diff --git a/s2a_service.py b/s2a_service.py
index 857ff35..1f44758 100644
--- a/s2a_service.py
+++ b/s2a_service.py
@@ -814,3 +814,224 @@ def s2a_batch_import_accounts(
             progress_callback(i + 1, total, email, status)
 
     return results
+
+
+# ==================== API 密钥用量查询 ====================
+def s2a_get_api_keys(page: int = 1, page_size: int = 50, timezone: str = "Asia/Shanghai") -> Optional[Dict[str, Any]]:
+    """获取 API 密钥列表
+
+    Args:
+        page: 页码
+        page_size: 每页数量
+        timezone: 时区
+
+    Returns:
+        dict: API 响应数据 或 None
+    """
+    if not S2A_API_BASE or (not S2A_ADMIN_KEY and not S2A_ADMIN_TOKEN):
+        return None
+
+    headers = build_s2a_headers()
+
+    try:
+        response = http_session.get(
+            f"{S2A_API_BASE}/api/v1/keys",
+            headers=headers,
+            params={"page": page, "page_size": page_size, "timezone": timezone},
+            timeout=REQUEST_TIMEOUT
+        )
+
+        if response.status_code == 200:
+            result = response.json()
+            if result.get("code") == 0:
+                return result.get("data", {})
+            else:
+                log.warning(f"S2A 获取密钥列表失败: {result.get('message', 'Unknown error')}")
+        else:
+            log.warning(f"S2A 获取密钥列表失败: HTTP {response.status_code}")
+
+    except Exception as e:
+        log.warning(f"S2A 获取密钥列表异常: {e}")
+
+    return None
+
+
+def s2a_get_key_usage_stats(
+    api_key_id: int,
+    start_date: str,
+    end_date: str,
+    timezone: str = "Asia/Shanghai"
+) -> Optional[Dict[str, Any]]:
+    """获取单个 API 密钥的详细用量统计
+
+    Args:
+        api_key_id: 密钥 ID
+        start_date: 开始日期 (YYYY-MM-DD)
+        end_date: 结束日期 (YYYY-MM-DD)
+        timezone: 时区
+
+    Returns:
+        dict: 用量统计数据 或 None
+    """
+    if not S2A_API_BASE or (not S2A_ADMIN_KEY and not S2A_ADMIN_TOKEN):
+        return None
+
+    headers = build_s2a_headers()
+
+    try:
+        response = http_session.get(
+            f"{S2A_API_BASE}/api/v1/admin/usage/stats",
+            headers=headers,
+            params={
+                "api_key_id": api_key_id,
+                "start_date": start_date,
+                "end_date": end_date,
+                "timezone": timezone
+            },
+            timeout=REQUEST_TIMEOUT
+        )
+
+        if response.status_code == 200:
+            result = response.json()
+            if result.get("code") == 0:
+                return result.get("data", {})
+            else:
+                log.warning(f"S2A 获取密钥用量失败: {result.get('message', 'Unknown error')}")
+        else:
+            log.warning(f"S2A 获取密钥用量失败: HTTP {response.status_code}")
+
+    except Exception as e:
+        log.warning(f"S2A 获取密钥用量异常: {e}")
+
+    return None
+
+
+def s2a_get_keys_with_usage(start_date: str = None, end_date: str = None, timezone: str = "Asia/Shanghai") -> Optional[List[Dict[str, Any]]]:
+    """获取密钥列表并合并用量数据
+
+    Args:
+        start_date: 开始日期 (YYYY-MM-DD)，默认今日
+        end_date: 结束日期 (YYYY-MM-DD)，默认今日
+        timezone: 时区
+
+    Returns:
+        list: 包含用量信息的密钥列表 或 None
+    """
+    from datetime import datetime
+
+    # 获取密钥列表
+    keys_data = s2a_get_api_keys(page=1, page_size=100, timezone=timezone)
+    if not keys_data:
+        return None
+
+    keys = keys_data.get("items", [])
+    if not keys:
+        return []
+
+    # 默认今日
+    if not start_date:
+        start_date = datetime.now().strftime("%Y-%m-%d")
