Chainlist + MetaMask: The Easiest Way to Add Custom Networks

In the ever-expanding realm of blockchain technology, MetaMask stands as the premier crypto wallet for interacting with decentralized applications (dApps) and smart contracts. As the Web3 ecosystem grows, so does the number of EVM-compatible networks, including Ethereum, Polygon, BNB Chain, Arbitrum, and Avalanche. Managing these networks manually can be a complex task, but the integration of Chainlist with MetaMask revolutionizes the process. We deliver an exhaustive guide to adding custom networks to MetaMask using Chainlist, ensuring seamless connectivity for DeFi traders, NFT collectors, and blockchain developers alike. This article explores every nuance of the process, offering unparalleled detail to enhance your blockchain experience.

Understanding Chainlist and MetaMask Integration

Chainlist emerges as a vital resource, functioning as a centralized directory for EVM-compatible blockchain networks. Launched to simplify network management, it provides accurate details such as Chain IDs, RPC URLs, currency symbols, and block explorer links for over 385 networks as of mid-2025. This platform eliminates the guesswork involved in manually configuring MetaMask, which traditionally requires users to input network data with precision to avoid errors.

MetaMask, a widely adopted browser extension and mobile app, serves as the gateway to blockchain networks. Its ability to support custom network additions makes it indispensable, but the process demands technical accuracy. By leveraging Chainlist, we streamline this task, reducing the risk of connecting to unverified or fraudulent networks. This integration empowers users to explore Layer 2 solutions, sidechains, and testnets with confidence, enhancing participation in the Web3 space.

Essential Requirements Before Starting

Before proceeding, ensure the following prerequisites are met to add custom networks effectively:

  • MetaMask Installation: Install the MetaMask extension via https://metamask.io for browsers like Chrome, Firefox, Edge, or Brave, or download the MetaMask app from the iOS App Store or Google Play Store.
  • Configured Wallet: Set up a MetaMask wallet with a secure seed phrase and password, storing the phrase offline to safeguard digital assets.
  • Stable Internet: A reliable connection ensures smooth interaction with Chainlist and MetaMask.
  • Basic Technical Knowledge: Understanding RPC endpoints, Chain IDs, and network parameters facilitates a smoother experience.

With these foundations in place, we proceed to connect MetaMask to a vast array of custom networks using Chainlist.

Detailed Steps to Add Custom Networks Using Chainlist

We outline a meticulous, step-by-step process to add custom networks to MetaMask via Chainlist, catering to both desktop and mobile users.

Step 1: Access the Chainlist Platform

Navigate to the official Chainlist website at https://chainid.network using your preferred browser. The interface features a searchable database of EVM networks, updated regularly to reflect the latest blockchain additions. Bookmark the site to avoid phishing attempts, which often mimic legitimate URLs. The Chainlist homepage offers a clean layout with network filters and a search function.

Security Note: Confirm the URL is chainid.network or chainlist.org. Unauthorized sites may attempt to compromise your wallet security.

To initiate the network addition process:

  1. Click the “Connect Wallet” button located in the upper-right corner of the Chainlist homepage.
  2. Select MetaMask from the list of wallet options that appears.
  3. MetaMask prompts you to choose an account; select the desired one and click “Next”.
  4. Approve the connection by clicking “Connect” in the MetaMask pop-up.
  5. Your wallet address will display, confirming a successful connection.

Switch accounts by returning to MetaMask and reconnecting as needed.

Step 3: Locate the Custom Network

Chainlist simplifies finding custom networks with its robust search capabilities:

  1. Enter the network name (e.g., Polygon, Arbitrum, Goerli) or Chain ID (e.g., 137, 42161, 5) in the search bar.
  2. Scroll through the results or use filters like mainnets or testnets. Enable the “Include Testnets” option for development purposes.
  3. Review the network’s details, including Chain ID, RPC URL, and native currency, against official sources.

For instance, selecting BNB Chain reveals its Chain ID (56), RPC URL (https://bsc-dataseed.binance.org/), and currency (BNB).

Step 4: Integrate the Network into MetaMask

Add the selected network with these steps:

  1. Click the “Add Chain” or “Add to MetaMask” button next to the network.
  2. MetaMask displays a confirmation window with details such as:
  3. Verify the information and click “Approve” to proceed.
  4. Choose “Switch Network” to activate the network or “Close” to remain on the current one.

