The WoWTokenPrices.com Data Feed is released under the "Open Data Commons Attribution License".
You can read the full license in it's entirety here.
For those of you who don't speak "legalese", a human-readable summary of the license can be found here.
It is my top priority to keep WTP data as up-to-date as possible. That being said, things happen so keep in mind that the data is provided as is.
Please include a link to WoWTokenPrices.com if you use the WTP Data Feed on your site.