Pricing
The API and all data returned from it are licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
This means that the API and the questions it returns are free for noncommercial use. If you have somewhere suitable in your app, then please credit the API somewhere discreet - we love having our hard work shared!
If you would like to use the API commercially, or would like enhanced functionality, this service is offered through a paid subscription.