I would love to add some new exchanges in there for you (and me) and would be happy to do so with just a little guidance as to which objects you're using for it without me doing a full code dig.

Assuming this is easily extensible. If not, I guess that would be my feature request... lol. Extensible exchange objects with documentation.

It look like some currencies have more precision in the mouseover display on the plot than others. For example, EOS shows many digits past the decimal while ETH only shows two. Adding a few more digits would make interpreting the charts much easier. The left plot shows the rounding I'm describing and the right shows the higher precision that EOS displays.

![rounding](https://user-images.githubu