Thank you for your contribution.

1. I would suggest you manage your commits via Pull Requests i.e. you can create a branch and submit a PR to merge to your master branch - this way the branch will contain more descriptive commits instead of single big commit.
2. You three exchanges could all extend to a interface which has a `query_rates` function signature. So you code will be much more organized later when you want to switch exchanges.
3. You might want to look at the APIs from `coinmarketcap` that can be used to convert between any two currencies/fiat - not use USD/BTC, BTC/STEEM, or BTC/SBD
4. Getting medians may be better than averaging the rates from exchanges . Sometimes, one exchange may show up abnormal rates because of pumping.

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