The Balanced iOS SDK by Ben Mills allows API communication with the aim to implement credit card and bank accounts into applications. Usage includes code to create a marketplace project, create a card, and create a bank account object.
PollDaddy, one of the most popular online poll and survey creation services, recently opened their new API to the public. The basic PollDaddy service provides free accounts for creating polls and surveys, or a Pro upgrade that eliminates sponsored links and allows higher numbers of survey responses than the free version. Now with the API, the core poll creation and reporting services are available to developers (details at our PollDaddy API profile).
Dwolla has launched a number of services and APIs in the recent past in an attempt to achieve its goal of "building the ideal API to move money." In an attempt to streamline its various services, Dwolla has repositioned its Access API to act as the umbrella to house all of its payment services.
Here's a novel concept to encourage open government applications: pay your best developers. Apparently that's exactly what the UK's Office of Public Sector Information would like to do now that it has launched Data.gov.uk.