August 6th, 2015, 5:51 pm
Firstly, I am yet to encounter an IRS w/ term EONIA as a floating rate. Secondly, how can you possibly know all the cash flows? Yes, today's fixing might be negative, but this doesn't have to hold for the life of the swap. Finally, it is, in fact, perfectly feasible to have a reasonable term par swap with a negative fixed rate (e.g. Swiss). By convention such a position is still called "paid" (I avoid "payer" and "receiver" terminology for swaps, to prevent confusion with swaptions).