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MetaMask developer documentation

Build with the world's leading self-custodial crypto wallet.

What do you want to do with MetaMask?

Connect to MetaMask

Connect your dapp to the MetaMask browser extension and mobile app. Interact with users' accounts across multichain, EVM, or Solana networks using a single integration.

Create embedded wallets

Onboard users to your dapp via social logins, or by integrating your own authentication providers. No seed phrases required.

Upgrade to smart accounts

Create and interact with MetaMask Smart Accounts, unlocking new programmable account behaviors and granular permission sharing.

Make Agent Wallets

Give AI agents programmatic wallet access via the MetaMask Agent Wallet CLI. Transfer, swap, trade, and sign with mandatory security on every transaction.

Build and scale your dapp

Use high performance APIs provided by MetaMask and Infura to build and scale your dapp or Snap.

Extend MetaMask

Create a custom mini app (Snap) that runs inside the MetaMask extension. Add support for custom networks, account types, and APIs.

Contribute to MetaMask on GitHub

Join the MetaMask developer community and learn how to contribute to the MetaMask project itself.

Contribute