diff --git a/app/api/admin/usage/summary/route.js b/app/api/admin/usage/summary/route.js
new file mode 100644
index 0000000..bf18558
--- /dev/null
+++ b/app/api/admin/usage/summary/route.js
@@ -0,0 +1,20 @@
+import { NextResponse } from 'next/server';
+import { requireAdmin } from '@/lib/session';
+import { engine } from '@/lib/engine';
+
+// GET /api/admin/usage/summary?range=today&group_by=service
+export async function GET(req) {
+  const admin = await requireAdmin();
+  if (!admin) return NextResponse.json({ error: 'Forbidden' }, { status: 403 });
+  try {
+    const { searchParams } = new URL(req.url);
+    const params = {};
+    if (searchParams.get('range'))    params.range = searchParams.get('range');
+    if (searchParams.get('group_by')) params.group_by = searchParams.get('group_by');
+    if (searchParams.get('service'))  params.service = searchParams.get('service');
+    const data = await engine.usageSummary(params);
+    return NextResponse.json(data);
+  } catch (err) {
+    return NextResponse.json({ error: err.message }, { status: err.status || 500 });
+  }
+}
diff --git a/components/SystemSettings.js b/components/SystemSettings.js
index ef2720f..7851091 100644
--- a/components/SystemSettings.js
+++ b/components/SystemSettings.js
@@ -1,13 +1,14 @@
 'use client';
 import { useState, useEffect } from 'react';
-import { Loader2, Save, Eye, EyeOff, RefreshCw, Check, AlertCircle } from 'lucide-react';
+import { Loader2, Save, Eye, EyeOff, RefreshCw, Check, AlertCircle, BarChart3 } from 'lucide-react';
 
 // Категории, которые управляются здесь (в админке tool, а не в админке блога).
 // Категория `engine` (TELEGRAM_API_BASE и т.п.) намеренно живёт в zeropost.ru/admin.
 const CATEGORIES = [
+  { slug: 'ai_providers', title: 'AI провайдеры',
+    hint: 'Ключи, URL и модели для текстовой и картиночной генерации. Меняются на лету — рестарт engine не нужен. Курс USD↔РУБ и наценка реселлера тут же — влияют на расчёт стоимости в блоке «Расход AI» выше.' },
   { slug: 'photo_search', title: 'Поиск фото',
     hint: 'Yandex Search API: provider, ключ, folder, лимиты.' },
-  // Сюда позже: { slug: 'billing', ... }, { slug: 'serpapi', ... }
 ];
 
 export default function SystemSettings() {
@@ -59,6 +60,7 @@ export default function SystemSettings() {
 
   return (
     <div className="space-y-6">
+      <UsageSummary />
       {CATEGORIES.map(cat => (
         <CategoryBlock
           key={cat.slug}
@@ -71,6 +73,137 @@ export default function SystemSettings() {
   );
 }
 
