{
  "ok": true,
  "usage": {
    "ip": [
      "GET /",
      "GET /json",
      "GET /?format=json"
    ],
    "geo": "GET /geo",
    "all": "GET /all",
    "check": "POST /check { type:'http'|'socks5', proxies:[ ... ], timeoutMs?:6000, maxConcurrent?:5 }"
  }
}