Bundler

A Bundler is a class to an ERC-4337 Bundler JSON-RPC API methods such as estimating user operation gas, and sending user operations.

The Bundler class sets up a Bundler Instance with a Bundler RPC URL.

Usage

Import

import { Bundler } from "abstractionkit";

How to use

Initialize a Bundler with your desired bundler RPC url

const bundlerRPC = "https://sepolia.voltaire.candidewallet.com/rpc";

const bundler: Bundler = new Bundler(bundlerRPC);

Then you can consume Bundler methods:

const entrypointAddresses = await bundler.supportedEntryPoints();

Paramaters

bundlerURL `string`

Methods

chainId

Returns chain ID of the current network that the bundler is operating in

Usage

example.ts
Return Type

example.ts
import { Bundler } from "abstractionkit";

const bundlerRPC = "https://sepolia.voltaire.candidewallet.com/rpc";
const bundler: Bundler = new Bundler(bundlerRPC);
const getChainId = await bundler.chainId();

key	type	description
`chainId`	`Promise<string>`	Target ChainId of the Bundler URL used

Example Response

0xaa36a7

JSON-RPC Method

eth_chainId

supportedEntryPoints

Returns the list of the entryPoint addresses supported by the bundler

Usage

example.ts
Return Type

example.ts
import { Bundler } from "abstractionkit";

const bundlerRPC = "https://sepolia.voltaire.candidewallet.com/rpc";
const bundler: Bundler = new Bundler(bundlerRPC);
const entrypointAddresses = await bundler.supportedEntryPoints();

key	type	description
`entrypoint addresses`	`Promise<string[]>`	Support EntryPoints by the Bundler

Example Response

[
  '0x0000000071727De22E5E9d8BAf0edAc6f37da032',
  '0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789'
]

JSON-RPC Method

eth_supportedEntryPoints

estimateUserOperationGas

Generates and returns an estimate of how much gas is necessary to allow the user operation to complete, given a UserOperations.

Usage

See a full example in getting-started guide

example.ts
Param Type
Return Type

example.ts
import { Bundler, UserOperationV7 } from "abstractionkit";

const bundlerRPC = "https://sepolia.voltaire.candidewallet.com/rpc";
const bundler: Bundler = new Bundler(bundlerRPC);

// Use createUserOperation() to help you construct the userOp below
const userOperation = smartAccount.createUserOperation(..)
const entryPointAddress = "0x0000000071727De22E5E9d8BAf0edAc6f37da032";

const estimation = await bundler.estimateUserOperationGas(userOperation, entryPointAddress);

key	type	description
`userOperation`	`UserOperationV6 \| UserOperationV7`	Supports both UserOperations Type on EntryPoint v0.6 and v0.7
`entrypoint address`	`string`	Target EntryPoint

UserOperationV7

key	type	description
`sender`	`string`	The account making the operation
`nonce`	`string`	Anti-replay parameter (see “Semi-abstracted Nonce Support” )
`factory`	`string`	account factory, only for new accounts
`factoryData`	`string`	data for account factory (only if account factory exists)
`callData`	`string`	The data to pass to the sender during the main execution call
`callGasLimit`	`bigint`	The amount of gas to allocate the main execution call
`verificationGasLimit`	`bigint`	The amount of gas to allocate for the verification step
`preVerificationGas`	`bigint`	Extra gas to pay the bunder
`maxFeePerGas`	`bigint`	Maximum fee per gas (similar to EIP-1559 max_fee_per_gas)
`maxPriorityFeePerGas`	`bigint`	Maximum priority fee per gas (similar to EIP-1559 max_priority_fee_per_gas)
`paymaster`	`string`	Address of paymaster contract, (or empty, if account pays for itself)
`paymasterVerificationGasLimit`	`string`	The amount of gas to allocate for the paymaster post-operation code
`paymasterPostOpGasLimit`	`string`	The amount of gas to allocate for the paymaster post-operation code
`paymasterData`	`string`	Data for paymaster (only if paymaster exists)
`signature`	`string`	Data passed into the account to verify authorization

