How to add Ethereum mainnet in MetaMask?

To use Ethereum-based dApps, add Ethereum Mainnet to your MetaMask wallet by inputting the correct RPC URL, Chain ID (1), currency symbol (ETH), and block explorer URL; verify all information for security.

Mar 15, 2025 at 03:30 pm

Key Points:

• MetaMask's default networks may not include Ethereum Mainnet; adding it is necessary for interacting with Ethereum-based dApps and tokens.
• The process involves navigating MetaMask's settings and adding a custom RPC network with specific Ethereum Mainnet parameters.
• Ensuring correct network parameters is crucial to avoid connection errors and transaction failures.
• Security best practices, like verifying the source of network information, are vital to prevent scams.

How to Add Ethereum Mainnet in MetaMask?

MetaMask, a popular browser extension wallet, simplifies interacting with decentralized applications (dApps). While it often defaults to networks like the Goerli testnet, you'll need to add the Ethereum Mainnet to access the primary Ethereum blockchain and its ecosystem. This guide details the process.

First, ensure you have the latest version of MetaMask installed in your browser. Outdated versions might lack necessary features or have security vulnerabilities. Regular updates are highly recommended for a smooth and secure experience.

Next, open MetaMask and click on the network selection dropdown, usually located in the top right corner. You'll see a list of available networks. If "Ethereum Mainnet" is absent, you'll need to add it manually.

To add the Ethereum Mainnet, click on "Add Network." MetaMask will present a form requesting specific network details. Inputting the incorrect information will prevent you from connecting to the mainnet.

• Network Name: Ethereum Mainnet
• New RPC URL: This is crucial. A reliable source for this is essential. Use a well-known and reputable source for the RPC URL. Incorrect URLs can lead to scams or connection failures. Examples include https://mainnet.infura.io/v3/[YOUR_INFURA_PROJECT_ID] (replace [YOUR_INFURA_PROJECT_ID] with your Infura project ID), or similar URLs from other reputable providers.
• Chain ID: 1 (This is the unique identifier for the Ethereum Mainnet)
• Currency Symbol: ETH
• Block Explorer URL: https://etherscan.io (or another reputable Ethereum block explorer)

Double-check all the information you entered. A single incorrect character can prevent successful connection. Once confident, click "Save." MetaMask will now add the Ethereum Mainnet to your available networks. You should see "Ethereum Mainnet" in your network selection dropdown.

Remember, the security of your funds depends on the accuracy and legitimacy of the information used. Always verify the source of the RPC URL before using it. Using an unreliable source could expose your wallet to malicious actors.

Switching between networks is straightforward. Simply select the desired network from the dropdown menu in MetaMask. This allows seamless interaction between testnets for development and the mainnet for live transactions. Remember to always confirm the selected network before any transactions to avoid sending funds to the wrong network.

Adding a custom network is a powerful feature, but it carries a risk if not handled carefully. Always use reliable sources for network parameters and be wary of unfamiliar or suspicious URLs. If unsure, consult reputable guides or the official MetaMask support channels.

This process is similar for other networks, just remember to replace the parameters with those specific to the network you want to add. For instance, adding the Polygon network would require different RPC URL, Chain ID, and explorer URL. Always verify this information before proceeding.

Incorrectly adding a network can result in irreversible loss of funds. Double-check every detail before saving. If you encounter issues, ensure your MetaMask is updated and consult their official support documentation.

Frequently Asked Questions:

Q: What happens if I enter the wrong information when adding the Ethereum Mainnet?

A: Entering incorrect network parameters will prevent you from connecting to the Ethereum Mainnet. You might encounter errors when trying to send or receive ETH or interact with dApps. You'll need to remove the incorrectly added network and try again with the correct information.

Q: Where can I find a reliable RPC URL for the Ethereum Mainnet?

A: Reputable providers like Infura, Alchemy, and QuickNode offer free and paid RPC services. Always check the provider's legitimacy before using their URL. Avoid using RPC URLs from unknown or untrusted sources.

Q: Why is it important to use the correct Chain ID?

A: The Chain ID uniquely identifies a blockchain network. An incorrect Chain ID will prevent transactions from being processed correctly, potentially leading to loss of funds. It's a crucial parameter for ensuring compatibility with the target network.

Q: My transaction failed after adding the Ethereum Mainnet. What should I do?

A: First, verify that you're on the correct Ethereum Mainnet. Double-check the network selection in MetaMask. If you are, check the transaction details for any error messages. If the problem persists, consult the relevant dApp's documentation or support channels.

Q: Is it safe to add custom networks to MetaMask?

A: Adding custom networks is generally safe if you obtain network parameters from trusted sources. However, using unreliable sources for RPC URLs or other parameters can expose your wallet to risks. Always exercise caution and verify the legitimacy of your information sources.