There are so many jobs listed for developers familiar with the Paypal API on GetAFreelancer that the site has a category dedicated to it. And that's not all--there are over 300 API-related listings on the site, which connects freelancers with people who need programmers and designers.
Stage of Life, loyalty marketing agency, has launched its Coupon API. The API pulls from the Stage of Life Merchant Network. The network includes hundreds of national brand merchant offers, coupons, and discounts. Access through the API gives developers the flexibility to enhance current loyalty programs, or build stand alone applications.