I have been using Nadex off and on over the years. I had been trying to trade options on traditional sites, but didn't really have enough money to do so. Therefore I turned to Nadex because you can trade there with small accounts. I just finished a trade for USD/JPY above 271. It finished at 271.2. Nadex says I did not win the trade. Their excuse? A mealy-mouthed explanation which says, in effect, don't rely on the data we post as it may not be accurate. Translation: if you are going to win a trade by a close amount, we'll rip you off and justify it by claiming that the data is bad. I don't find that to be ethical nor honest. Buyer be ware and trade there at your own risk!