EXHIBIT 10.2 December 23, 1998 Mr. Roger Peirce U.S. Wireless Data, Inc. 2200 Powell Street, Suite 800 Emeryville, CA 94608-1876 Dear Roger: This letter will serve as confirmation that U.S. Wireless Data shares issued and held in the name of Liviakis Financial Communications, Inc., John M. Liviakis, and Robert B. Prag will be under "lock up" until December 31, 1999 Sincerely, /s/ John M. Liviakis /s/ Robert B. Prag - ------------------------ ------------------ John M. Liviakis Robert B. Prag President Sr. Vice President