API Trial Test Drive Our Super Smart B2B Company And Contact Data APIs. Demandbase delivers Smarter Intelligence to fuel your B2B applications. Want to give it a try? It’s the most accurate, actionable, and reliable B2B company and contact data on the planet. Add to that our simple REST-based APIs and outstanding customer service, and you’ll soon discover how easy it is to integrate Demandbase APIs into your innovative apps. Go ahead, give it a try. Inject more value into your apps, be dazzled by the quick ramp time, and delight your users and customers with the data they long for. PLEASE NOTE: Email verification will be required to access the API trial.