Google Sheets-Coinbase Portfolio Script -- 2

I'm seeking a skilled freelancer to create a Google Apps Script that connects Google Sheets with Coinbase, focusing on real-time cryptocurrency portfolio performance monitoring. This script will become an integral tool for managing my investments more effectively by providing up-to-date information directly within a Google Sheet.

I've attached example code which can be built on.

**Core Requirements:**
- Develop a Google Apps Script.
- Link the script to Coinbase to monitor various cryptocurrency performances in real-time.
- The script should update the portfolio data in a Google Sheet automatically.
- Design the script to be flexible for future feature additions or modifications.

**Ideal Skills and Experience:**
- Proficient in Google Apps Script.
- Experience with API integration, specifically Coinbase API.
- Knowledge in handling real-time data updates within Google Sheets.
- Understanding of cryptocurrency market fundamentals.
- Prior work on financial monitoring tools is a plus.

This project is perfect for someone who is detail-oriented, has a strong background in software development, particularly with Google Apps Scripts, and possesses a deep understanding of cryptocurrency markets.