They state:
OANDA charges an initial licensing fee of USD $600, which entitles the customer to two free months of access to one API library for testing and implementation. After these two months, a monthly fee applies. The monthly fee is USD $600, discounted by USD $50 for every USD $1M in monthly volume of currency traded from the account.
So if an external connection could initially be setup, it doesn't mean that Ninjatrader will have to pay for this. The cost will pass through to the customer. If cost is the biggest hurdle then it looks like it's not really a factor.
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