Well I also believe it's a well known issue that was never denied, but of course I can imagine wouldn't want to get into a position when I would send them the traffic without knowing it.
But it's up to AWE.
I believe
VISIT-X should fit your needs, not sure if they pay with epass but they are good people.
On another note, I am looking for someone with a bit of knowledge of the spanish online market, you think we could get in touch and chat a bit anytime soon?