ARCIPEDIA · WALLET · SOFTWARE

Plain English

MetaMask is the most-used self-custody wallet for Ethereum and EVM chains. Browser extension and mobile app. Created by ConsenSys in 2016. Over 30 million monthly users. Default entry point for DeFi for most people.

How it actually works

Stores private keys locally encrypted with your password; never sends keys to ConsenSys servers. Supports all EVM chains (Ethereum, Arbitrum, Optimism, Base, Polygon, BNB, Avalanche, etc.) via custom RPC. Built-in token swap aggregator charges 0.875% fee. Snaps system extends MetaMask to non-EVM chains (Bitcoin, Solana, Starknet via third-party Snaps).

What it means for you

MetaMask is the default for first-time DeFi users. Reasonable security if you protect the seed phrase. Built-in swap is convenient but expensive — for trades >$1K, use a DEX aggregator (1inch, CowSwap, Odos) directly to save on fees. Pair MetaMask with a hardware wallet (Ledger, Trezor) for material balances — gives DeFi convenience plus cold-storage security.

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Educational content only. Not investment, tax, or legal advice.