What it does
Where the ISS at? tells you where the International Space Station is right now: latitude, longitude, altitude, speed and whether it is in daylight. You can also ask for positions at past or future timestamps and get the two-line element (TLE) data for orbit calculations. Responses are JSON. Free, no key needed, with a limit of about one request per second.
More information: https://wheretheiss.at/w/developer