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MetaMask developer documentation

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

Wallet

Integrate with MetaMask Wallet

Interact with your users' via the MetaMask Wallet API.
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SDK

Build on chain apps

Authenticate users, handle transactions, interact with contracts, and more.
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Snaps

Extend the functionality of MetaMask

Extend the functionality with custom networks, account types, APIs, and more.
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Contribute to MetaMask

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

Contribute