Price based arbitrage was very successful for Edward Thorpe http://www.edwardothorp.com/books/a-man-for-all-markets/

No successful strategy ever has been based on price. Price isn't stationary so you can't do anything with it. You need to be looking at the log returns. Price is completely irrelevant, at least for equities.

trading forex swaps as an individual is a disservice. its not centralized at all, as a retail you get spreaded quotes from some banks that want to make markets and that is it really. many of the biggest fx brokers have been banned in the us over the years too for all sorts of awful things [1]. there are cross bank quoting and such but the whole thing is extremely unsuitable for retails, making it prime for low barrier to entry decimation of retails which is exactly what you'll see time and again.

if you really care to trade currency rates in a sane way, there are CME futures

1 http://www.forexscamalerts.com/fxcm-permanently-banned-usa-f...