In a plain vanilla swap, the investor who pays the fixed interest rate and receives the floating interest rate. The two legs of a plain vanilla swap are a fixed interest rate, say 3.5%, and a floating interest rate, say LIBOR + 0.5%. In such a swap, the only things traded are the two interest rates, which are calculated over a notional value. The fixed rate payer gives 3.5% of the notional value to the floating rate payer and, in return, receives LIBOR + 0.5% of the same notional value. Each party pays the other at set intervals over the life of the swap.