Overview

What is EIP-7702?

EIP-7702 is a proposal to introduce a new transaction type (SET_CODE_TX_TYPE, 0x04) that allows externally owned accounts (EOAs) to temporarily or permanently delegate their behavior to a smart contract, effectively turning any EOA into a smart account. This is achieved by letting an EOA specify a delegation designator-a special code pointing to a smart contract implementation. When active, any transaction sent to the EOA will execute the code at the designated contract address, but the EOA's address remains the msg.sender.

"EIP-7702 enables EOAs to delegate control to smart contract accounts that can execute code directly from their addresses. It is compatible with the prevailing AA standard, ERC-4337, so existing wallets can become smart contract wallets without creating a new address and transferring assets."

• Alchemy

Key Features & Use Cases

• Transaction Batching: Combine multiple operations (e.g., token approval + swap) into a single atomic transaction, improving UX and reducing gas costs.
• Gas Sponsorship: Allow third parties or apps to pay transaction fees for users, or enable users to pay gas in ERC-20 tokens instead of ETH.
• Permission Management: Assign sub-keys with restricted capabilities (e.g., only interact with certain dApps, limit spending to a daily quota, etc.).
• Session Keys & Account Recovery: Enable temporary session keys for smoother dApp interactions and easier account recovery flows.
• Seamless Migration Path: Unlike previous proposals, EIP-7702 is fully compatible with ERC-4337, enabling existing EOAs to gain smart wallet features without changing addresses or migrating assets.

How Does EIP-7702 Work?

• The EOA signs a special authorization message to delegate execution to a smart contract.
• This authorization is included in a transaction, updating the EOA's delegation designator (0xef0100 || address).
• As long as the delegation is active, transactions to the EOA execute the smart contract code at the specified address.
• To revoke, the user sends another EIP-7702 transaction to reset the delegation.

Security Considerations

• Entrusted Contract Security: The smart contract code must be thoroughly audited to prevent vulnerabilities.
• Signature Verification: Correctly verify user signatures to avoid unauthorized actions.
• Replay Protection: Implement nonce or other mechanisms to prevent replay attacks.

Timeline

Why Does EIP-7702 Matter?

EIP-7702 represents a major step toward Ethereum's vision of account abstraction, making onchain experiences more flexible, user-friendly, and secure. By bridging EOAs and smart contract accounts, it enables powerful new features-batching, gas sponsorship, permissioned keys-without requiring users to migrate wallets or assets.

Further Reading