diff --git a/routstr/core/admin.py b/routstr/core/admin.py
index 91899aaf..51db1a4e 100644
--- a/routstr/core/admin.py
+++ b/routstr/core/admin.py
@@ -1,9 +1,10 @@
 import json
 import secrets
-from datetime import datetime, timezone
+from collections import defaultdict
+from datetime import datetime, timedelta, timezone
 from pathlib import Path
 
-from fastapi import APIRouter, Depends, HTTPException, Request
+from fastapi import APIRouter, Depends, HTTPException, Query, Request
 from fastapi.responses import HTMLResponse, RedirectResponse
 from pydantic import BaseModel
 from sqlmodel import select
@@ -2958,3 +2959,321 @@ h1 { color: #333; }
 .no-logs { text-align: center; color: #666; padding: 40px; }
 .request-id-display { background-color: #e9ecef; padding: 10px; border-radius: 4px; margin-bottom: 20px; font-family: monospace; }
 """
+
+
+def _parse_log_file(file_path: Path) -> list[dict]:
+    """Parse JSON log file and return list of log entries."""
+    entries: list[dict] = []
+    try:
+        with open(file_path) as f:
+            for line in f:
+                try:
+                    entry = json.loads(line.strip())
+                    entries.append(entry)
+                except json.JSONDecodeError:
+                    continue
+    except Exception as e:
+        logger.error(f"Error reading log file {file_path}: {e}")
+    return entries
+
+
+def _aggregate_metrics_by_time(
+    entries: list[dict], interval_minutes: int, hours_back: int = 24
+) -> dict[str, list[dict]]:
+    """Aggregate log metrics into time buckets."""
+    now = datetime.now(timezone.utc)
+    cutoff = now - timedelta(hours=hours_back)
+    
+    time_buckets: dict[str, dict[str, int]] = defaultdict(
+        lambda: {
+            "total_requests": 0,
+            "successful_chat_completions": 0,
+            "failed_requests": 0,
+            "errors": 0,
+            "warnings": 0,
+            "payment_processed": 0,
+            "upstream_errors": 0,
+        }
+    )
+    
+    for entry in entries:
+        try:
+            timestamp_str = entry.get("asctime", "")
+            if not timestamp_str:
+                continue
+                
+            log_time = datetime.strptime(timestamp_str, "%Y-%m-%d %H:%M:%S")
+            log_time = log_time.replace(tzinfo=timezone.utc)
+            
+            if log_time < cutoff:
+                continue
+            
+            bucket_time = log_time.replace(
+                minute=(log_time.minute // interval_minutes) * interval_minutes,
+                second=0,
+                microsecond=0,
+            )
+            bucket_key = bucket_time.isoformat()
+            
+            message = entry.get("message", "").lower()
+            level = entry.get("levelname", "").upper()
+            
+            if level == "ERROR":
+                time_buckets[bucket_key]["errors"] += 1
+            elif level == "WARNING":
+                time_buckets[bucket_key]["warnings"] += 1
+            
+            if "received proxy request" in message:
+                time_buckets[bucket_key]["total_requests"] += 1
+            
+            if "token adjustment completed for non-streaming" in message:
+                time_buckets[bucket_key]["successful_chat_completions"] += 1
+            elif "token adjustment completed for streaming" in message:
+                time_buckets[bucket_key]["successful_chat_completions"] += 1
+            
+            if "upstream request failed" in message or "revert payment" in message:
+                time_buckets[bucket_key]["failed_requests"] += 1
+            
+            if "payment processed successfully" in message:
+                time_buckets[bucket_key]["payment_processed"] += 1
+                
+            if "upstream" in message and level == "ERROR":
+                time_buckets[bucket_key]["upstream_errors"] += 1
+                
+        except Exception:
+            continue
+    
+    result = []
+    for bucket_key in sorted(time_buckets.keys()):
+        result.append({"timestamp": bucket_key, **time_buckets[bucket_key]})
+    
+    return {
+        "metrics": result,
+        "interval_minutes": interval_minutes,
+        "hours_back": hours_back,
+        "total_buckets": len(result),
+    }
+
+
+def _get_summary_stats(entries: list[dict], hours_back: int = 24) -> dict:
+    """Calculate summary statistics from log entries."""
