My company, OpenCNAM (https://opencnam.com/ https://opencnam.com/) provides a caller ID API with a pretty generous free tier. No signup required. You can hit th

My company, OpenCNAM (https://opencnam.com/ https://opencnam.com/) provides a caller ID API with a pretty generous free tier. No signup required. You can hit the public API endpoints directly with a GET request, and get back caller ID information for a given phone number. Enjoy!