The third-party API usage policy has a lot in common with Blizzard's addon creation and usage policy. No premium applications or web tools that use WoW API data are allowed, which means you will not be able to be charged for access to information that is freely given. App creators will also not be able to put commercials or advertisements inside of applications that hinder the use of the application and data. Developers will, however, be able to host these apps or web tools on hosting that has advertisements -- you just can't force people to watch them or do something in order to use the app. Remember, you should not be paying for applications that use this data.
Take a look at the full third-party API usage policy after the break. If you're interesting in coding with these new APIs to create programs, web tools, or mobile apps, check out Blizzard's community platform API forum on the WoW community site. You will be in awesome company.
Filed under: Cataclysm