MetaMask

MetaMask is a self-custodial cryptocurrency wallet available as a browser extension and mobile app, enabling users to securely hold private keys locally, manage onchain assets, and connect to decentralized applications (dApps).[1]

It supports a wide range of blockchains, including Ethereum Virtual Machine (EVM) networks like Arbitrum, Optimism, Polygon, Base, Avalanche, and BNB Smart Chain, as well as Bitcoin, Solana, Tron, Sei, and Monad through a multichain account structure that groups addresses across networks under one label.[1][2] Users can handle token standards such as ERC-20, ERC-721, ERC-1155, and SPL, perform transaction signing for token transfers and smart contract interactions, and configure custom RPC endpoints for compatible chains.[1]

Key features include built-in swap and bridge aggregation with a transparent 0.875% fee, hardware wallet integration like Ledger, and security tools such as simulation alerts, phishing blocklists, and integrated anti-scam protections.[1] The wallet offers multichain compatibility with hundreds of embedded mini-apps for gaming, yield farming, and prediction markets, plus gas fee abstraction to pay transaction fees with various tokens.[2]

MetaMask Card provides a self-custodial debit card option linked directly to the wallet, allowing spending of crypto like mUSD, USDC, USDT, wETH, and others at over 150 million Mastercard merchants worldwide via Apple Pay, Google Pay, or physical card, with users retaining control of assets until purchase.[3][4][5] Standard cardholders earn 1% cashback in mUSD, while the premium Metal Card offers up to 3% on initial spending, no foreign transaction fees, and additional perks.[3][5]

Additional capabilities encompass NFC tap-to-pay, encrypted messaging via XMTP, AI agent integrations, and access to tokenized assets like U.S. stocks and ETFs through partnerships, all while maintaining user privacy and self-control without requiring centralized accounts.[2]

Website: metamask.io

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