They allow US, CA and UK but I sent them a support ticket and asked them if it was ok if I sign-up outside of these countries and they told me it was, but I was asked to provide proof of ID on cashout.
You can check this out!
I've heard that entropay vcc's get red on free offers like myfax, efax and such, don't know about other type of vcc's...You can use a loaded vcc to do paid offers and they credit within 6h.
If you want to get PAID to green you can give me a PM! Giving out 20$ on cashout!