+const RANGE_LABELS = [
+  { key: 'today', label: 'Сегодня' },
+  { key: 'week',  label: 'Неделя' },
+  { key: 'month', label: 'Месяц' },
+  { key: 'all',   label: 'Всё' },
+];
+
+function UsageSummary() {
+  const [range, setRange] = useState('today');
+  const [groupBy, setGroupBy] = useState('service');
+  const [data, setData] = useState(null);
+  const [loading, setLoading] = useState(true);
+  const [err, setErr] = useState('');
+
+  async function load() {
+    setLoading(true);
+    setErr('');
+    try {
+      const res = await fetch(`/api/admin/usage/summary?range=${range}&group_by=${groupBy}`);
+      if (!res.ok) throw new Error((await res.json()).error || `HTTP ${res.status}`);
+      setData(await res.json());
+    } catch (e) {
+      setErr(e.message);
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  useEffect(() => { load(); /* eslint-disable-next-line react-hooks/exhaustive-deps */ }, [range, groupBy]);
+
+  const fmtRub  = v => (Number(v) || 0).toLocaleString('ru-RU', { minimumFractionDigits: 2, maximumFractionDigits: 2 }) + ' ₽';
+  const fmtInt  = v => (Number(v) || 0).toLocaleString('ru-RU');
+
+  return (
+    <section className="card p-5">
+      <div className="flex items-center justify-between flex-wrap gap-2 mb-4">
+        <div className="flex items-center gap-2">
+          <BarChart3 className="w-5 h-5 text-accent" />
+          <h2 className="font-semibold">Расход AI</h2>
+        </div>
+        <div className="flex items-center gap-2">
+          <div className="flex rounded-md overflow-hidden border border-border">
+            {RANGE_LABELS.map(r => (
+              <button
+                key={r.key}
+                onClick={() => setRange(r.key)}
+                className={`px-2.5 py-1 text-xs ${range === r.key ? 'bg-accent text-white' : 'bg-surface2/50 hover:bg-surface2 text-gray-300'}`}
+              >
+                {r.label}
+              </button>
+            ))}
+          </div>
+          <select
+            value={groupBy}
+            onChange={e => setGroupBy(e.target.value)}
+            className="input text-xs h-7 py-0"
+          >
+            <option value="service">по сервисам</option>
+            <option value="provider">по провайдерам</option>
+            <option value="model">по моделям</option>
+          </select>
+          <button onClick={load} className="btn-ghost p-1.5" title="Обновить">
+            <RefreshCw className={`w-4 h-4 ${loading ? 'animate-spin' : ''}`} />
+          </button>
+        </div>
+      </div>
+
+      {err && (
+        <div className="text-xs text-red-400 mb-3">{err}</div>
+      )}
+
+      {data && (
+        <>
+          <div className="grid grid-cols-2 sm:grid-cols-4 gap-3 mb-4">
+            <Stat label="Сумма"           value={fmtRub(data.totals.cost_rub)} accent />
+            <Stat label="Вызовов"         value={fmtInt(data.totals.calls)}
+                  sub={data.totals.failed ? `${data.totals.failed} ошибок` : 'все успешно'} />
+            <Stat label="Токенов"         value={fmtInt(data.totals.prompt_tokens + data.totals.completion_tokens)}
+                  sub={`${fmtInt(data.totals.prompt_tokens)} вход / ${fmtInt(data.totals.completion_tokens)} выход`} />
+            <Stat label="Картинок"        value={fmtInt(data.totals.image_count)}
+                  sub={data.totals.avg_duration_ms ? `сред. ${(data.totals.avg_duration_ms/1000).toFixed(1)}с` : ''} />
+          </div>
+
+          {data.breakdown.length > 0 && (
+            <div className="rounded-lg border border-border overflow-hidden">
+              <table className="w-full text-xs">
+                <thead className="bg-surface2/50">
+                  <tr className="text-left text-gray-500">
+                    <th className="px-3 py-2 font-medium">
+                      {groupBy === 'service' ? 'Сервис' : groupBy === 'provider' ? 'Провайдер' : 'Модель'}
+                    </th>
+                    <th className="px-3 py-2 font-medium text-right">Вызовов</th>
+                    <th className="px-3 py-2 font-medium text-right">Токены</th>
+                    <th className="px-3 py-2 font-medium text-right">Картинки</th>
+                    <th className="px-3 py-2 font-medium text-right">Стоимость</th>
+                  </tr>
+                </thead>
+                <tbody>
+                  {data.breakdown.map(row => (
+                    <tr key={row.key} className="border-t border-border/50">
+                      <td className="px-3 py-2 font-mono">{row.key}</td>
+                      <td className="px-3 py-2 text-right">{fmtInt(row.calls)}{row.failed ? <span className="text-red-400 ml-1">({row.failed} err)</span> : null}</td>
+                      <td className="px-3 py-2 text-right">{fmtInt(row.prompt_tokens + row.completion_tokens)}</td>
+                      <td className="px-3 py-2 text-right">{fmtInt(row.image_count)}</td>
+                      <td className="px-3 py-2 text-right font-mono">{fmtRub(row.cost_rub)}</td>
+                    </tr>
+                  ))}
+                </tbody>
+              </table>
+            </div>
+          )}
+
+          {data.breakdown.length === 0 && (
+            <p className="text-sm text-gray-500">За выбранный период вызовов не было.</p>
+          )}
+        </>
+      )}
+    </section>
+  );
+}
+
+function Stat({ label, value, sub, accent }) {
+  return (
+    <div className={`rounded-lg p-3 ${accent ? 'bg-accent/10 border border-accent/30' : 'bg-surface2/50 border border-border'}`}>
+      <div className="text-[10px] uppercase tracking-wide text-gray-500">{label}</div>
+      <div className={`text-lg font-semibold mt-0.5 ${accent ? 'text-accent' : ''}`}>{value}</div>
+      {sub && <div className="text-[11px] text-gray-500 mt-0.5">{sub}</div>}
+    </div>
+  );
+}
+
 function CategoryBlock({ category, rows, onSaved }) {
   return (
     <section className="card p-5">
diff --git a/lib/engine.js b/lib/engine.js
index 199a438..34978db 100644
--- a/lib/engine.js
+++ b/lib/engine.js
@@ -69,6 +69,13 @@ export const engine = {
   updateSetting:  (key, value) => call(`/api/settings/admin/${encodeURIComponent(key)}`, { method: 'PUT', body: { value } }),
   invalidateSettingsCache: () => call('/api/settings/admin/invalidate', { method: 'POST' }),
 
+  // AI usage (admin)
+  usageSummary: (params = {}) => {
+    const qs = new URLSearchParams(params).toString();
+    return call(`/api/usage/summary${qs ? '?' + qs : ''}`);
+  },
+  usageRecent:  (limit = 20) => call(`/api/usage/recent?limit=${limit}`),
+
   // Calendar
   getCalendar: (userId, params = {}) => {
     const qs = new URLSearchParams(params).toString();