smart-accounts-kit

Quick Reference

This skill file provides quick access to the MetaMask Smart Accounts Kit v0.3.0. For detailed information, refer to the specific reference files.

📚 Detailed References:

• Smart Accounts Reference - Account creation, implementations, signers
• Delegations Reference - Delegation lifecycle, scopes, caveats
• Advanced Permissions Reference - ERC-7715 permissions via MetaMask

Package Installation

npm install @metamask/[email protected]

For custom caveat enforcers:

forge install metamask/[email protected]

Core Concepts Summary

1. Smart Accounts (ERC-4337)

Three implementation types:

• Hybrid (Implementation.Hybrid) - EOA + passkey signers
• Multisig (Implementation.MultiSig) - Multiple signers with threshold
• Stateless7702 (Implementation.Stateless7702) - EIP-7702 upgraded EOA

2. Delegation Framework (ERC-7710)

Grant permissions from delegator to delegate:

• Scopes - Initial authority (spending limits, function calls)
• Caveats - Restrictions enforced by smart contracts
• Types - Root, open root, redelegation, open redelegation
• Lifecycle - Create → Sign → Store → Redeem

3. Advanced Permissions (ERC-7715)

Request permissions via MetaMask extension:

• Human-readable UI confirmations
• ERC-20 and native token permissions
• Requires MetaMask Flask 13.5.0+
• User must have smart account

Quick Code Examples

Create Smart Account

import { Implementation, toMetaMaskSmartAccount } from '@metamask/smart-accounts-kit'
import { privateKeyToAccount } from 'viem/accounts'

const account = privateKeyToAccount('0x...')

const smartAccount = await toMetaMaskSmartAccount({
  client: publicClient,
  implementation: Implementation.Hybrid,
  deployParams: [account.address, [], [], []],
  deploySalt: '0x',
  signer: { account },
})

Create Delegation

import { createDelegation } from '@metamask/smart-accounts-kit'
import { parseUnits } from 'viem'

const delegation = createDelegation({
  to: delegateAddress,
  from: delegatorSmartAccount.address,
  environment: delegatorSmartAccount.environment,
  scope: {
    type: 'erc20TransferAmount',
    tokenAddress: '0x1c7D4B196Cb0C7B01d743Fbc6116a902379C7238',
    maxAmount: parseUnits('10', 6),
  },
  caveats: [
    { type: 'timestamp', afterThreshold: now, beforeThreshold: expiry },
    { type: 'limitedCalls', limit: 5 },
  ],
})

Sign Delegation

const signature = await smartAccount.signDelegation({ delegation })
const signedDelegation = { ...delegation, signature }

Redeem Delegation

import { createExecution, ExecutionMode } from '@metamask/smart-accounts-kit'
import { DelegationManager } from '@metamask/smart-accounts-kit/contracts'
import { encodeFunctionData, erc20Abi } from 'viem'