I will create some graphical representation of my models, so that we can discuss them better. Until that, I can write I have allocated funds, already. I decided to risk an overall ~$1000 on the experiment, ~$500 per testing one setup. A setup means a collection of active trading programs and their actual settings. In the experiment, each model will have a setup and each setup will run concurrently with the other one, one setup per one exchange account.  From now on, let us call one of the setup, where the Ruby communication bridge is used, "@BloodAmplifier" and the other one "@SwarmBorg". @BloodAmplifier will be used on Poloniex while @SwarmBorg will run on oKEX. I will share more about these names later.

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Hello! You are welcome ^_^

As you wrote correctly, I used USDT as base currency at oKEX
and no, the base currency does not necessarily have to be BTC

You can select the base currency per exchange in your ARBI settings.