+    now = datetime.now(timezone.utc)
+    cutoff = now - timedelta(hours=hours_back)
+    
+    stats = {
+        "total_entries": 0,
+        "total_requests": 0,
+        "successful_chat_completions": 0,
+        "failed_requests": 0,
+        "total_errors": 0,
+        "total_warnings": 0,
+        "payment_processed": 0,
+        "upstream_errors": 0,
+        "unique_models": set(),
+        "error_types": defaultdict(int),
+    }
+    
+    for entry in entries:
+        try:
+            timestamp_str = entry.get("asctime", "")
+            if not timestamp_str:
+                continue
+                
+            log_time = datetime.strptime(timestamp_str, "%Y-%m-%d %H:%M:%S")
+            log_time = log_time.replace(tzinfo=timezone.utc)
+            
+            if log_time < cutoff:
+                continue
+            
+            stats["total_entries"] += 1
+            
+            message = entry.get("message", "").lower()
+            level = entry.get("levelname", "").upper()
+            
+            if level == "ERROR":
+                stats["total_errors"] += 1
+                if "error_type" in entry:
+                    error_type = str(entry["error_type"])
+                    stats["error_types"][error_type] += 1
+            elif level == "WARNING":
+                stats["total_warnings"] += 1
+            
+            if "received proxy request" in message:
+                stats["total_requests"] += 1
+            
+            if "token adjustment completed" in message:
+                stats["successful_chat_completions"] += 1
+                
+            if "upstream request failed" in message or "revert payment" in message:
+                stats["failed_requests"] += 1
+            
+            if "payment processed successfully" in message:
+                stats["payment_processed"] += 1
+                
+            if "upstream" in message and level == "ERROR":
+                stats["upstream_errors"] += 1
+            
+            if "model" in entry:
+                model = entry["model"]
+                if isinstance(model, str) and model != "unknown":
+                    stats["unique_models"].add(model)
+                    
+        except Exception:
+            continue
+    
+    return {
+        "total_entries": stats["total_entries"],
+        "total_requests": stats["total_requests"],
+        "successful_chat_completions": stats["successful_chat_completions"],
+        "failed_requests": stats["failed_requests"],
+        "total_errors": stats["total_errors"],
+        "total_warnings": stats["total_warnings"],
+        "payment_processed": stats["payment_processed"],
+        "upstream_errors": stats["upstream_errors"],
+        "unique_models_count": len(stats["unique_models"]),
+        "unique_models": sorted(list(stats["unique_models"])),
+        "error_types": dict(stats["error_types"]),
+        "success_rate": (
+            (stats["successful_chat_completions"] / stats["total_requests"] * 100)
+            if stats["total_requests"] > 0
+            else 0
+        ),
+    }
+
+
+@admin_router.get("/api/usage/metrics", dependencies=[Depends(require_admin_api)])
+async def get_usage_metrics(
+    request: Request,
+    interval: int = Query(default=15, ge=1, le=1440, description="Time interval in minutes"),
+    hours: int = Query(default=24, ge=1, le=168, description="Hours of history to analyze"),
+) -> dict:
+    """Get usage metrics aggregated by time interval."""
+    logs_dir = Path("logs")
+    all_entries: list[dict] = []
+    
+    if not logs_dir.exists():
+        return {
+            "metrics": [],
+            "interval_minutes": interval,
+            "hours_back": hours,
+            "total_buckets": 0,
+        }
+    
+    cutoff_date = datetime.now(timezone.utc) - timedelta(hours=hours)
+    
+    for log_file in sorted(logs_dir.glob("app_*.log")):
+        try:
+            file_date_str = log_file.stem.split("_")[1]
+            file_date = datetime.strptime(file_date_str, "%Y-%m-%d").replace(tzinfo=timezone.utc)
+            
+            if file_date < cutoff_date.replace(hour=0, minute=0, second=0, microsecond=0):
+                continue
+                
+            entries = _parse_log_file(log_file)
+            all_entries.extend(entries)
+        except Exception as e:
+            logger.error(f"Error processing log file {log_file}: {e}")
+            continue
+    
+    return _aggregate_metrics_by_time(all_entries, interval, hours)
+
+
+@admin_router.get("/api/usage/summary", dependencies=[Depends(require_admin_api)])
+async def get_usage_summary(
+    request: Request,
+    hours: int = Query(default=24, ge=1, le=168, description="Hours of history to analyze"),
+) -> dict:
+    """Get summary statistics for the specified time period."""
+    logs_dir = Path("logs")
+    all_entries: list[dict] = []
+    
+    if not logs_dir.exists():
+        return {
+            "total_entries": 0,
+            "total_requests": 0,
+            "successful_chat_completions": 0,
+            "failed_requests": 0,
+            "total_errors": 0,
+            "total_warnings": 0,
+            "payment_processed": 0,
+            "upstream_errors": 0,
+            "unique_models_count": 0,
+            "unique_models": [],
+            "error_types": {},
+            "success_rate": 0,
+        }
+    
+    cutoff_date = datetime.now(timezone.utc) - timedelta(hours=hours)
+    
+    for log_file in sorted(logs_dir.glob("app_*.log")):
+        try:
+            file_date_str = log_file.stem.split("_")[1]
+            file_date = datetime.strptime(file_date_str, "%Y-%m-%d").replace(tzinfo=timezone.utc)
+            
+            if file_date < cutoff_date.replace(hour=0, minute=0, second=0, microsecond=0):
+                continue
+                
+            entries = _parse_log_file(log_file)
+            all_entries.extend(entries)
+        except Exception as e:
+            logger.error(f"Error processing log file {log_file}: {e}")
+            continue
+    
+    return _get_summary_stats(all_entries, hours)
+
+
+@admin_router.get("/api/usage/error-details", dependencies=[Depends(require_admin_api)])
+async def get_error_details(
+    request: Request,
+    hours: int = Query(default=24, ge=1, le=168, description="Hours of history to analyze"),
+    limit: int = Query(default=100, ge=1, le=1000, description="Maximum number of errors to return"),
+) -> dict:
+    """Get detailed error information."""
