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Standards · medium

22. ERC-4337 Account Abstraction

Smart contract wallets, UserOperations, and Paymasters.

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ERC-4337 enables smart contract accounts without consensus-layer protocol changes. Users sign `UserOperation` structs instead of transactions. Bundlers package UserOps into an `EntryPoint` contract, and `Paymaster` contracts can sponsor user gas fees (gasless UX) or accept ERC-20 tokens for gas.

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  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
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  4. 4. Read every explanation, even for the answers you got right.

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Check your understanding

  1. 1. What entity bundles UserOperations and submits them on-chain in ERC-4337?

  2. 2. What role does a Paymaster contract perform in Account Abstraction?

  3. 3. What contract acts as the central coordinator in ERC-4337?

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