Hike checks your keyword rankings in Google. This is because Google is the primary search engine used in the world.
Hike tracks your website's position every 2 days, and it will report on your exact position within the country you selected when you first setup your account.
For example, if your customers are primarily US-based then we will search for your keyword rankings in Google US. If you chose the UK then it will search within Google UK, and so on.
To see a full overview of where you rank for your keywords head over to the keyword reporting section here.