Crypto Historical Data Analysis -- 2

I'm in need of a professional with experience in Python and machine learning for an assessment task. The job involves retrieving historical trading data for the Bitcoin/US Dollar pair over the last 5 years and calculating several analytical metrics.

Key Tasks:
- Identify a reliable API for crypto data retrieval
- Retrieve historical data for the specified trading pair
- Calculate the highest, lowest, and percentage difference metrics
- Analyze the average trading volume

Ideal Skills and Experience:
- Proficiency in Python
- Experience with machine learning
- Familiarity with crypto data APIs
- Strong analytical skills