All about Numbers. REST access with json/xml/jsonp result support. Below is the documentation for the Numbers API. You can try them out right here. Find more information and subscribe at math.tools
curl \ -H "X-Mathtools-Api-Secret: $API_KEY" \ https://api.math.tools/numbers/pi
curl \ -H "X-Mathtools-Api-Secret: $API_KEY" \ https://api.math.tools/numbers/nod
curl \ -H "X-Mathtools-Api-Secret: $API_KEY" \ https://api.math.tools/numbers/base