The reCaptcha PHP Sample Code by 2Captcha demonstrates how to access captcha features for verification purposes. It is powered by an algorithm that recognizes images as the authentication method. Users can access the API at https://2captcha.com/api-2captcha
Stannp.com is a free app that allows users to quickly and easily create their own custom-made postcards. The company provides the Stannp API that allows developers to integrate this tool into other applications. By snapping a picture or using an existing image, the user has the option to customize the image with fun effects and add the finished product to their Facebook wall, email it to a friend or have it turned into a real postcard to be posted the same day.