UserOperationV6

key	type	description
`sender`	`string`	The account making the operation
`nonce`	`string`	Anti-replay parameter (see “Semi-abstracted Nonce Support” )
`initCode`	`string`	The initCode of the account (needed if and only if the account is not yet on-chain and needs to be created)
`callData`	`string`	The data to pass to the sender during the main execution call
`callGasLimit`	`bigint`	The amount of gas to allocate the main execution call
`verificationGasLimit`	`bigint`	The amount of gas to allocate for the verification step
`preVerificationGas`	`bigint`	The amount of gas to pay for to compensate the bundler for pre-verification execution and calldata
`maxFeePerGas`	`bigint`	Maximum fee per gas (similar to EIP-1559 max_fee_per_gas)
`maxPriorityFeePerGas`	`bigint`	Maximum priority fee per gas (similar to EIP-1559 max_priority_fee_per_gas)
`paymasterAndData`	`string`	Address of paymaster sponsoring the transaction, followed by extra data to send to the paymaster (empty for self-sponsored transaction). Revolves to '0x' if not using a paymaster, and a paymasterDummyData when estimating gas
`signature`	`string`	The signature for the userOperation. It is the data passed into the account along with the nonce during the verification step. Resolves to '0x' when the user did not provide their signature yet

key	type	description
`callGasLimit`	`bigint`	The amount of gas to allocate the main execution call
`verificationGasLimit`	`bigint`	The amount of gas to allocate for the verification step
`preVerificationGas`	`bigint`	The amount of gas to pay for to compensate the bundler for pre-verification execution and calldata

Example Response

{
  callGasLimit: 58588n,
  preVerificationGas: 45628n,
  verificationGasLimit: 94374n
}

JSON-RPC Method

eth_estimateUserOperationGas

sendUserOperation

Asks the bundler to sign and submit a User Operation

Usage

See a full example in getting-started guide

example.ts
Param Type
Return Type

example.ts
import { Bundler } from "abstractionkit";

const bundlerRPC = "https://sepolia.voltaire.candidewallet.com/rpc";
const bundler: Bundler = new Bundler(bundlerRPC);
const entrypointAddress = "0x0000000071727De22E5E9d8BAf0edAc6f37da032";
// Use createUserOperation() to help you construct the userOp below
const userOperation = smartAccount.createUserOperation(..)

const userOperationHash = await bundler.sendUserOperation(userOperation, entrypointAddress);

key	type	description
`userOperation`	`UserOperationV6 \| UserOperationV7`	Supports both UserOperations Type on EntryPoint v0.6 and v0.7
`entrypoint address`	`string`	Target EntryPoint

UserOperationV7

key	type	description
`sender`	`string`	The account making the operation
`nonce`	`string`	Anti-replay parameter (see “Semi-abstracted Nonce Support” )
`factory`	`string`	account factory, only for new accounts
`factoryData`	`string`	data for account factory (only if account factory exists)
`callData`	`string`	The data to pass to the sender during the main execution call
`callGasLimit`	`bigint`	The amount of gas to allocate the main execution call
`verificationGasLimit`	`bigint`	The amount of gas to allocate for the verification step
`preVerificationGas`	`bigint`	Extra gas to pay the bunder
`maxFeePerGas`	`bigint`	Maximum fee per gas (similar to EIP-1559 max_fee_per_gas)
`maxPriorityFeePerGas`	`bigint`	Maximum priority fee per gas (similar to EIP-1559 max_priority_fee_per_gas)
`paymaster`	`string`	Address of paymaster contract, (or empty, if account pays for itself)
`paymasterVerificationGasLimit`	`string`	The amount of gas to allocate for the paymaster post-operation code
`paymasterPostOpGasLimit`	`string`	The amount of gas to allocate for the paymaster post-operation code
`paymasterData`	`string`	Data for paymaster (only if paymaster exists)
`signature`	`string`	Data passed into the account to verify authorization

UserOperationV6

key	type	description
`sender`	`string`	The account making the operation
`nonce`	`string`	Anti-replay parameter (see “Semi-abstracted Nonce Support” )
`initCode`	`string`	The initCode of the account (needed if and only if the account is not yet on-chain and needs to be created)
`callData`	`string`	The data to pass to the sender during the main execution call
`callGasLimit`	`bigint`	The amount of gas to allocate the main execution call
`verificationGasLimit`	`bigint`	The amount of gas to allocate for the verification step
`preVerificationGas`	`bigint`	The amount of gas to pay for to compensate the bundler for pre-verification execution and calldata
`maxFeePerGas`	`bigint`	Maximum fee per gas (similar to EIP-1559 max_fee_per_gas)
`maxPriorityFeePerGas`	`bigint`	Maximum priority fee per gas (similar to EIP-1559 max_priority_fee_per_gas)
`paymasterAndData`	`string`	Address of paymaster sponsoring the transaction, followed by extra data to send to the paymaster (empty for self-sponsored transaction). Revolves to '0x' if not using a paymaster, and a paymasterDummyData when estimating gas
`signature`	`string`	The signature for the userOperation. It is the data passed into the account along with the nonce during the verification step. Resolves to '0x' when the user did not provide their signature yet