+    if not end_date:
+        end_date = datetime.now().strftime("%Y-%m-%d")
+
+    # 获取每个密钥的用量
+    for key in keys:
+        key_id = key.get("id")
+        if key_id:
+            usage = s2a_get_key_usage_stats(key_id, start_date, end_date, timezone)
+            key["usage"] = usage if usage else {}
+        else:
+            key["usage"] = {}
+
+    return keys
+
+
+def format_keys_usage(keys: List[Dict[str, Any]], period_text: str = "今日") -> str:
+    """格式化密钥用量为可读文本
+
+    Args:
+        keys: 密钥列表 (包含 usage 字段)
+        period_text: 时间段描述
+
+    Returns:
+        str: 格式化后的文本
+    """
+    if not keys:
+        return "暂无密钥数据"
+
+    def fmt_cost(n):
+        """格式化费用"""
+        if n >= 1000:
+            return f"${n:,.2f}"
+        elif n >= 1:
+            return f"${n:.2f}"
+        return f"${n:.4f}"
+
+    def fmt_tokens(n):
+        """格式化 Token 数量"""
+        if n >= 1_000_000_000:
+            return f"{n / 1_000_000_000:.2f}B"
+        elif n >= 1_000_000:
+            return f"{n / 1_000_000:.2f}M"
+        elif n >= 1_000:
+            return f"{n / 1_000:.1f}K"
+        return str(int(n))
+
+    def fmt_duration(ms):
+        """格式化耗时"""
+        if ms >= 1000:
+            return f"{ms / 1000:.2f}s"
+        return f"{ms:.0f}ms"
+
+    lines = [f"<b>🔑 API 密钥用量 ({period_text})</b>", ""]
+
+    total_requests = 0
+    total_tokens = 0
+    total_cost = 0
+
+    for key in keys:
+        name = key.get("name", "未命名")
+        key_str = key.get("key", "")
+        status = key.get("status", "unknown")
+        group = key.get("group", {})
+        group_name = group.get("name", "默认") if group else "默认"
+
+        usage = key.get("usage", {})
+        requests = usage.get("total_requests", 0)
+        tokens = usage.get("total_tokens", 0)
+        input_tokens = usage.get("total_input_tokens", 0)
+        output_tokens = usage.get("total_output_tokens", 0)
+        cache_tokens = usage.get("total_cache_tokens", 0)
+        cost = usage.get("total_actual_cost", 0)
+        avg_duration = usage.get("average_duration_ms", 0)
+
+        total_requests += requests
+        total_tokens += tokens
+        total_cost += cost
+
+        # 状态图标
+        status_icon = "✅" if status == "active" else "⏸️"
+
+        # 密钥脱敏显示
+        if len(key_str) > 12:
+            key_display = f"{key_str[:6]}...{key_str[-4:]}"
+        else:
+            key_display = key_str[:8] + "..." if key_str else "N/A"
+
+        lines.append(f"{status_icon} <b>{name}</b> ({group_name})")
+        lines.append(f"   密钥: <code>{key_display}</code>")
+        lines.append(f"   请求: {requests:,} | 耗时: {fmt_duration(avg_duration)}")
+        lines.append(f"   Token: {fmt_tokens(tokens)} (入:{fmt_tokens(input_tokens)} 出:{fmt_tokens(output_tokens)})")
+        if cache_tokens > 0:
+            lines.append(f"   缓存: {fmt_tokens(cache_tokens)}")
+        lines.append(f"   费用: {fmt_cost(cost)}")
+        lines.append("")
+
+    # 汇总
+    lines.append(f"<b>📊 {period_text}汇总</b>")
+    lines.append(f"   密钥数: {len(keys)}")
+    lines.append(f"   总请求: {total_requests:,}")
+    lines.append(f"   总 Token: {fmt_tokens(total_tokens)}")
+    lines.append(f"   总费用: {fmt_cost(total_cost)}")
+
+    return "\n".join(lines)
diff --git a/telegram_bot.py b/telegram_bot.py
index ac81954..a581d46 100644
--- a/telegram_bot.py
+++ b/telegram_bot.py
@@ -8,11 +8,12 @@ from functools import wraps
 from pathlib import Path
 from typing import Optional
 
