EIP-4337 - Polygon Developer Docs

The ERC-4337 standard, also known as EIP-4337, allows developers to achieve account abstraction on the Polygon Chain. This page provides a simplified overview of the different components of ERC-4337 and how they work together. The ERC-4337 standard consists of four main components: UserOperation, Bundler, EntryPoint, and Contract Account. Optional components include Paymasters and Aggregators.

Building ERC-4337 transactions

ERC-4337 transactions are called UserOperations to avoid confusion with the regular transaction type. UserOperations are pseudo-transaction objects that are used to execute transactions with contract accounts. ERC-4337 transactions have to be sent to nodes that include ERC-4337 bundlers. The UserOperation object has a few fields.

Field	Type	Description
`sender`	`address`	The address of the smart contract account
`nonce`	`uint256`	Anti-replay protection
`initCode`	`bytes`	Code used to deploy the account if not yet onchain
`callData`	`bytes`	Data that’s passed to the `sender` for execution
`callGasLimit`	`uint256`	Gas limit for execution phase
`verificationGasLimit`	`uint256`	Gas limit for verification phase
`preVerificationGas`	`uint256`	Gas to compensate the bundler
`maxFeePerGas`	`uint256`	Similar to EIP-1559 max fee
`maxPriorityFeePerGas`	`uint256`	Similar to EIP-1559 priority fee
`paymasterAndData`	`bytes`	`Paymaster Contract` address and any extra data required for verification and execution
`signature`	`bytes`	Used to validate a `UserOperation` along with the `nonce` during verification

ERC-4337 wallets

Users must have an ERC-4337 smart contract account to validate UserOperations. The core interface for an ERC-4337 wallet is:

interface IAccount {
  function validateUserOp
      (UserOperation calldata userOp, bytes32 userOpHash, address aggregator, uint256 missingAccountFunds)
      external returns (uint256 sigTimeRange);
}

Resources

ERC-4337 proposal is the link to the official proposal and technical specification.
@account-abstraction SDK is an npm package for using ERC-4337 developed by the authors of the proposal.
Stackup provides node services with ERC-4337 bundlers and other ERC-4337 infrastructure.
WalletKit is an all-in-one platform for adding smart, gasless wallets to your app. It has integrated support for ERC-4337 and comes with a paymaster and bundler included, requiring no extra setup.

​Building ERC-4337 transactions

​ERC-4337 wallets

​Resources

Building ERC-4337 transactions

ERC-4337 wallets

Resources