Addressable provides a REST API for creating custom handwritten notes that are created by robots.

Most mail just gets thrown out. Addressable’s beautiful, handwritten notes tell exactly the story you want to just the right people, and that means you get more calls and listing appointments!
Every piece of our mail is written (by a robot) with a real ballpoint pen, and so every letter is personalized, and every letter is different.

Addressable provides a RESTful API for creating and sending handwritten custom notes. Sending handwritten mail can now be automated, and only requires a POST request with a JSON body of your content.