-from telegram import Update, Bot, BotCommand
+from telegram import Update, Bot, BotCommand, InlineKeyboardButton, InlineKeyboardMarkup
 from telegram.ext import (
     Application,
     CommandHandler,
     MessageHandler,
+    CallbackQueryHandler,
     filters,
     ContextTypes,
 )
@@ -50,7 +51,7 @@ from config import (
 )
 from utils import load_team_tracker, get_all_incomplete_accounts
 from bot_notifier import BotNotifier, set_notifier, progress_finish
-from s2a_service import s2a_get_dashboard_stats, format_dashboard_stats
+from s2a_service import s2a_get_dashboard_stats, format_dashboard_stats, s2a_get_keys_with_usage, format_keys_usage
 from email_service import gptmail_service, unified_create_email
 from logger import log
 
@@ -118,6 +119,7 @@ class ProvisionerBot:
             ("reload", self.cmd_reload),
             ("s2a_config", self.cmd_s2a_config),
             ("clean", self.cmd_clean),
+            ("keys_usage", self.cmd_keys_usage),
         ]
         for cmd, handler in handlers:
             self.app.add_handler(CommandHandler(cmd, handler))
@@ -128,6 +130,12 @@ class ProvisionerBot:
             self.handle_json_file
         ))
 
+        # 注册回调查询处理器 (InlineKeyboard)
+        self.app.add_handler(CallbackQueryHandler(
+            self.callback_keys_usage,
+            pattern="^keys_usage:"
+        ))
+
         # 注册定时检查任务
         if TELEGRAM_CHECK_INTERVAL > 0 and AUTH_PROVIDER == "s2a":
             self.app.job_queue.run_repeating(
@@ -189,6 +197,7 @@ class ProvisionerBot:
             BotCommand("reload", "重载配置文件"),
             BotCommand("clean", "清理数据文件"),
             BotCommand("dashboard", "查看 S2A 仪表盘"),
+            BotCommand("keys_usage", "查看 API 密钥用量"),
             BotCommand("stock", "查看账号库存"),
             BotCommand("s2a_config", "配置 S2A 参数"),
             BotCommand("import", "导入账号到 team.json"),
@@ -231,6 +240,7 @@ class ProvisionerBot:
 
 <b>📊 S2A 专属:</b>
 /dashboard - 查看 S2A 仪表盘
+/keys_usage - 查看 API 密钥用量
 /stock - 查看账号库存
 /s2a_config - 配置 S2A 参数
 
@@ -1184,6 +1194,125 @@ class ProvisionerBot:
         except Exception as e:
             await update.message.reply_text(f"❌ 错误: {e}")
 
