Please watch out for scammers https://www.usenext.com
Their offer is on tapjoy for 512 gold reward, BUT THIS IS SCAM.
They state that you can cancel your “free” trial whenever you like, but they won’t let you do this online and they will ignore any other forms of contacts. No coins too. I used to do few of offers like that one, but I’ve never been scammed.
Some sources state that they charging even after you deactivated your trial somehow (from PayPal etc). Take care, now you really need to survive in TWDRTS lol