key	type	description
`userOpHash`	`string`	UserOperation Hash

Example Response

'0x0ff052095987556f476c6e6b7cdff65cc6191d2cede50a109fe6977c3287fc9a'

JSON-RPC Method

eth_sendUserOperation

getUserOperationByHash

Returns a UserOperation by its hash returned from sendUserOperation

Usage

example.ts
Param Type
Return Type

example.ts
import { Bundler } from "abstractionkit";

const bundlerRPC = "https://sepolia.voltaire.candidewallet.com/rpc";
const bundler: Bundler = new Bundler(bundlerRPC);
const userOperationHash = "0xb348b32bc9b9e90620839c3926db401558806b03b2a46dc6de21d3a4ed8412fb";

const userOperation = await bundler.getUserOperationByHash(userOperationHash);

key	type	description
`userOpHash`	`string`	UserOperation Hash

key	type	description
`userOperation`	`UserOperationV6 \| UserOperationV7`	The user operation object, which can be either version 6 or version 7, depending on the entry point version used.
`entryPoint`	`string`	The address of the entry point contract associated with the user operation.
`blockNumber`	`bigint \| null`	The block number in which the user operation was included, or null if it hasn't been included yet.
`blockHash`	`string \| null`	The hash of the block containing the user operation, or null if it hasn't been included yet.
`transactionHash`	`string \| null`	The transaction hash associated with the user operation, or null if it hasn't been included yet.

UserOperationV7

key	type	description
`sender`	`string`	The account making the operation
`nonce`	`string`	Anti-replay parameter (see “Semi-abstracted Nonce Support” )
`factory`	`string`	account factory, only for new accounts
`factoryData`	`string`	data for account factory (only if account factory exists)
`callData`	`string`	The data to pass to the sender during the main execution call
`callGasLimit`	`bigint`	The amount of gas to allocate the main execution call
`verificationGasLimit`	`bigint`	The amount of gas to allocate for the verification step
`preVerificationGas`	`bigint`	Extra gas to pay the bunder
`maxFeePerGas`	`bigint`	Maximum fee per gas (similar to EIP-1559 max_fee_per_gas)
`maxPriorityFeePerGas`	`bigint`	Maximum priority fee per gas (similar to EIP-1559 max_priority_fee_per_gas)
`paymaster`	`string`	Address of paymaster contract, (or empty, if account pays for itself)
`paymasterVerificationGasLimit`	`string`	The amount of gas to allocate for the paymaster post-operation code
`paymasterPostOpGasLimit`	`string`	The amount of gas to allocate for the paymaster post-operation code
`paymasterData`	`string`	Data for paymaster (only if paymaster exists)
`signature`	`string`	Data passed into the account to verify authorization

UserOperationV6

key	type	description
`sender`	`string`	The account making the operation
`nonce`	`string`	Anti-replay parameter (see “Semi-abstracted Nonce Support” )
`initCode`	`string`	The initCode of the account (needed if and only if the account is not yet on-chain and needs to be created)
`callData`	`string`	The data to pass to the sender during the main execution call
`callGasLimit`	`bigint`	The amount of gas to allocate the main execution call
`verificationGasLimit`	`bigint`	The amount of gas to allocate for the verification step
`preVerificationGas`	`bigint`	The amount of gas to pay for to compensate the bundler for pre-verification execution and calldata
`maxFeePerGas`	`bigint`	Maximum fee per gas (similar to EIP-1559 max_fee_per_gas)
`maxPriorityFeePerGas`	`bigint`	Maximum priority fee per gas (similar to EIP-1559 max_priority_fee_per_gas)
`paymasterAndData`	`string`	Address of paymaster sponsoring the transaction, followed by extra data to send to the paymaster (empty for self-sponsored transaction). Revolves to '0x' if not using a paymaster, and a paymasterDummyData when estimating gas
`signature`	`string`	The signature for the userOperation. It is the data passed into the account along with the nonce during the verification step. Resolves to '0x' when the user did not provide their signature yet