The network now appears in your MetaMask network list.

Step 5: Confirm Network Functionality

Validate the addition:

  1. Open MetaMask and select the new network from the network dropdown.
  2. Ensure it loads without errors.
  3. Visit the network’s block explorer (e.g., https://bscscan.com for BNB Chain) to confirm your address and transaction visibility.

Repeat the process if the network fails to appear.

Mobile Process for MetaMask Users

For MetaMask mobile app users:

  1. Launch the MetaMask app on your iOS or Android device.
  2. Tap the browser icon to open the in-app browser.
  3. Navigate to https://chainid.network.
  4. Follow the desktop steps: connect wallet, search network, and add via “Add Chain”.
  5. Approve and switch networks as prompted.

This ensures consistency across platforms.

Security Measures for Adding Custom Networks

Protecting your MetaMask wallet during network additions requires diligence:

  • Validate Network Data: Compare Chain IDs, RPC URLs, and block explorer links with official network documentation or trusted platforms like CoinGecko.
  • Stick to Official Sites: Access Chainlist only via chainid.network or chainlist.org. Avoid third-party links.
  • Investigate New Networks: For unlisted networks, review official websites, Twitter, and Discord communities before manual addition.
  • Track Transactions: Monitor your MetaMask activity using block explorers like Etherscan.
  • Secure Accounts: Enable 2FA on associated email or phone accounts.
  • Avoid Public Networks: Use private, secure internet connections.

These steps minimize risks and ensure a safe custom network integration.

Top Custom Networks to Add via Chainlist

Explore these popular custom networks and their applications:

  • Polygon (Chain ID: 137): A Layer 2 solution for low-cost DeFi and NFT creation. Currency: MATIC.
  • BNB Chain (Chain ID: 56): A high-performance chain for dApps and gaming. Currency: BNB.
  • Arbitrum (Chain ID: 42161): A Layer 2 rollup for fast transactions. Currency: ETH.
  • Avalanche C-Chain (Chain ID: 43114): A scalable platform for enterprise use. Currency: AVAX.
  • Goerli Testnet (Chain ID: 5): A test network for developers. Currency: GoETH.

Adding these networks via Chainlist expands your MetaMask utility.

Resolving Common Challenges

Address these frequent issues:

  • Network Not Displaying: Re-approve the addition or restart MetaMask. Check your connection.
  • Chain ID Mismatch: Remove and re-add the network with correct details.
  • Connection Issues: Clear cache, update MetaMask, or use an alternate RPC URL.
  • Suspicious Prompts: Disconnect and verify the Chainlist URL. Report to MetaMask support.
  • Testnet Token Shortage: Obtain tokens from official faucets.

Consult MetaMask Help Center (https://support.metamask.io) for further assistance.

Advanced Strategies for MetaMask and Chainlist

Enhance your experience with these techniques:

  • Custom RPC Endpoints: Add alternative RPC URLs from Infura or Alchemy via MetaMask Settings.
  • Multiple Network Additions: Add several testnets at once using “Include Testnets”.
  • Gas Fee Optimization: Use GasNow or Polygon Gas Station to monitor costs.
  • Asset Bridging: Transfer assets via Polygon Bridge or Arbitrum Bridge.
  • Wallet Backup: Export your seed phrase to a secure location.

These methods boost efficiency and flexibility.

The Future of Chainlist and MetaMask in 2025

With blockchain innovation accelerating, Chainlist and MetaMask remain essential. They enable access to emerging networks like zkSync, Linea, and Scroll, supporting DeFi, NFTs, and Web3 gaming. As adoption grows, mastering these tools ensures a competitive edge.

Conclusion

Adding custom networks to MetaMask using Chainlist offers a streamlined path to unlocking the Web3 ecosystem. Our detailed guide covers Polygon, BNB Chain, and beyond, with robust security and troubleshooting advice. Whether pursuing DeFi yields, NFT trading, or development, Chainlist and MetaMask deliver unparalleled connectivity. Explore more crypto insights at Tech Today and lead the blockchain revolution.