The Open Bank Project Node.js SDK by Open Bank Project can communicate with the API to implement banking features into mobile applications. Resources show OAuth access token, request, and JSON responses.
Read-it-later service Instapaper has released what it's calling a "full API." With it, developers using the Instapaper API can create applications that both write to and read from the service. The full API is free to developers, but only paying users can read from their Instapaper account using third-party tools.