CityDeals.com, local/national deal and discount finder, enables developers to access its deals database via the CityDeals API. Third party apps can feature daily deals and discounts, or provide a searchable interface of CityDeals.com's entire portfolio of discounts. CityDeals.com partners with retailers and service providers around the globe to provide an expansive offer of discounts applicable on a national scale or at the local level.
ODesk claims to be the future of work, or more recently: "Work 3.0." So it should come as no surprise that the next version of work comes with an API. If you’re not familiar with the platform, oDesk provides contractors and companies with a hourly billing system which both verifies the work done for the company, and guarantees payment to the contractor.
Email doesn't need postage, right? Is that old hoax about the postal service charging per message finally coming true? Not really. But PostageApp may be a service worth paying for if you want to send email from your application.