diff --git a/docs/KaigenConfiguration.md b/docs/KaigenConfiguration.md
new file mode 100644
index 0000000..dac1429
--- /dev/null
+++ b/docs/KaigenConfiguration.md
@@ -0,0 +1,64 @@
+# Kaigen Service Configuration
+
+The Kaigen service is used for managing user credits during backtest operations. It requires proper configuration to function correctly.
+
+## Environment Variables
+
+### Required Environment Variable
+
+- **`KAIGEN_PRIVATE_KEY`**: The private key used for signing API requests to the Kaigen service.
+
+### Setting the Environment Variable
+
+#### Development
+```bash
+export KAIGEN_PRIVATE_KEY="your-private-key-here"
+```
+
+#### Production
+Set the environment variable in your deployment configuration:
+```bash
+KAIGEN_PRIVATE_KEY=your-private-key-here
+```
+
+#### Docker
+```bash
+docker run -e KAIGEN_PRIVATE_KEY=your-private-key-here your-app
+```
+
+#### Docker Compose
+```yaml
+environment:
+  - KAIGEN_PRIVATE_KEY=your-private-key-here
+```
+
+## Configuration Structure
+
+The Kaigen service configuration is defined in `appsettings.json`:
+
+```json
+{
+  "Kaigen": {
+    "BaseUrl": "https://api.kaigen.managing.live",
+    "DebitEndpoint": "/api/credits/debit",
+    "RefundEndpoint": "/api/credits/refund",
+    "PrivateKey": "${KAIGEN_PRIVATE_KEY}"
+  }
+}
+```
+
+## API Endpoints
+
+- **PUT** `/api/credits/debit` - Debit credits from user account
+- **PUT** `/api/credits/refund` - Refund credits to user account
+
+## Security Notes
+
+- The private key should never be committed to source control
+- Use environment variables or secure configuration management systems
+- The private key is used for signing API requests to ensure authenticity
+- Rotate the private key regularly for enhanced security
+
+## Error Handling
+
+If the `KAIGEN_PRIVATE_KEY` environment variable is not set, the application will throw an `InvalidOperationException` with a clear error message during startup. 
\ No newline at end of file
diff --git a/src/Managing.Api/appsettings.Production.json b/src/Managing.Api/appsettings.Production.json
index a968b63..e9f9567 100644
--- a/src/Managing.Api/appsettings.Production.json
+++ b/src/Managing.Api/appsettings.Production.json
@@ -32,5 +32,11 @@
   },
   "AllowedHosts": "*",
   "WorkerBotManager": true,
-  "WorkerBalancesTracking": true
+  "WorkerBalancesTracking": true,
+  "Kaigen": {
+    "BaseUrl": "https://api.kaigen.managing.live",
+    "DebitEndpoint": "/api/credits/debit",
+    "RefundEndpoint": "/api/credits/refund",
+    "PrivateKey": "${KAIGEN_PRIVATE_KEY}"
+  }
 }
\ No newline at end of file
diff --git a/src/Managing.Api/appsettings.json b/src/Managing.Api/appsettings.json
index 66ea9e6..41dfa96 100644
--- a/src/Managing.Api/appsettings.json
+++ b/src/Managing.Api/appsettings.json
@@ -24,6 +24,12 @@
   "Web3Proxy": {
     "BaseUrl": "http://localhost:4111"
   },
+  "Kaigen": {
+    "BaseUrl": "https://api.kaigen.managing.live",
+    "DebitEndpoint": "/api/credits/debit",
+    "RefundEndpoint": "/api/credits/refund",
+    "PrivateKey": "${KAIGEN_PRIVATE_KEY}"
+  },
   "N8n": {
     "WebhookUrl": "https://n8n.kai.managing.live/webhook/fa9308b6-983b-42ec-b085-71599d655951"
   },
diff --git a/src/Managing.Application.Abstractions/Services/IKaigenService.cs b/src/Managing.Application.Abstractions/Services/IKaigenService.cs
new file mode 100644
index 0000000..07ce632
--- /dev/null
+++ b/src/Managing.Application.Abstractions/Services/IKaigenService.cs
@@ -0,0 +1,20 @@
+namespace Managing.Application.Abstractions.Services;
+
+public interface IKaigenService
+{
+    /// <summary>
+    /// Debits user credits for a backtest operation
+    /// </summary>
+    /// <param name="userName">The username to debit</param>
+    /// <param name="debitAmount">The amount to debit</param>
+    /// <returns>The request ID for tracking</returns>
+    Task<string> DebitUserCreditsAsync(string userName, decimal debitAmount);
+
+    /// <summary>
+    /// Refunds user credits if debit operation fails
+    /// </summary>
+    /// <param name="requestId">The original request ID from debit operation</param>
+    /// <param name="userName">The username to refund</param>
+    /// <returns>True if refund was successful</returns>
+    Task<bool> RefundUserCreditsAsync(string requestId, string userName);
+}
\ No newline at end of file
diff --git a/src/Managing.Application/Backtesting/Backtester.cs b/src/Managing.Application/Backtesting/Backtester.cs
index 9cfbebd..6e77b20 100644
--- a/src/Managing.Application/Backtesting/Backtester.cs
+++ b/src/Managing.Application/Backtesting/Backtester.cs
@@ -27,6 +27,7 @@ namespace Managing.Application.Backtesting
         private readonly IScenarioService _scenarioService;
         private readonly IAccountService _accountService;
         private readonly IMessengerService _messengerService;
+        private readonly IKaigenService _kaigenService;
 
