Will the orders even allow you to place an order with $3 as your capital? Binance says $10 for the minimum amount and let's say that poloniex allows that.
What's going to be your profit with that? I know that everyone can start as little as they can be but this challenge is so hard at all to pass. But if this is just for the sake of content and satisfaction then, I'd wish you nothing but good luck with this because even I do this as a challenge, I think that I won't make it far.
Making it far comes with a price to be paid. Satisfaction is basically for all trader, who will reportedly earn from the system without undergoing exact problematic sectors and challenges. Opening a trade with $3? I assumed it will be one of these exchanges that does the unthinkable and provide slimed features for the main objective to persuade customers to partner with their exchange. Most of these crypto exchanges doesn't last long in the system because they can't survive the bear season and not enough liquidity to fuel the space.