What assets are supported by BitMEX?

Could you please elaborate on the range of assets that are supported by BitMEX? Are they limited to a select few cryptocurrencies, or do they also offer exposure to traditional financial assets such as stocks, bonds, or commodities? Furthermore, how does BitMEX ensure the security and stability of these assets, given the volatile nature of the cryptocurrency market? Additionally, are there any specific requirements or restrictions for traders looking to access these assets on the BitMEX platform?