If your plan requires attribution (check your plan details in the Developers section of the PredictHQ Web App) you will need to include the text
Events by PredictHQ wherever you display our data. You can also include a hyperlink to predicthq.com.
The attribution text should be clearly visible to users and be placed close to the data. Ideally, it should be visible to the user at the same time as the data itself. If this is not practical, e.g. in a mobile app with limited space, it may be placed in a "Settings" or "About" page.