How to add Sei network to MetaMask?

Network Configuration Steps

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

2. Select “Add Network” from the dropdown menu to initiate manual chain setup.

3. Click “Add a network manually” and prepare to input Sei-specific parameters.

4. Enter “Sei” as the Network Name in the designated field.

5. Paste https://rpc.sei-protocol.io into the New RPC URL field.

6. Input 1329 as the Chain ID—this is the official identifier for Sei mainnet.

7. Set Currency Symbol to SEI without altering case or spacing.

8. Provide https://sei.explorers.guru as the Block Explorer URL for on-chain verification.

Wallet Connection Verification

1. After saving the configuration, MetaMask will automatically switch to the Sei network.

2. Confirm the network name appears as “Sei” in the top-left corner with no warning icons.

3. Visit https://app.sei.io and click “Connect Wallet” to trigger MetaMask injection.

4. Approve the connection request within the MetaMask popup window.

5. Observe that the dApp displays your Sei wallet address and correctly reflects balance status.

6. Attempt signing a test transaction—such as approving a token allowance—to validate signature flow.

RPC Node Redundancy Setup

1. Navigate to MetaMask Settings → Networks → Sei → Edit.

2. Scroll down to “Additional RPC URLs” and click “Add another RPC URL”.

3. Insert https://sei-rpc.polkachu.com as a backup endpoint.

4. Add https://sei-json-rpc.publicnode.com as a secondary fallback node.

5. Save changes and restart MetaMask to ensure all endpoints register correctly.

6. Monitor transaction confirmations during high-throughput periods to assess node reliability.

Token Import Protocol

1. Within MetaMask, click “Import Tokens” under the Assets tab.

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

3. Paste 0x1111111111111111111111111111111111111111—the canonical SEI token address on Sei mainnet.

4. MetaMask will auto-populate Token Symbol as “SEI” and Decimals as “18”.

5. Click “Next”, then “Add Tokens” to finalize asset visibility.

6. Verify the SEI balance appears under Assets and updates in real time after transfers.

Frequently Asked Questions

Q: Why does MetaMask show “Unknown Network” after adding Sei?A: This occurs when Chain ID 1329 is entered incorrectly—common mistakes include using “13290”, “0x1329”, or omitting leading zeros in decimal format. Re-enter the exact integer value without prefixes or suffixes.

Q: Can I use the same Sei RPC endpoint across multiple wallets?A: Yes. The endpoint https://rpc.sei-protocol.io is publicly accessible and supports concurrent connections from MetaMask, Trust Wallet, and Phantom without rate limiting.

Q: Is the SEI token address the same on both mainnet and testnet?A: No. The mainnet address is 0x1111111111111111111111111111111111111111. The testnet uses 0x9999999999999999999999999999999999999999 and must never be imported into mainnet contexts.

Q: What happens if I send ETH to my Sei wallet address?A: ETH sent to a Sei-addressed wallet is irretrievably lost. Sei operates its own native token economy and does not support Ethereum’s ETH on its execution layer. Only SEI tokens are valid on this chain.