aa-bundler

Development

Help users run an ERC-4337 bundler using Nethereum — set up in-process or standalone bundlers with mempool, validation, reputation, and JSON-RPC server. Use when the user mentions running a bundler, ERC-4337 bundler setup, BundlerService, BundlerConfig, bundler RPC server, mempool configuration, UserOperation validation, or bundler presets (AppChain, Standard, Production) in .NET/C#.

QUICK START

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Run an ERC-4337 Bundler

Nethereum includes a full ERC-4337 bundler — collects UserOperations, validates them, manages a mempool with reputation tracking, and submits bundles to the EntryPoint.

When to Use This

User wants to run their own bundler instead of using a third-party service
User is building an application chain that needs an integrated bundler
User needs to configure bundler settings (validation, mempool, reputation)
User wants a JSON-RPC endpoint for the bundler

Packages

dotnet add package Nethereum.AccountAbstraction.Bundler
dotnet add package Nethereum.AccountAbstraction.Bundler.RpcServer  # for JSON-RPC endpoint

Quick Start

using Nethereum.AccountAbstraction.Bundler;
using Nethereum.Web3;
using Nethereum.Web3.Accounts;

var web3 = new Web3(new Account(privateKey), "http://localhost:8545");

var config = BundlerConfig.CreateAppChainConfig(
    entryPoint: EntryPointAddresses.Latest,
    beneficiary: "0xBeneficiaryAddress");

var bundlerService = new BundlerService(web3, config);

// Submit a UserOperation
string userOpHash = await bundlerService.SendUserOperationAsync(
    packedUserOp, EntryPointAddresses.Latest);

// Trigger immediate bundling
BundleResult result = await bundlerService.ExecuteBundleAsync();

// Check receipt
var receipt = await bundlerService.GetUserOperationReceiptAsync(userOpHash);

Configuration Presets

Preset	Use Case	StrictValidation	ERC-7562	AutoBundle
`CreateAppChainConfig`	Private chains	false	false	1s
`CreateStandardConfig`	Public testnets	true	true	10s
`CreateProductionConfig`	Mainnet	true	true	10s + staking

var appConfig = BundlerConfig.CreateAppChainConfig(entryPoint, beneficiary);
var stdConfig = BundlerConfig.CreateStandardConfig(entryPoint, beneficiary);
var prodConfig = BundlerConfig.CreateProductionConfig(entryPoint, beneficiary);

Key Config Properties

Property	Default	Description
`MaxBundleSize`	10	Max UserOperations per bundle
`MaxMempoolSize`	1000	Max UserOperations in mempool
`AutoBundleIntervalMs`	10000	Bundle interval (0 = manual)
`StrictValidation`	true	Enforce ERC-4337 rules
`EnableERC7562Validation`	false	Trace-based opcode validation
`UnsafeMode`	false	Skip all validation (testing only)
`MinStake`	1 ETH	Min stake for reputation
`WhitelistedAddresses`	empty	Exempt from reputation checks
`BlacklistedAddresses`	empty	Permanently rejected

JSON-RPC Server

using Nethereum.AccountAbstraction.Bundler.RpcServer;

var rpcServer = new RpcServer();
rpcServer.AddBundlerHandlers(bundlerService);

// Or create bundler from config:
rpcServer.AddBundlerHandlers(web3, config);

Standard RPC Methods

Method	Description
`eth_sendUserOperation`	Submit UserOperation
`eth_estimateUserOperationGas`	Estimate gas
`eth_getUserOperationByHash`	Look up by hash
`eth_getUserOperationReceipt`	Get receipt
`eth_supportedEntryPoints`	List EntryPoints
`eth_chainId`	Return chain ID

Debug Methods

Method	Description
`debug_bundler_sendBundleNow`	Force immediate bundle
`debug_bundler_dumpMempool`	Dump mempool contents
`debug_bundler_dumpReputation`	Dump reputation scores
`debug_bundler_setReputation`	Set reputation manually

Reputation and Staking

var config = BundlerConfig.CreateProductionConfig(entryPoint, beneficiary);
config.WhitelistedAddresses.Add("0xYourPaymaster");  // trust your paymaster
config.BlacklistedAddresses.Add("0xBadFactory");      // block bad actors

Common Mistakes

No beneficiary — required, receives bundler fees
Wrong EntryPoint — bundler only accepts ops targeting SupportedEntryPoints
AutoBundle=0 without manual bundling — ops pile up, never submitted
UnsafeMode in production — skips all validation, wastes gas on bad ops

For full documentation, see: https://docs.nethereum.com/docs/account-abstraction/guide-run-bundler