Skip to main content

MetaMask developer documentation

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

SDK
Use MetaMask SDK to build onchain dapps. Authenticate users, handle transactions, and interact with contracts across the MetaMask extension and MetaMask Mobile.
Wallet API
Use the Wallet API to integrate your dapp with MetaMask. Connect to the MetaMask browser extension and interact with your users' accounts.
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.