By popular demand, we made it easy to get daily summary data using the export API. This query will return 7 days of summary data:

https://www.stathat.com/x/ACCESSTOKEN/data/STATIDD_0/STATID_1?summary=7d

You can specify any standard timeframe abbreviation, for example 2 months:

https://www.stathat.com/x/ACCESSTOKEN/data/STATIDD_0/STATID_1?summary=2M

It uses the timezone set on the settings page to split the data exactly at midnight.
Any data received since midnight is not included.