GunBroker.com offers access to the world's largest firearms auction platform. The REST API allows developers to interact with custom software applications or web pages. Developers can create mobile sites that access the GunBroker API, display GunBroker results, and manage accounts. JSON is the preferred response format.
Thirteen APIs have been added to the ProgrammableWeb directory in categories including Cryptocurrency, Games, and Payments. Highlights include the CarbonDoomsDay API which provides CO2 levels public data for applications and the MakePrintable API for analyzing 3D printable content.