How to add multiple networks in MetaMask?

Adding Custom Networks Manually

1. Open MetaMask and click the network dropdown located in the top-left corner of the interface.

2. Select “Add network” and then choose “Add a network manually” from the options.

3. Enter the required parameters: Network Name, New RPC URL, Chain ID, Currency Symbol (e.g., ETH), and Block Explorer URL.

4. Ensure the Chain ID matches the target network’s official specification to avoid transaction failures or asset loss.

5. Click “Save” — the network will appear in your list and become immediately selectable.

Using Preconfigured Network Lists

1. Visit trusted community-maintained repositories such as Chainlist.org, which aggregates verified EVM-compatible networks.

2. Search for the desired network — Scroll zkEVM, Base, Optimism, Arbitrum, or Polygon zkEVM — and verify its status as “Live” and “Verified”.

3. Connect your MetaMask wallet directly through the site using the “Connect Wallet” button.

4. Click “Add to MetaMask” next to the network entry; the extension automatically populates all required fields.

5. Confirm the addition in the MetaMask popup window without manual input.

Switching Between Networks Seamlessly

1. After adding multiple networks, return to the network selector dropdown to view all available entries.

2. Click any network name to instantly switch context — balances, transaction history, and dApp interactions update accordingly.

3. Note that each network maintains independent account states; addresses remain identical across chains but balances and contract deployments do not carry over.

4. When interacting with cross-chain bridges or Layer 2 applications, always double-check the active network before signing transactions.

5. Use visual indicators — such as chain-specific icons or color-coded labels — to reduce misselection risk during rapid switching.

Managing Testnet Configurations

1. Enable “Show test networks” in MetaMask Settings → Advanced to expose Goerli, Sepolia, Holesky, and other testing environments.

2. Add Scroll Alpha Testnet by entering its official RPC endpoint: https://alpha-rpc.scroll.io/.

3. Set Chain ID to 534353 and Currency Symbol to “ETH” — matching Scroll’s documented configuration.

4. Obtain Goerli ETH via faucets like https://goerli-faucet.pk910.de/ before bridging to Scroll L2.

5. Confirm successful connection by checking block height updates and verifying contract interaction capabilities on deployed dApps like TicTacToe on Scroll.

Frequently Asked Questions

Q: Can I add non-EVM networks like Solana or Cosmos to MetaMask?MetaMask natively supports only Ethereum-compatible chains. Solana, Cosmos, and similar ecosystems require dedicated wallets such as Phantom or Keplr.

Q: Why does my transaction fail after switching networks?Transactions may fail due to mismatched Chain ID, insufficient gas tokens on the selected network, or incompatible dApp frontend logic tied to a specific RPC endpoint.

Q: Is it safe to use third-party RPC URLs from unverified sources?No. Untrusted RPC providers can log queries, manipulate responses, or inject malicious payloads. Always source endpoints from official documentation or audited aggregators like Chainlist.

Q: How do I remove an incorrectly added network?Go to MetaMask Settings → Networks → select the unwanted network → click the trash icon. Confirm deletion in the modal dialog.