ERC-4337 Overview · Application-Layer Implementation of Account Abstraction

Wiki route

This entry sits under systems index. Read it against ERC-7702 vs ERC-4337 · Ethereum AA dual-track comparison for peer / contrast context and fintech index for the broader system / regulatory boundary.

Key facts

• Enabled on Ethereum mainnet in 2023-03 ^•
• No protocol-layer change · implemented purely at the application layer ^•
• EntryPoint is an on-chain singleton contract (0x0000000071727De22E5E9d8BAf0edAc6f37da032) ^•
• The v0.7 upgrade (2026) simplified mempool rules · reduced gas overhead by 20-30% ^•
• Supports custom signatures such as WebAuthn / passkey / BLS / secp256r1 (iOS Secure Enclave) ^•

Mechanism / How it works

The core problem solved by ERC-4337 : the capability gap between EOA and SCW. A traditional EOA is controlled by a secp256k1 private key · can only send transactions / pay gas / sign · and has no programmable logic. SCW (Safe/Argent) is programmable, but it must be triggered by a tx issued by an EOA —— users still need to hold ETH to pay gas and manage private keys.

ERC-4337 introduces a new alternative transaction pool:

• UserOperation: an “intent” object signed by the user (not a transaction) · includes calldata / gas limits / paymaster information
• Bundler: similar to a block builder · takes items from the UserOp mempool, packages them into standard transaction 1 件, and sends them to EntryPoint
• EntryPoint: an on-chain singleton contract · verifies + executes all UserOps
• Paymaster: optional contract · pays gas on the user’s behalf (or accepts gas payment in ERC-20 )
• Aggregator: optional · batch-verifies multiple signatures (BLS / other methods)

Core innovation: UserOp is not a transaction · it is a sub-unit packaged into a transaction by a Bundler.

Origin & evolution

ERC-4337 was proposed in 2021 年 by Vitalik Buterin, Yoav Weiss, Kristof Gazso, and others · the original intent was to avoid the high barrier of “changing the Ethereum protocol layer” (earlier EIP-2938 and EIP-3074 both failed to reach mainnet). After mainnet activation in 2023-03 · progress exceeded expectations —— embedded wallet stacks such as Privy / Coinbase CDP / Alchemy integrated rapidly (contrast with Embedded-wallet network effects · the moat is in the integrator, not the wallet itself).

In 2026 年, the v0.7 upgrade simplified mempool rules · reduced gas overhead by 20-30% · and optimized the Bundler economic model. Around the same period, ERC-7702 (drafted by Vitalik from 2024-05 ) solved the problem of “upgrading existing EOA to SCW” from the opposite direction —— together they form complementary dual tracks.

Related

• Wiki Index
• UserOp/Bundler Flow
• Embedded Wallet Adoption
• ERC-7702 Overview · The Pectra Upgrade Where EOAs Temporarily Gain SCW Functionality

Sources

• ERC-4337 “Account Abstraction Using Alt Mempool” — https://eips.ethereum.org/EIPS/eip-4337