How to configure MetaMask for Manta Pacific? (Modular Scaling)

Adding Manta Pacific Network to MetaMask

1. Open MetaMask browser extension and click the network selector dropdown located at the top of the interface.

2. Select “Custom RPC” from the list of available options.

3. Enter https://pacific-rpc.manta.network/http as the RPC URL.

4. Input 169 as the Chain ID.

5. Set the Currency Symbol to ETH and the Block Explorer URL to https://pacific-explorer.manta.network.

Verifying Network Parameters

1. Confirm that the RPC endpoint responds without timeout or CORS errors by testing connectivity via browser console or curl command.

2. Check that the chain ID 169 matches exactly—case-sensitive and without leading zeros.

3. Validate the block explorer link opens correctly and displays recent blocks when pasted into a new tab.

4. Ensure the currency symbol remains uppercase “ETH”, not “eth” or “Eth”, to avoid display inconsistencies in transaction previews.

5. Cross-reference the official Manta documentation at https://docs.manta.network/pacific for any parameter updates released after March 2026.

Importing Testnet Tokens Manually

1. Navigate to the “Assets” tab inside MetaMask and click “Import Tokens”.

2. Switch to the “Custom Token” tab and select “Contract Address”.

3. Paste 0x5FbDB2315678afecb367f032d93F642f64180aa3 — this is the verified USDC.e contract address on Manta Pacific.

4. Confirm the token symbol auto-populates as “USDC.e” and decimals as “6”.

5. Click “Next”, then “Add Token” to finalize import.

Interacting with Pacific-Specific dApps

1. Visit https://swap.pacific.manta.network and connect your MetaMask wallet.

2. Verify the connected network shows “Manta Pacific” — not “Ethereum Mainnet” or “Sepolia”.

3. Initiate a swap between ETH and USDC.e; observe gas estimation in native Pacific units, not Gwei.

4. Approve the transaction using MetaMask’s signature prompt — ensure the recipient address matches the verified router contract.

5. Monitor confirmation status via the block explorer link embedded in the MetaMask transaction detail view.

Frequently Asked Questions

Q: Why does MetaMask show “Unknown Network” after adding Pacific?A: This occurs if the Chain ID was entered as text instead of integer, or if trailing whitespace exists in the RPC URL field. Re-enter 169 manually without quotes and trim all spaces from the RPC string.

Q: Can I use the same seed phrase for Manta Pacific and Ethereum Mainnet?A: Yes — MetaMask derives accounts deterministically across networks using the same BIP-39 mnemonic. No separate backup is required.

Q: Is there a native Pacific token I need to hold for gas?A: No — Manta Pacific uses ETH as its native gas token. All transactions require ETH balance in the selected account.

Q: Why does my transaction fail with “insufficient funds” even though ETH balance appears sufficient?A: The displayed balance may reflect pending inbound transfers. Wait for at least one confirmed block on Pacific before attempting outgoing transactions.