To get a direct prime brokerage relationship with a tier 1 bank where you are dealing on credit lines on their platform, you are going to need signifigant capital, a little less than 10 million US to be safe, and you are going to have to do atleast a hundred million a day in volume to make them happy and make you seem worthwhile. You are responsible for your own swaps, and your credit lines would allow you to trade FX Spot as well as forwards and options if you desire. It is rare to find an individual trader who is prime broking directly with a tier 1 bank who makes markets in the "interbank market"