# Sandbox.Services.Ai.Chat.TotalCreditsSpent

```csharp
System.Nullable<decimal> TotalCreditsSpent { get; set; }
```

Total credits charged for this chat, or null when accounting is unavailable or incomplete.
Refreshed by assistant and server-tool responses.

Declared in [Sandbox.Services.Ai.Chat](/api/Sandbox.Services.Ai.Chat).
Assembly: `Sandbox.Engine`.