🤖 — Telegram Bot for Derivatives & Interest Rate Calculations

This is a Telegram bot built with .NET that allows users to simulate and calculate various interest-based financial instruments, including:

• Fixed Rate Loans (Simple or Compound)
• Floating Rate Loans (with adjustable reset periods)
• Overnight Index Swaps (OIS) based on SOFR
• Trade tracking per user with persistent database storage
• SOFR integration with live data fetch from the FRED API

---

🧠 Main Features

• 🏦 Fixed Rate Calculation — supports both simple and compound interest logic
• 🌊 Floating Rate Calculation — allows interest reset every 1, 3, 6, or 12 months
• 🌙 OIS (Overnight Index Swap) — based on user-defined period and overnight rate
• 🏢 Company-based Trade Tracking — all trades are saved with timestamp and company name
• 📚 Trade History — view and reselect from your personal list of saved trades
• 🌬️ Live SOFR Fetching — /sofr command gets the latest SOFR value via the FRED API
• 📈 Step-by-step UI — bot guides user through data entry in a conversational style

---

🛠️ Technologies Used

• .NET 8
• Telegram.Bot official API
• Entity Framework Core
• PostgreSQL / SQLite (via AppDbContext)
• HTTPClient + JSON Parsing for SOFR API
• Strategy Design Pattern for modular interest calculations
• LINQ, async/await, enums, and clean separation of concerns

---

📦 Project Structure (simplified)

TradingSystem/
├── 🧮 CalculationService/           
│   ├── Controllers/                
│   ├── Core/                      
│   └── Program.cs
├── 💾 TradeManagementService/      
│   ├── Controllers/                 
│   ├── Models/                    
│   ├── Data/                      
│   └── Program.cs
└── 🌉 ApiGateway/                   
    ├── Controllers/               
    └── Program.cs

TG_Fitz_Bot/                         
├── Services/ApiGatewayService.cs   
└── Program.cs                       

📱 Try It in Telegram

You can interact with the bot directly here: https://t.me/iamfitz_bot

⚙️ The bot supports inline keyboards and conversational input to guide you through calculations with ease.

🧪 Future Improvements (Ideas)

• Multi-company support per user
• Export trade history to CSV
• Admin dashboard (web UI)
• Custom amortization schedules
• Visual charts of rate dynamics