Example Response

{
  userOperation: {
    sender: '0xbA1Cd2470F46778c9748ce676c00Ba48D6f0b89d',
    nonce: '0x2',
    initCode: '0x',
    callData: '0xf34308ef0000000000000000000000001a02592a3484c2077d2e5d24482497f85e1980c6000000000000000000000000000000000000000000000000000000000000000500000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
    callGasLimit: '0xa5e8',
    verificationGasLimit: '0x1825b',
    preVerificationGas: '0xcb5c',
    maxFeePerGas: '0x3b9aca1e',
    maxPriorityFeePerGas: '0x3b9aca00',
    paymasterAndData: '0x3fe285dcd76bcce4ac92d38a6f2f8e964041e020000000000000000000000000000000000000000003000064cfa9640000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000064c82c6734b770b84cdf835ba3d1df6237178138c98ec5bef635cf8f3f2ac1fa3c0528a98b33c5ec5d5ab559f79ed3cac4ebb6b57de127840b433557938e46151b',
    signature: '0x8a45a5eadb9f2f4b552ec20fa63424dbecca28a7a6f43f065298574861869071446b622ccc17c2eab539115afceb314f859a1cc7e9289935c4fddce833cda3ca1c'
  },
  entryPoint: '0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789',
  blockNumber: '0x908994',
  blockHash: '0xd7d5471af5fdf2359031a5b0b7ac4c664b62aaaa0e4a65c248ef0fe78b7eeb9f',
  transactionHash: '0xc8262db778457c24d8faa043879de973d6c8699ddb518b3864004d99093ce6e4'
}

JSON-RPC Method

eth_getUserOperationByHash

getUserOperationReceipt

Returns the receipt of a UserOperation by its hash returned from sendUserOperation

Usage

example.ts
Param Type
Return Type

example.ts
import { Bundler } from "abstractionkit";

const bundlerRPC = "https://sepolia.voltaire.candidewallet.com/rpc";
const bundler: Bundler = new Bundler(bundlerRPC);
const userOperationHash = "0xb348b32bc9b9e90620839c3926db401558806b03b2a46dc6de21d3a4ed8412fb";

const userOperationReceipt = await bundler.getUserOperationReceipt(
  userOperationHash
);

key	type	description
`userOpHash`	`string`	UserOperation Hash

key type description

userOpHash string The hash of the user operation.

entryPoint string The address of the entry point contract that processed the operation.

sender string The address of the sender of the user operation.

nonce bigint The nonce of the user operation.

paymaster string The address of the paymaster that paid for the gas of the user operation.

actualGasCost bigint The actual gas cost incurred for executing the user operation.

actualGasUsed bigint The actual amount of gas used for the user operation.

success boolean Indicates whether the user operation was successful.

logs string The logs produced during the execution of the user operation.

receipt

key type description
blockHash string The hash of the block in which the transaction was included.
blockNumber bigint The number of the block in which the transaction was included.
from string The address that initiated the transaction.
cumulativeGasUsed bigint The total amount of gas used in the block up to and including this transaction.
gasUsed bigint The amount of gas used by this transaction.
logs string Logs generated by the transaction.
logsBloom string The bloom filter for the logs generated by the transaction.
transactionHash string The unique hash of the transaction.
transactionIndex bigint The index of the transaction within the block.
effectiveGasPrice bigint The effective gas price for the transaction. This field is optional and may not be present in all receipts.

The detailed receipt of the user operation.