+    @admin_only
+    async def cmd_keys_usage(self, update: Update, context: ContextTypes.DEFAULT_TYPE):
+        """查看 API 密钥用量 - 显示时间选择菜单"""
+        if AUTH_PROVIDER != "s2a":
+            await update.message.reply_text(
+                f"⚠️ 密钥用量查询仅支持 S2A 模式\n"
+                f"当前模式: {AUTH_PROVIDER}"
+            )
+            return
+
+        # 创建时间选择按钮
+        keyboard = [
+            [
+                InlineKeyboardButton("📅 今天", callback_data="keys_usage:today"),
+                InlineKeyboardButton("📅 昨天", callback_data="keys_usage:yesterday"),
+            ],
+            [
+                InlineKeyboardButton("📆 近 7 天", callback_data="keys_usage:7d"),
+                InlineKeyboardButton("📆 近 14 天", callback_data="keys_usage:14d"),
+            ],
+            [
+                InlineKeyboardButton("📆 近 30 天", callback_data="keys_usage:30d"),
+                InlineKeyboardButton("📆 本月", callback_data="keys_usage:this_month"),
+            ],
+            [
+                InlineKeyboardButton("📆 上月", callback_data="keys_usage:last_month"),
+            ],
+        ]
+        reply_markup = InlineKeyboardMarkup(keyboard)
+
+        await update.message.reply_text(
+            "<b>🔑 API 密钥用量查询</b>\n\n请选择时间范围:",
+            reply_markup=reply_markup,
+            parse_mode="HTML"
+        )
+
+    async def callback_keys_usage(self, update: Update, context: ContextTypes.DEFAULT_TYPE):
+        """处理密钥用量查询的回调"""
+        query = update.callback_query
+        await query.answer()
+
+        # 验证权限
+        user_id = update.effective_user.id
+        if user_id not in TELEGRAM_ADMIN_CHAT_IDS:
+            await query.edit_message_text("⛔ 无权限")
+            return
+
+        from datetime import datetime, timedelta
+
+        # 解析回调数据
+        data = query.data.replace("keys_usage:", "")
+        today = datetime.now()
+
+        if data == "today":
+            start_date = today.strftime("%Y-%m-%d")
+            end_date = today.strftime("%Y-%m-%d")
+            period_text = "今天"
+        elif data == "yesterday":
+            yesterday = today - timedelta(days=1)
+            start_date = yesterday.strftime("%Y-%m-%d")
+            end_date = yesterday.strftime("%Y-%m-%d")
+            period_text = "昨天"
+        elif data == "7d":
+            start_date = (today - timedelta(days=6)).strftime("%Y-%m-%d")
+            end_date = today.strftime("%Y-%m-%d")
+            period_text = "近 7 天"
+        elif data == "14d":
+            start_date = (today - timedelta(days=13)).strftime("%Y-%m-%d")
+            end_date = today.strftime("%Y-%m-%d")
+            period_text = "近 14 天"
+        elif data == "30d":
+            start_date = (today - timedelta(days=29)).strftime("%Y-%m-%d")
+            end_date = today.strftime("%Y-%m-%d")
+            period_text = "近 30 天"
+        elif data == "this_month":
+            start_date = today.replace(day=1).strftime("%Y-%m-%d")
+            end_date = today.strftime("%Y-%m-%d")
+            period_text = "本月"
+        elif data == "last_month":
+            first_of_this_month = today.replace(day=1)
+            last_month_end = first_of_this_month - timedelta(days=1)
+            last_month_start = last_month_end.replace(day=1)
+            start_date = last_month_start.strftime("%Y-%m-%d")
+            end_date = last_month_end.strftime("%Y-%m-%d")
+            period_text = "上月"
+        else:
+            await query.edit_message_text("❌ 未知的时间选项")
+            return
+
+        await query.edit_message_text(f"⏳ 正在获取密钥用量 ({period_text})...")
+
+        try:
+            keys = s2a_get_keys_with_usage(start_date, end_date)
+            if keys is not None:
+                text = format_keys_usage(keys, period_text)
+                # 消息太长时分段发送
+                if len(text) > 4000:
+                    # 先更新原消息
+                    await query.edit_message_text(text[:4000], parse_mode="HTML")
+                    # 剩余部分新消息发送
+                    remaining = text[4000:]
+                    while remaining:
+                        chunk = remaining[:4000]
+                        remaining = remaining[4000:]
+                        await context.bot.send_message(
+                            chat_id=update.effective_chat.id,
+                            text=chunk,
+                            parse_mode="HTML"
+                        )
+                else:
+                    await query.edit_message_text(text, parse_mode="HTML")
+            else:
+                await query.edit_message_text(
+                    "❌ 获取密钥用量失败\n"
+                    "请检查 S2A 配置和 API 连接"
+                )
+        except Exception as e:
+            await query.edit_message_text(f"❌ 错误: {e}")
+
     @admin_only
     async def cmd_stock(self, update: Update, context: ContextTypes.DEFAULT_TYPE):
         """查看账号存货"""