Create a custom mini app using Snaps

Snaps is an open source system that allows anyone to safely create a mini app that runs inside the MetaMask extension, enabling new web3 end user experiences. Get started building your own Snaps by installing MetaMask Flask.

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 API. Learn more in this video:

The following Snaps features are available in the stable version of MetaMask:

• Cron jobs

  Schedule periodic actions for your users.

• Custom EVM accounts

  Connect to custom EVM accounts in MetaMask.

• Custom name resolution

  Resolve names to addresses and vice versa.

• Custom UI

  Display custom UI in MetaMask using a set of pre-defined components.

• Data storage

  Store encrypted and unencrypted data within a Snap.

• Dialogs

  Display custom alert, confirmation, or prompt screens in MetaMask.

• Home pages

  Display a dedicated UI page in MetaMask for your Snap.

• Interactive UI

  Display interactive UI in MetaMask that can be updated dynamically.

• Lifecycle hooks

  Call an action when your Snap is installed or updated.

• Localization

  Translate your Snap UI based on the user's locale.

• Network access

  Access the internet using the fetch function.

• Non-EVM networks

  Manage non-EVM accounts and assets in MetaMask.

• Notifications

  Notify users directly in MetaMask, or natively in their OS.

• Signature insights

  Provide signature insights before a user signs a message.

• Static files

  Lazy-load static files such as Wasm modules or ZK circuits.

• Transaction insights

  Provide transaction insights in MetaMask's transaction confirmation window.

The following Snaps features are only available in MetaMask Flask, the canary distribution of MetaMask:

• Flask

  Account abstraction

  Connect to ERC-4337 accounts in MetaMask.

New to Snaps?

If you're new to Snaps, get started learning with the following topics:

• About Snaps

  See a high-level, technical overview of the Snaps system.

• About the Snaps APIs

  Learn about how Snaps, dapps, and MetaMask communicate with each other.

• Gas estimation Snap tutorial

  Follow an end-to-end tutorial to create a Snap that estimates gas fees.

• Snaps resources

  Learn and explore MetaMask Snaps with supplemental resources, tools, examples, and guides.

Questions?

If you have questions about using MetaMask Snaps or want to propose a new feature, you can interact with the MetaMask Snaps team and community on GitHub discussions and the mm-snaps-dev channel on Consensys Discord.

See the full list of Snaps resources for more information.

MetaMask user support

If you need MetaMask user support, visit the MetaMask Help Center.