Which cryptocurrency exchange markets and trading APIs does ccxt support?
I'm curious to know, could you please elaborate on the cryptocurrency exchange markets and trading APIs that are supported by ccxt? I'm specifically interested in knowing if ccxt integrates with the most popular exchanges out there, and if it offers a comprehensive set of APIs for trading and market data retrieval. Additionally, I'd like to know if there are any limitations or restrictions in terms of the types of trades or orders that can be placed through ccxt's integration with these markets.