Extend the functionality of MetaMask using Snaps

note

Snaps is pre-release software.

Snaps is an open source system that allows anyone to safely extend the functionality of MetaMask, creating new web3 end user experiences.

Get started by installing Snaps.

What is a snap?

A snap is a JavaScript program run in an isolated environment that customizes the wallet experience. Snaps have access to a limited set of capabilities, determined by the permissions the user granted them during installation.

What can you do with a snap?

A snap can add new API methods to MetaMask, add support for different blockchain protocols, or modify existing functionalities using the Snaps JSON-RPC API.

For example, you can:

• Display a custom confirmation screen in MetaMask using snap_confirm.
• Notify users in MetaMask using snap_notify.
• Securely store and manage data on your device using snap_mangeState.
• Control non-EVM accounts and assets in MetaMask using snaps_getBip44Entropy.
• Populate MetaMask's pre-transaction window with custom transaction insights using onTransaction.
• Schedule periodic actions using onCronjob.

Questions?

If you have questions or want to propose a new feature, you can interact with the Snaps team and community on GitHub discussions.