Voxbone API offers real-time delivery of mobile and toll-free numbers from over 50 countries. Google makes the cost of cloud storage nearly free. Plus: the Australian Bureau of Labor Stats stealth API, and Acquia scales API calls for a major train operator.
Developers with a penchant for green-energy powered APIs should probably take a look at GreenQloud's IaaS offerings that are API-compatible with Amazon's EC2 and S3 services. The Icelandic company's datacenters survive on nothing but 100 percent renewable energy.