Wallet Integration

When to activate

• Connecting MetaMask/WalletConnect to a dApp frontend
• Implementing EIP-712 typed data signing
• Building transaction flows with gas estimation and confirmation
• Implementing account abstraction (ERC-4337) smart wallets
• Handling multi-chain wallet connections and chain switching

When NOT to use

• For custodial wallet management (exchange wallets)
• For server-to-server blockchain interactions
• For backend-only blockchain integrations

Instructions

1. Choose connection library. wagmi + viem (React), ethers.js (vanilla JS), web3modal (multi-wallet).
2. Implement connect flow. Detect injected provider → offer WalletConnect → handle rejection gracefully.
3. Chain management. Detect current chain, prompt to switch, add custom chains. Handle chain change events.
4. Transaction flow. Estimate gas → show confirmation UI → send transaction → poll for receipt → handle revert.
5. Message signing. EIP-191 (personal_sign) for auth, EIP-712 for structured data. Verify signatures server-side.
6. Account abstraction. Smart contract wallets (ERC-4337), gasless transactions (paymaster), social recovery.
7. Error handling. User rejected, insufficient funds, nonce too low, gas estimation failed, chain not supported.

Example

// wagmi + viem transaction flow
import { useWriteContract, useWaitForTransactionReceipt } from 'wagmi'

function MintButton() {
  const { writeContract, data: hash } = useWriteContract()
  const { isLoading, isSuccess } = useWaitForTransactionReceipt({ hash })

  const mint = () => writeContract({
    address: '0x1234...',
    abi: contractAbi,
    functionName: 'mint',
    args: [1],
    value: parseEther('0.01'),
  })

  return (
    <button disabled={isLoading}>
      {isLoading ? 'Minting...' : isSuccess ? 'Minted!' : 'Mint NFT'}
    </button>
  )
}