An API that is currently in use is the “People In Space API.” As the name implies, it is a simple API that returns the current, up-to-date data on the number of people in space right now along with their names and the names of the spacecrafts that they are on. It takes NASA’s data and and displays it in a simple programming interface. There is no input for this API. Data that has not been displayed in this API are the previous records on the number of people in space.

http://api.open-notify.org/astros.json

http://open-notify.org/Open-Notify-API/People-In-Space/