The min. GIN is 2000 credits and must be made before any bids are placed. When you go to your auction page, Hit the button to edit and at the bottom, click on the button called, "Show Advanced Options" There is an option to do a GIN - click the box and fill in your GIN. It will take 50 credits from you to do any GIN plus, when you sell for a GIN, you will also get less credits - Listia gets about 10% of the GIN price. Hope that helps.