转自吾爱。不知道联通不做鉴权直接开放给公网随意查询是否合适。

python：

import requests
import json
# 联通手机号码
phone = "xxxxxxxxxxx"
url = "https://weixin.10010js.com/app/charge/qryRealFee"
headers = {
    "Host": "weixin.10010js.com",
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Content-Length": "23",
    "Accept": "*/*",
    "Referer": "https://weixin.10010js.com/actPage/activity/index28.html?",
    "Accept-Language": "zh-cn",
    "User-Agent": "Mozilla/5.0 (Linux; U; Android 8.1.0; zh-cn; BLA-AL00 Build/HUAWEIBLA-AL00) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.132 MQQBrowser/8.9 Mobile Safari/537.36"
}
data = {
    "phone": phone
}
req = requests.post(url, json.dumps(data), headers=headers)
money = int(req.text)/100
print(money)

<?php
$url="https://weixin.10010js.com/app/charge/qryRealFee";
$data='{"phone":'.'"'.$_GET["phone"].'"}';
echo "您的帐户余额是:<font color=red size=30>".(curl_post($url,$data)/100)."</font>元人民币";
   function curl_post($url,$data){
     $headers = array(
    "Host:weixin.10010js.com",
    "Content-Type:application/json",
    "Cache-Control:no-cache",
    "Content-Length:23",
    "Accept:*/*",
    "Referer:https://weixin.10010js.com/actPage/activity/index28.html?",
    "Accept-Language:zh-cn",
    "User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36"
);
       $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url); 
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);         
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);    
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        $output = curl_exec($ch);
        curl_close($ch);
        return $output;
    }        
?>

有人做好现成的，可以直接试试：

调用地址： http://api.dooper.top:8899/api/liantong/?nub=
请求方式：GET
返回类型：JSON
请求示例： http://api.dooper.top:8899/api/liantong/?nub=13288888888