To review your credit balance and activity, go to the My Statement tab on the Dashboard:  

Your credit history can be filtered by Date and Action Type:  

You can also download your history in PDF or CSV formats:  

Statement information includes the transaction type (earned credit, convert credit, cancel convert credit, etc.), Amount of credits, Balance after the transaction, a link to the relevant Project, number of Words, Source and Target languages, Expertise category, and action Date.