**
- **Across Protocol**
- **Synapse Protocol**
## Important Notes:
- **Gas fees**: You'll pay Ethereum mainnet gas fees for the bridge transaction
- **Time**: Official bridge takes 1-5 minutes
- **Security**: Always use official bridges when possible
- **Add Optimism network**: Make sure you have Optimism network added to your wallet to see your bridged ETH
## Adding Optimism to MetaMask:
- Network Name: Optimism
- RPC URL: https://mainnet.optimism.io
- Chain ID: 10
- Symbol: ETH
- Block Explorer: https://optimistic.etherscan.io
Would you like more details about any of these steps?