See for more information http://www.touchatag.com/developer
Today, only the free touchatag basic and developer licenses are available.
There is no hard limit today for the number of registered tags or readers, nor for the number of transactions. Off course, the principles of fair use as explained in our terms & conditions apply to avoid any misusage of the system. Using touchatag for commercial applications is allowed, but keep into account the non guaranteed SLA or support.
We revisit these guidelines on a regular basis, so this information is subject to change and we expect to implement more developer functionalities, service and support in the course of 2010.