Every month you have FREE "Credits for Offers" to put your stock on the top on search results: up to 30 if you are a Premium company, 10 if you are not.
Using these credits you can make offers of specific references, or use it in My Stock on the top so your stock appears on the first places on search results.
1 Reference Offer = 1 Credit
Once the free credits are finished, you can purchase a package of credits. These packages can also be used for any payments on the web: Inquiries, Demands, Surplus Lots offers, etc.. The larger the package is the cheaper the credit will be.

