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So I have to make transactions in order to receive the interest?

EDIT: Ok, made a transaction and received the interest. Thanks!

One simple way of doing it is to withdraw 0.001 HBD from the savings account and then cancel the transaction. That way you don't have to make any actual transfer. On Peakd.com you can do this by clicking on the "claim interest" button on the wallet page. That button appears when the interest is due.