The Instagram API implementation in PHP enables developers to access the Instagram API's methods from their PHP code. This library comes with example files and sample code to help developers get started.
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.