What is APX portfolio?

Could you please elaborate on what exactly the APX portfolio entails? I'm curious to understand its components, how it's structured, and what sets it apart from other investment portfolios in the cryptocurrency and finance realm. Additionally, I'm interested in knowing if it's specifically tailored towards a certain type of investor or if it's a diversified portfolio suitable for a wide range of investors. Furthermore, what are the potential risks and rewards associated with investing in the APX portfolio, and how does it aim to generate returns for its investors?