24:T451,That's an option as well, however I don't know if it's a good idea to add them a singleton. What I did now is the following, not sure if this a good practice: **Program.cs** ``` builder.Services.AddScoped(); builder.Services.AddHostedService(); ``` **InitializationService** ``` public sealed class InitializationService : IHostedService { private readonly IServiceProvider _serviceProvider; private readonly ILogger _logger; public InitializationService(ILogger logger,, IServiceProvider serviceProvider) { _logger = logger; _serviceProvider = serviceProvider; } public async Task StartAsync(CancellationToken token) { using (IServiceScope scope = _serviceProvider.CreateScope()) { CardanoService cardanoService = scope.ServiceProvider.GetRequiredService(); await cardanoService.Initialize(); } } public async Task StopAsync(CancellationToken token) { await Task.Yield(); } } ```25:T4c5,@Welles I would definitely go with the factory pattern for this. Effectively that means you'll have one interface/class responsible for creating the one you need. Since constructors can't be async, I would recommend a static async factory method on the type you're constructing as well. ``` public interface ICardanoFactory { ValueTask CreateAsync(CancellationToken cancellationToken); } public class DefaultCardanoFactory : ICardanoFactory { private IDependency _dependency; public DefaultCardanoFactory(IDependency dependency) => _dependency = dependency; public async ValueTask CreateAsync(CancellationToken cancellationToken) => await CardanoService.CreateAsync(_dependency, cancellationToken); } public class CardanoService : ICardanoService { public static ValueTask CreateAsync(IDependency dependency, CancellationToken cancellationToken) { var svc = new CardanoService(dependency); await svc.InitializeAsync(cancellationToken); return svc; } private CardanoService(IDependency dependency) => _dependency = dependency; private ValueTask InitializeAsync(CancellationToken cancellationToken) => throw new NotImplementedException(); } ```26:T4bc,``` public async static Task CreateAsync(ILogger logger, IHostEnvironment hostingEnv, BlockfrostService blockfrostService, IConfiguration configuration, DataContext dataContext, CancellationToken cancellationToken) { var svc = new CardanoService(logger,hostingEnv,blockfrostService,configuration,dataContext); await svc.Initialize(cancellationToken); return svc; } private CardanoService(ILogger logger, IHostEnvironment hostingEnv, BlockfrostService blockfrostService, IConfiguration configuration, DataContext dataContext) { _logger = logger; _hostingEnv = hostingEnv; _configuration = configuration; _blockfrostService = blockfrostService; _dataContext= dataContext; _coinSelectionService = new CoinSelectionService(new RandomImproveStrategy(), new SingleTokenBundleStrategy()); fundingWallet = _configuration["TGC:FundWallet"]; _logger.LogDebug($"{this.GetType().Name} initialized!"); } ``` Then I just do builder.services.AddScope(); Might be with the latter I'm doing something wrong. the init function is not being called atm27:T4bc,``` public async static Task CreateAsync(ILogger logger, IHostEnvironment hostingEnv, BlockfrostService blockfrostService, IConfiguration configuration, DataContext dataContext, CancellationToken cancellationToken) { var svc = new CardanoService(logger,hostingEnv,blockfrostService,configuration,dataContext); await svc.Initialize(cancellationToken); return svc; } private CardanoService(ILogger logger, IHostEnvironment hostingEnv, Bloc

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