The official PlayFab Node.js SDK by PlayFab calls the Playfab REST API to access game backend services. Features include analytics, player accounts, and virtual goods. TLS v1.1 is needed to connect to the Playfab service.
If math is about measurement, then Mathletics may have your child's number. Much like games that post the best scores of players, the Mathletics SOAP API makes student scores accessible to programs as well as its website.