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MetaMask developer documentation

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

Get Started

What do you want to build with MetaMask? Whether you're integrating with the extension, embedding smart wallets, or scaling with powerful infrastructure—choose a path below to get started.

Connect to MetaMask Extension or Mobile

Integrate your dapp with the MetaMask browser extension or MetaMask Mobile. Ideal for users who want full control over their keys and transactions.

MetaMask SDK

Use MetaMask SDK to provide your users a fast, reliable, and seamless connection to the MetaMask extension and MetaMask Mobile.

Wallet API

Use the Wallet API to directly connect your dapp to the MetaMask browser extension, and interact with your users' accounts.

Add an embedded MetaMask wallet

Enable embedded wallets and smart accounts directly within your dapp. Ideal for seamless onboarding, custom permission controls, and mobile-first, or first-time user experiences.

Delegation Toolkit

Use the Delegation Toolkit to integrate MetaMask smart accounts into your dapp. Create embedded wallets that support delegated permissions, gas abstraction, and secure execution.

Embedded Wallets SDK

Use the Embedded Wallets SDK to onboard power users and first-time users in seconds via social logins, passkeys, or by integrating your own authentication providers.

Extend MetaMask and scale your dapp

Extend MetaMask's capabilities and build scalable dapps with developer tools, hosted infrastructure, and customizable Snaps.

Snaps

Create a custom Snap to extend the functionality of MetaMask. Add support for custom networks, accounts types, and APIs.

Services

Use services provided by MetaMask and Infura to optimize essential development tasks and scale your dapp or Snap.

Contribute to MetaMask on GitHub

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

Contribute