ccxt is good stuff.
   [my information may be outdated]
   it's _buggy_ so prepare to use it as-is if you want to actually
   accomplish anything
   it uses a quick homebrew transpiler to produce the various apis.
   efforts to improve the transpiler have mysteriously stalled.
   I believe ccxt added support relatively recently for streaming updates,
   which may provide for lucrative high-frequency trading.
   what darknet and p2p exchanges are supported and what features are
   supported on them, is important information.