         public Backtester(
             IExchangeService exchangeService,
@@ -35,7 +36,8 @@ namespace Managing.Application.Backtesting
             ILogger<Backtester> logger,
             IScenarioService scenarioService,
             IAccountService accountService,
-            IMessengerService messengerService)
+            IMessengerService messengerService,
+            IKaigenService kaigenService)
         {
             _exchangeService = exchangeService;
             _botFactory = botFactory;
@@ -44,6 +46,7 @@ namespace Managing.Application.Backtesting
             _scenarioService = scenarioService;
             _accountService = accountService;
             _messengerService = messengerService;
+            _kaigenService = kaigenService;
         }
 
         public Backtest RunSimpleBotBacktest(Workflow workflow, bool save = false)
@@ -82,20 +85,66 @@ namespace Managing.Application.Backtesting
             string requestId = null,
             object metadata = null)
         {
-            var candles = GetCandles(config.Ticker, config.Timeframe, startDate, endDate);
-
-            var result = await RunBacktestWithCandles(config, candles, user, withCandles, requestId, metadata);
-
-            // Set start and end dates
-            result.StartDate = startDate;
-            result.EndDate = endDate;
-
-            if (save && user != null)
+            string creditRequestId = null;
+            
+            // Debit user credits before starting the backtest
+            if (user != null)
             {
-                _backtestRepository.InsertBacktestForUser(user, result);
+                try
+                {
+                    creditRequestId = await _kaigenService.DebitUserCreditsAsync(user.Name, 3);
+                    _logger.LogInformation("Successfully debited credits for user {UserName} with request ID {RequestId}", 
+                        user.Name, creditRequestId);
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogError(ex, "Failed to debit credits for user {UserName}. Backtest will not proceed.", user.Name);
+                    throw new Exception($"Failed to debit credits: {ex.Message}");
+                }
             }
 
-            return result;
+            try
+            {
+                var candles = GetCandles(config.Ticker, config.Timeframe, startDate, endDate);
+
+                var result = await RunBacktestWithCandles(config, candles, user, withCandles, requestId, metadata);
+
+                // Set start and end dates
+                result.StartDate = startDate;
+                result.EndDate = endDate;
+
+                if (save && user != null)
+                {
+                    _backtestRepository.InsertBacktestForUser(user, result);
+                }
+
+                return result;
+            }
+            catch (Exception ex)
+            {
+                // If backtest fails and we debited credits, attempt to refund
+                if (user != null && !string.IsNullOrEmpty(creditRequestId))
+                {
+                    try
+                    {
+                        var refundSuccess = await _kaigenService.RefundUserCreditsAsync(creditRequestId, user.Name);
+                        if (refundSuccess)
+                        {
+                            _logger.LogInformation("Successfully refunded credits for user {UserName} after backtest failure", user.Name);
+                        }
+                        else
+                        {
+                            _logger.LogError("Failed to refund credits for user {UserName} after backtest failure", user.Name);
+                        }
+                    }
+                    catch (Exception refundEx)
+                    {
+                        _logger.LogError(refundEx, "Error during refund attempt for user {UserName}", user.Name);
+                    }
+                }
+                
+                throw;
+            }
         }
 
         /// <summary>
diff --git a/src/Managing.Bootstrap/ApiBootstrap.cs b/src/Managing.Bootstrap/ApiBootstrap.cs
index b76b2c0..96a6330 100644
--- a/src/Managing.Bootstrap/ApiBootstrap.cs
+++ b/src/Managing.Bootstrap/ApiBootstrap.cs
@@ -100,6 +100,7 @@ public static class ApiBootstrap
         services.AddTransient<IWebhookService, WebhookService>();
         services.AddTransient<ISynthPredictionService, SynthPredictionService>();
         services.AddTransient<ISynthApiClient, SynthApiClient>();
+        services.AddTransient<IKaigenService, KaigenService>();
 
         return services;
     }
@@ -118,6 +119,8 @@ public static class ApiBootstrap
         services.AddSingleton<IPrivySettings>(sp =>
             sp.GetRequiredService<IOptions<PrivySettings>>().Value);
 
