Bridge to B3 Testnet
Easily bridge from Base Sepolia (Base Testnet) to B3 Sepolia (B3 Testnet) by following the steps below!
This bridge is specifically for testnet purposes. Use free testnet ETH to test your applications before deploying to mainnet.
How to Bridge
Visit the Testnet Bridge
Go to testnet.bridge.b3.fun to access the official testnet bridge interface.
Connect your Wallet
Connect your wallet (MetaMask, Coinbase Wallet, etc.) to the bridge interface.
Make sure your wallet is connected to either Base Sepolia or B3 Testnet depending on which direction you want to bridge.
Choose Bridge Direction
Select whether you want to:
- Deposit: Bring funds from Base Sepolia → B3 Testnet
- Withdraw: Bridge back from B3 Testnet → Base Sepolia
Click either the Deposit or Withdraw tabs accordingly.
Enter Amount
Enter the amount of ETH you want to bridge.
Confirm Transaction
Click "Deposit" (or "Withdraw") and confirm the transaction prompt that appears in your wallet.
Double-check that you're on the correct testnet and using testnet ETH, not mainnet funds.
Wait for Completion
Wait a few minutes for the bridge process to complete. You can check the status in your "History" tab.
Your testnet ETH will appear in your wallet on the destination network within a few minutes.
Network Information
Chain ID: 84532
RPC: https://sepolia.base.org
Explorer: https://sepolia.basescan.org
Chain ID: 1993
RPC: https://testnet-rpc.b3.fun
Explorer: https://testnet-explorer.b3.fun
Testnet Resources
Additional Faucets
If you need testnet ETH for development, here are some reliable faucet options:
- Coinbase Base Faucet - Official Coinbase faucet
- Alchemy Base Sepolia Faucet - Reliable faucet for Base Sepolia ETH
- QuickNode Base Faucet - Multiple testnet support
- B3 Testnet Faucet - Official B3 testnet faucet
- Get free B3 testnet ETH directly without bridging
Troubleshooting
- Check the transaction status on the block explorer
- Verify you're connected to the correct testnet
- Try increasing gas fees if the transaction is pending
- Contact support if the bridge has been pending for over 30 minutes
- Ensure your wallet supports the testnet networks
- Try refreshing the page and reconnecting
- Check that you're on the correct network in your wallet
- Clear your browser cache if issues persist
- Make sure you have enough ETH to pay for gas fees
- Use a faucet to get more testnet ETH
- Try bridging a smaller amount to conserve gas
Development Workflow
Get Base Sepolia ETH
Use a Base Sepolia faucet to get free testnet ETH.
Bridge to B3 Testnet
Use the testnet bridge to move ETH from Base Sepolia to B3 Testnet.
Deploy and Test
Deploy your contracts and test your applications on B3 Testnet.
Ready for Mainnet
When testing is complete, deploy to B3 Mainnet using the mainnet bridge.