What blockchains does MetaMask support?

Understanding the Blockchain Compatibility of MetaMask

MetaMask is one of the most widely used cryptocurrency wallets, especially among users interacting with decentralized applications (dApps) on various blockchain networks. The wallet supports a broad range of blockchains, allowing users to manage assets across multiple ecosystems seamlessly.

MetaMask supports Ethereum and its layer-2 solutions as primary networks. These include well-known chains such as Ethereum Mainnet, Optimism, Arbitrum, and Base. Additionally, it integrates with popular sidechains like Polygon (Matic) and Gnosis Chain, which are often used for lower transaction fees and faster processing times.

Adding Custom Networks in MetaMask

While MetaMask comes preloaded with several major blockchains, it also allows users to manually add other networks that aren't included by default. This feature makes it highly flexible for developers and advanced users who work on niche or newly launched chains.

To add a custom network:

• Open MetaMask and click on the network dropdown at the top.
• Select 'Add Network.'
• Choose 'Add a network manually' or use a known RPC provider if available.
• Enter the required details: Network Name, New RPC URL, Chain ID, Currency Symbol, and optionally a Block Explorer URL.
• Click 'Save' to confirm and switch to the new network.

EVM-Compatible Chains Supported by MetaMask

Since MetaMask is built to interact with the Ethereum Virtual Machine (EVM), it inherently supports any EVM-compatible blockchain. This includes not only Ethereum itself but also forks and alternative chains that follow the same execution environment standards.

Some prominent EVM-compatible chains supported include:

• Binance Smart Chain (BSC): Known for its low gas fees and fast transactions.
• Avalanche C-Chain: Offers high throughput and sub-second finality.
• Fantom: Designed for scalability and speed using an aBFT consensus mechanism.
• Celo: Focuses on financial inclusion and mobile-first accessibility.
• Moonbeam: A Polkadot-based EVM chain offering cross-chain interoperability.

Connecting to Non-EVM Blockchains via External Providers

Although MetaMask natively supports EVM-compatible chains, it does not directly support non-EVM blockchains like Solana, Cosmos, or Bitcoin. However, developers have created external tools and integrations that allow limited interaction with these networks through dApps or wallet adapters.

For example:

• Phantom Wallet can be used alongside MetaMask for Solana-based dApps.
• Keplr Wallet offers integration with Cosmos-based chains through browser extensions.
• XDEFI Wallet supports multi-chain environments including Bitcoin, Solana, and Terra.

How Developers Can Deploy Contracts Across Multiple Chains Using MetaMask

MetaMask's support for multiple chains makes it ideal for developers deploying smart contracts on different networks. When using development frameworks like Hardhat or Truffle, developers can configure deployment scripts to interact with various RPC endpoints connected to MetaMask.

Steps to deploy contracts on multiple chains:

• Set up a project using Hardhat or Truffle and install necessary plugins.
• Configure networks in the hardhat.config.js file with RPC URLs and chain IDs for each target blockchain.
• Use the signer object from MetaMask to send transactions after connecting the wallet to the desired network.
• Deploy the contract and verify it using the respective chain’s block explorer.

Frequently Asked Questions

Can I use MetaMask with Cardano?MetaMask does not support Cardano natively since it is not EVM-compatible. You will need to use a dedicated wallet like Daedalus or Yoroi for Cardano interactions.

Is it safe to add custom RPC networks to MetaMask?Yes, it is safe as long as you ensure the RPC provider is trustworthy and secure. Always double-check the Chain ID and RPC URL before adding a network.

Does MetaMask support Layer 3 protocols?Currently, MetaMask supports Layer 2 scaling solutions that are EVM-compatible. Layer 3 protocols are still emerging, and support depends on whether they maintain EVM compatibility.

Can I switch between multiple blockchains in MetaMask easily?Yes, MetaMask provides a simple interface where you can select and switch between supported blockchains using the network dropdown menu.