+        services.Configure<KaigenSettings>(configuration.GetSection("Kaigen"));
+
         // Evm 
         services.AddGbcFeed();
         services.AddUniswapV2();
diff --git a/src/Managing.Infrastructure.Web3/Services/KaigenService.cs b/src/Managing.Infrastructure.Web3/Services/KaigenService.cs
new file mode 100644
index 0000000..949ff3f
--- /dev/null
+++ b/src/Managing.Infrastructure.Web3/Services/KaigenService.cs
@@ -0,0 +1,165 @@
+using System.Net.Http.Json;
+using System.Text.Json;
+using Managing.Application.Abstractions.Services;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using Nethereum.Signer;
+
+namespace Managing.Infrastructure.Evm.Services;
+
+/// <summary>
+/// Configuration settings for Kaigen credit management service.
+/// The PrivateKey should be set via the KAIGEN_PRIVATE_KEY environment variable for security.
+/// </summary>
+public class KaigenSettings
+{
+    public string BaseUrl { get; set; } = "https://api.kaigen.managing.live";
+    public string DebitEndpoint { get; set; } = "/api/credits/debit";
+    public string RefundEndpoint { get; set; } = "/api/credits/refund";
+    public string PrivateKey { get; set; } = string.Empty;
+}
+
+public class KaigenService : IKaigenService
+{
+    private readonly HttpClient _httpClient;
+    private readonly KaigenSettings _settings;
+    private readonly ILogger<KaigenService> _logger;
+    private readonly JsonSerializerOptions _jsonOptions;
+
+    public KaigenService(IOptions<KaigenSettings> options, ILogger<KaigenService> logger)
+    {
+        _httpClient = new HttpClient();
+        _settings = options.Value;
+        _logger = logger;
+        _jsonOptions = new JsonSerializerOptions
+        {
+            PropertyNamingPolicy = JsonNamingPolicy.CamelCase
+        };
+
+        // Validate required settings
+        if (string.IsNullOrEmpty(_settings.PrivateKey))
+        {
+            throw new InvalidOperationException("Kaigen PrivateKey is not configured. Please set the KAIGEN_PRIVATE_KEY environment variable.");
+        }
+
+        if (string.IsNullOrEmpty(_settings.BaseUrl))
+        {
+            throw new InvalidOperationException("Kaigen BaseUrl is not configured.");
+        }
+    }
+
+    public async Task<string> DebitUserCreditsAsync(string userName, decimal debitAmount)
+    {
+        try
+        {
+            var requestId = Guid.NewGuid().ToString();
+            
+            // Create the payload for signing
+            var payload = new
+            {
+                RequestId = requestId,
+                UserName = userName,
+                DebitAmount = debitAmount
+            };
+
+            // Create the message to sign (concatenate the values)
+            var message = $"{requestId}{userName}{debitAmount}";
+            
+            // Sign the message
+            var signature = SignMessage(message, _settings.PrivateKey);
+
+            // Create the request payload
+            var requestPayload = new
+            {
+                requestId = requestId,
+                userName = userName,
+                debitAmount = debitAmount,
+                signature = signature
+            };
+
+            _logger.LogInformation("Debiting {Amount} credits for user {UserName} with request ID {RequestId}", 
+                debitAmount, userName, requestId);
+
+            var response = await _httpClient.PutAsJsonAsync(
+                $"{_settings.BaseUrl}{_settings.DebitEndpoint}", 
+                requestPayload, 
+                _jsonOptions);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                var errorContent = await response.Content.ReadAsStringAsync();
+                _logger.LogError("Failed to debit credits. Status: {StatusCode}, Error: {Error}", 
+                    response.StatusCode, errorContent);
+                throw new Exception($"Failed to debit credits: {response.StatusCode} - {errorContent}");
+            }
+
+            var result = await response.Content.ReadFromJsonAsync<KaigenResponse>(_jsonOptions);
+            _logger.LogInformation("Successfully debited {Amount} credits for user {UserName}", 
+                debitAmount, userName);
+
+            return requestId;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error debiting credits for user {UserName}", userName);
+            throw;
+        }
+    }
+
+    public async Task<bool> RefundUserCreditsAsync(string requestId, string userName)
+    {
+        try
+        {
+            // Create the message to sign (concatenate the values)
+            var message = $"{requestId}{userName}";
+            
+            // Sign the message
+            var signature = SignMessage(message, _settings.PrivateKey);
+
+            // Create the request payload
+            var requestPayload = new
+            {
+                requestId = requestId,
+                userName = userName,
+                signature = signature
+            };
+
+            _logger.LogInformation("Refunding credits for user {UserName} with request ID {RequestId}", 
+                userName, requestId);
+
+            var response = await _httpClient.PutAsJsonAsync(
+                $"{_settings.BaseUrl}{_settings.RefundEndpoint}", 
+                requestPayload, 
+                _jsonOptions);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                var errorContent = await response.Content.ReadAsStringAsync();
+                _logger.LogError("Failed to refund credits. Status: {StatusCode}, Error: {Error}", 
+                    response.StatusCode, errorContent);
+                return false;
+            }
+
+            _logger.LogInformation("Successfully refunded credits for user {UserName}", userName);
+            return true;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error refunding credits for user {UserName}", userName);
+            return false;
+        }
+    }
+
+    private string SignMessage(string message, string privateKey)
+    {
+        var signer = new EthereumMessageSigner();
+        var signature = signer.EncodeUTF8AndSign(message, new EthECKey(privateKey));
+        return signature;
+    }
+
+    private class KaigenResponse
+    {
+        public bool Success { get; set; }
+        public string Message { get; set; }
+    }
+}
\ No newline at end of file