Hashtracking purchases historical Twitter data from third party providers. In order to simplify the process of passing along this data to you, we have created a credit system. This system allows you to bank credits for use, any time you wish to add historical data.
Credits are purchased for short term (30 days or less) Twitter history. Each credit can be traded for 1000 historical tweets. Credits can be purchased singly, or in bulk. There is a discount when you purchase credits in bulk.
To purchase credits pull down the MyAccount tab, click on Service, and click the "Buy Credits" box next to History Credits.