smart-account-deployment

Development

Help users deploy ERC-4337 smart accounts using Nethereum — predict counterfactual addresses with CREATE2, deploy via SmartAccountBuilder, lazy deploy via InitCode, manage EntryPoint deposits. Use when the user mentions deploying a smart account, creating a smart wallet, CREATE2 account address, counterfactual address, SmartAccountBuilder, SimpleAccountFactory, or account factory deployment in .NET/C#.

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Smart Account Deployment

Deploy ERC-4337 smart accounts using SmartAccountBuilder — predict addresses before deployment with CREATE2, deploy upfront or lazily via the first UserOperation's InitCode.

When to Use This

User wants to deploy a new smart contract wallet
User needs to predict an account address before deployment (CREATE2)
User wants lazy deployment — deploy the account as part of the first UserOperation
User is working with SimpleAccountFactory or custom account factories

Packages

dotnet add package Nethereum.Web3
dotnet add package Nethereum.AccountAbstraction
dotnet add package Nethereum.AccountAbstraction.SimpleAccount

SmartAccountBuilder (Recommended)

The fluent builder predicts addresses, deploys via factory, and returns a ready-to-use service:

using Nethereum.AccountAbstraction.Extensions;
using Nethereum.Web3;

var web3 = new Web3(new Nethereum.Web3.Accounts.Account(privateKey), rpcUrl);

// Predict address without deploying
var address = await web3.CreateSmartAccount()
    .WithFactory(factoryAddress)
    .WithOwnerKey(privateKey)
    .WithSalt(0)
    .GetAddressAsync();

// Deploy and get ready-to-use service
var account = await web3.CreateSmartAccount()
    .WithFactory(factoryAddress)
    .WithOwnerKey(privateKey)
    .BuildAsync();

Console.WriteLine(quot;Deployed at: {account.Address}");
Console.WriteLine(quot;Is deployed: {await account.IsDeployedAsync()}");

Builder Methods

Method	Description
`WithFactory(string)`	Required. Factory contract address
`WithOwner(string)`	Owner address
`WithOwnerKey(string)` or `WithOwnerKey(EthECKey)`	Owner from private key
`WithSalt(BigInteger)`	CREATE2 salt (default 0)
`WithValidator(string)`	ERC-7579 validator module address
`WithModule(BigInteger, string, byte[])`	Add module (type, address, init data)
`FromExisting(string)`	Load already-deployed account
`BuildAsync()`	Deploy (if needed) → `SmartAccountService`
`GetAddressAsync()`	Counterfactual address without deploying
`GetInitCodeAsync()`	Init code bytes for UserOperation

Load Existing Account

// Via builder
var account = await web3.CreateSmartAccount()
    .FromExisting(accountAddress)
    .BuildAsync();

// Shortcut
var account = await web3.GetSmartAccountAsync(accountAddress);

Lazy Deployment via InitCode

Deploy the account as part of the first UserOperation:

// Get init code from builder
var builder = web3.CreateSmartAccount()
    .WithFactory(factoryAddress)
    .WithOwnerKey(privateKey);

var initCode = await builder.GetInitCodeAsync();
var address = await builder.GetAddressAsync();

// Set on UserOperation
var userOp = new UserOperation
{
    Sender = address,
    InitCode = initCode,
    // ... other fields
};

Automatic with AAContractHandler

erc20Service.ChangeContractHandlerToAA(
    counterfactualAddress, privateKey, bundlerUrl, entryPointAddress,
    new FactoryConfig
    {
        FactoryAddress = factoryAddress,
        Owner = ownerAddress,
        Salt = 0
    });

// First call deploys + executes atomically
var receipt = await erc20Service.TransferRequestAndWaitForReceiptAsync(
    new TransferFunction { To = recipient, Value = amount });

EntryPoint Deposits

var deposit = await account.GetDepositAsync();
await account.AddDepositAsync(Web3.Convert.ToWei(0.1m));
await account.WithdrawDepositToAsync(withdrawAddress, amount);

EntryPoint Versions

Use EntryPointAddresses.Latest (V09) for new deployments. The account is bound to the EntryPoint version at deploy time.

Common Mistakes

Not funding the counterfactual address before the first UserOperation
Changing the salt between prediction and deployment (produces different address)
Wrong factory address between prediction and deployment
Wrong EntryPoint — account is bound to one version

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