Example Response

{
  userOpHash: '0xb348b32bc9b9e90620839c3926db401558806b03b2a46dc6de21d3a4ed8412fb',
  entryPoint: '0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789',
  sender: '0xba1cd2470f46778c9748ce676c00ba48d6f0b89d',
  nonce: '0x2',
  paymaster: '0x3fe285dcd76bcce4ac92d38a6f2f8e964041e020',
  actualGasCost: 130079001821106,
  actualGasUsed: 130079,
  success: true,
  logs: '[]',
  receipt: {
    blockHash: '0xd7d5471af5fdf2359031a5b0b7ac4c664b62aaaa0e4a65c248ef0fe78b7eeb9f',
    blockNumber: '0x908994',
    from: '0x3cfdc212769c890907bce93d3d8c2c53de6a7a89',
    cumulativeGasUsed: '0x5f780b',
    gasUsed: '0x1f069',
    logs: '[{"address":"0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789","blockHash":"0xd7d5471af5fdf2359031a5b0b7ac4c664b62aaaa0e4a65c248ef0fe78b7eeb9f","blockNumber":"0x908994","data":"0x","logIndex":"0x5b","removed":false,"topics":["0xbb47ee3e183a558b1a2ff0874b079f3fc5478b7454eacf2bfc5af2ff5878f972"],"transactionHash":"0xc8262db778457c24d8faa043879de973d6c8699ddb518b3864004d99093ce6e4","transactionIndex":"0x2f"},{"address":"0x3fe285dcd76bcce4ac92d38a6f2f8e964041e020","blockHash":"0xd7d5471af5fdf2359031a5b0b7ac4c664b62aaaa0e4a65c248ef0fe78b7eeb9f","blockNumber":"0x908994","data":"0x0000000000000000000000000000000000000000000000000000000000000000","logIndex":"0x5c","removed":false,"topics":["0xa050a122b4c0e369e3385eb6b7cccd8019638b2764de67bec0af99130ddf8471","0xb348b32bc9b9e90620839c3926db401558806b03b2a46dc6de21d3a4ed8412fb","0x000000000000000000000000ba1cd2470f46778c9748ce676c00ba48d6f0b89d","0x0000000000000000000000000000000000000000000000000000000000000000"],"transactionHash":"0xc8262db778457c24d8faa043879de973d6c8699ddb518b3864004d99093ce6e4","transactionIndex":"0x2f"},{"address":"0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789","blockHash":"0xd7d5471af5fdf2359031a5b0b7ac4c664b62aaaa0e4a65c248ef0fe78b7eeb9f","blockNumber":"0x908994","data":"0x000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000764e60b23fb2000000000000000000000000000000000000000000000000000000000001fc1f","logIndex":"0x5d","removed":false,"topics":["0x49628fd1471006c1482da88028e9ce4dbb080b815c9b0344d39e5a8e6ec1419f","0xb348b32bc9b9e90620839c3926db401558806b03b2a46dc6de21d3a4ed8412fb","0x000000000000000000000000ba1cd2470f46778c9748ce676c00ba48d6f0b89d","0x0000000000000000000000003fe285dcd76bcce4ac92d38a6f2f8e964041e020"],"transactionHash":"0xc8262db778457c24d8faa043879de973d6c8699ddb518b3864004d99093ce6e4","transactionIndex":"0x2f"}]',
    logsBloom: '0x000000000000000000000000000001080000000000000000000000000000000000080000000000000002000100000000001000000000000000000a00000000000000000000000000000000040000000000000000010000000000000000800000000000000a0000000000002000000800000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000004000000000040400000000004000000000000000000000002000000000000000000000000000001200000000000000000000000000000100000000022000000000000000000000000000000000000000000000000000000000010000000',
    transactionHash: '0xc8262db778457c24d8faa043879de973d6c8699ddb518b3864004d99093ce6e4',
    transactionIndex: '0x2f',
    effectiveGasPrice: '0x69'
  }
}

JSON-RPC Method

eth_getUserOperationReceipt

Bundler

Usage​

Import​

How to use​

Paramaters​

bundlerURL string​

Methods​

chainId​

Usage​

JSON-RPC Method​

supportedEntryPoints​

Usage​

JSON-RPC Method​

estimateUserOperationGas​

Usage​

JSON-RPC Method​

sendUserOperation​

Usage​

JSON-RPC Method​

getUserOperationByHash​

Usage​

JSON-RPC Method​

getUserOperationReceipt​

Usage​

JSON-RPC Method​

Usage

Import

How to use

Paramaters

bundlerURL `string`

Methods

chainId

Usage

JSON-RPC Method

supportedEntryPoints

Usage

JSON-RPC Method

estimateUserOperationGas

Usage

JSON-RPC Method

sendUserOperation

Usage

JSON-RPC Method

getUserOperationByHash

Usage

JSON-RPC Method

getUserOperationReceipt

Usage

JSON-RPC Method