I bought 11 BTC from coinbase [at $430 each] and i sold them at satelexchange [at $466 each].
The total profit i got is $400 and i managed to do this in less than 2 hours!
My first step was to buy BTC with USD [from
https://www.coinbase.com if you are able to, or somewhere where the price is similar to $429].
My second step was to sell those same BTC for paypal USD [at
https://www.satelexchange.com].
So basically you can buy 1 BTC for $429 and sell it for $466. The profit is around $37 per BTC.
Even in two hours, the Bitcoin price can fluctuate a lot.
It could fall by several dollars very quickly (Unless they have fixed daily prices and not live daily prices).