ERC-4337

GetBlock ERC-4337 Methods: access bundler RPC calls for smart accounts, so gasless and batched transactions work without your own UserOperation relay.

This add-on adds the account-abstraction methods. Account abstraction lets a smart contract act as a wallet, enabling transactions without native ETH for gas, third-party gas sponsorship, and custom validation logic.

Account abstraction does not change the base protocol. It works through a separate transaction-like object, the UserOperation, and a set of off-chain roles that process it. The geth and reth clients do not know about UserOperations, so they cannot serve the ERC-4337 methods on their own.

To close that gap, GetBlock runs a bundler as a sidecar next to your node. The bundler is the component that understands UserOperations. It exposes the full ERC-4337 RPC to your client and settles the operations on-chain through the EntryPoint contract.

How a UserOperation flows

A UserOperation describes an action for a smart-contract wallet. Your client submits it to the bundler rather than to the chain directly. The bundler validates it, holds it in its own mempool, groups several operations together, and submits the bundle to the EntryPoint contract, which executes each one against its target wallet.

The methods

Method	Purpose
eth_sendUserOperation	Submit a UserOperation to the bundler mempool
eth_estimateUserOperationGas	Estimate the gas a UserOperation needs
eth_getUserOperationByHash	Fetch a UserOperation by its hash
eth_getUserOperationReceipt	Get the receipt for a UserOperation
eth_supportedEntryPoints	List the EntryPoint contracts the bundler supports

Benefits

• Native ERC-4337 support: You get the full account-abstraction RPC on a node that does not provide it by default.

• Gasless transactions: With a paymaster, your users transact without holding native ETH, because the paymaster sponsors the gas.

• No bundler to run: You build on smart-contract wallets without operating and maintaining your own bundler.

When to use it

• You build a product around smart-contract wallets.

• You run a paymaster or a gas-sponsorship flow.

• You build account-abstraction infrastructure and need a reliable bundler RPC.