I can provide you with an overview of how you can access Phemex's REST API and historic Bitcoin data, and how to create a harmonic trading algorithm in Python, but I cannot create a GUI for you.

To access Phemex's REST API, you need to register and create an API key on the Phemex website. Once you have your API key, you can use Python to make REST API calls using the requests library. You can install this library using pip by running pip install requests in your command prompt.

To access historic Bitcoin data, you can use a third-party API such as the one provided by CryptoCompare. You can use the requests library to make API calls to CryptoCompare and retrieve the historic data.

Once you have the historic Bitcoin data, you can use it to create a harmonic trading algorithm. Harmonic trading is a technical analysis method that uses specific chart patterns to predict future price movements. There are different harmonic patterns that you can use, such as the Gartley pattern or the Bat pattern.

To create a harmonic trading algorithm, you need to identify the specific harmonic patterns that you want to use and write code to detect those patterns in the historic Bitcoin data. You can use libraries such as NumPy and Pandas to manipulate the data and libraries like Matplotlib or Plotly to visualize the data and the detected patterns.

Finally, you can use your harmonic trading algorithm to make trading decisions, such as buying or selling Bitcoin based on the detected patterns.

As for the GUI, you can use Python's built-in libraries like Tkinter to create a simple graphical user interface for your algorithm, which allows you to input trading parameters and see the results of your trading decisions.
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