I'd heard that it was in the region of $100k and if he's getting some extra work/endorsements should be enough for him to get by on for a year.
He might be receiving free accomodation/ food and travel so his outgoings might be minimal which all allows him another year to learn and improve, but of course in a years time he'll be up against the latest intake of very good collegiate talent, who will still have years and years of experience over him.
His one advantage is that he shines a light on the NFL from international audiences and the NFL might be keen for one of the franchises to sign him, almost as a marketing tool (no disrespect to Wadey).