The I'm Human API is "where humanity wins the fight against machines," according to elxsy.com, the provider of the service. I'm Human is a visual CAPTCHA service which responds with a word, a grid of up to 25 images and the grid numbers which correspond to the correct answers. Humans must select the images that match the words and your application compares the results to the correct answer from the I'm Human API.
The following is a list of how-to and tutorial content that matched your search term. ProgrammableWeb's how-to content comes from two sources; full-blown tutorials that we publish ourselves and other highly relevant tutorials that we find elsewhere on the Web. This list represents on combination of both tutorial types and if you go to ProgrammableWeb's API University, you'll not only be able to find more, they are organized based on your role (API providers or developers who consumes APIs). If you know of a tutorial that would be of interest to the ProgrammableWeb community, we'd like to know about it. Be sure to check our guidelines for making contributions to ProgrammableWeb.