whois https://ip.tsevan.com/api/whois/<ip> Whois Information
geoip https://ip.tsevan.com/api/geoip/<ip> GeoIP information
detect_proxy https://ip.tsevan.com/api/detect_proxy

Examples:

1. Get your external IP using curl
$ curl https://ip.tsevan.com/
18.218.5.216
2. Get your ISP name with python
import requests
isp_name = requests.get('https://ip.tsevan.com/api/whois').json()['network']['name']