PostLinks.com is a text link brokerage that allows webmasters to buy and sell text links. It uses a system that supports Article Posts, Contextual Links, and Comment Links. The PostLinks.com Link Building API lets webmasters improve their search engine rankings by building links. Users can create custom link building scripts or integrate link building into their existing online control panel. The API includes almost all of the functionality that is available through the PostLinks.com Control Panel. The API uses REST and SOAP protocol with responses in XML and JSON.