+    logs_dir = Path("logs")
+    errors: list[dict] = []
+    
+    if not logs_dir.exists():
+        return {"errors": [], "total_count": 0}
+    
+    cutoff_date = datetime.now(timezone.utc) - timedelta(hours=hours)
+    
+    for log_file in sorted(logs_dir.glob("app_*.log"), reverse=True):
+        try:
+            file_date_str = log_file.stem.split("_")[1]
+            file_date = datetime.strptime(file_date_str, "%Y-%m-%d").replace(tzinfo=timezone.utc)
+            
+            if file_date < cutoff_date.replace(hour=0, minute=0, second=0, microsecond=0):
+                continue
+                
+            entries = _parse_log_file(log_file)
+            
+            for entry in entries:
+                if entry.get("levelname", "").upper() == "ERROR":
+                    timestamp_str = entry.get("asctime", "")
+                    if timestamp_str:
+                        log_time = datetime.strptime(timestamp_str, "%Y-%m-%d %H:%M:%S")
+                        log_time = log_time.replace(tzinfo=timezone.utc)
+                        
+                        if log_time >= cutoff_date:
+                            errors.append({
+                                "timestamp": timestamp_str,
+                                "message": entry.get("message", ""),
+                                "error_type": entry.get("error_type", "unknown"),
+                                "pathname": entry.get("pathname", ""),
+                                "lineno": entry.get("lineno", 0),
+                                "request_id": entry.get("request_id", ""),
+                            })
+                
+                if len(errors) >= limit:
+                    break
+                    
+        except Exception as e:
+            logger.error(f"Error processing log file {log_file}: {e}")
+            continue
+        
+        if len(errors) >= limit:
+            break
+    
+    errors.sort(key=lambda x: x["timestamp"], reverse=True)
+    
+    return {"errors": errors[:limit], "total_count": len(errors)}
diff --git a/routstr/core/main.py b/routstr/core/main.py
index b88be3cc..49d6e645 100644
--- a/routstr/core/main.py
+++ b/routstr/core/main.py
@@ -282,6 +282,15 @@ if UI_DIST_PATH.exists() and UI_DIST_PATH.is_dir():
     async def redirect_unauthorized_index_txt() -> RedirectResponse:
         return RedirectResponse("/unauthorized")
 
+    @app.get("/usage", include_in_schema=False)
+    async def serve_usage_ui() -> FileResponse:
+        return FileResponse(UI_DIST_PATH / "usage" / "index.html")
+
+    # Add explicit route for /usage/index.txt to redirect to /usage
+    @app.get("/usage/index.txt", include_in_schema=False)
+    async def redirect_usage_index_txt() -> RedirectResponse:
+        return RedirectResponse("/usage")
+
     @app.get("/favicon.ico", include_in_schema=False)
     async def serve_favicon() -> FileResponse:
         icon_path = UI_DIST_PATH / "icon.ico"
diff --git a/ui/app/usage/page.tsx b/ui/app/usage/page.tsx
new file mode 100644
index 00000000..3e0341d3
--- /dev/null
+++ b/ui/app/usage/page.tsx
@@ -0,0 +1,253 @@
+'use client';
+
+import { useState } from 'react';
+import { useQuery } from '@tanstack/react-query';
+import { AppSidebar } from '@/components/app-sidebar';
+import { SiteHeader } from '@/components/site-header';
+import { SidebarInset, SidebarProvider } from '@/components/ui/sidebar';
+import { UsageMetricsChart } from '@/components/usage-metrics-chart';
+import { UsageSummaryCards } from '@/components/usage-summary-cards';
+import { ErrorDetailsTable } from '@/components/error-details-table';
+import { AdminService } from '@/lib/api/services/admin';
+import { Button } from '@/components/ui/button';
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from '@/components/ui/select';
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import { RefreshCw } from 'lucide-react';
+
+export default function UsagePage() {
+  const [timeRange, setTimeRange] = useState('24');
+  const [interval, setInterval] = useState('15');
+
+  const {
+    data: metricsData,
+    isLoading: metricsLoading,
+    refetch: refetchMetrics,
+  } = useQuery({
+    queryKey: ['usage-metrics', interval, timeRange],
+    queryFn: () =>
+      AdminService.getUsageMetrics(parseInt(interval), parseInt(timeRange)),
+    refetchInterval: 60_000,
+    staleTime: 30_000,
+  });
+
+  const {
+    data: summaryData,
+    isLoading: summaryLoading,
+    refetch: refetchSummary,
+  } = useQuery({
+    queryKey: ['usage-summary', timeRange],
+    queryFn: () => AdminService.getUsageSummary(parseInt(timeRange)),
+    refetchInterval: 60_000,
+    staleTime: 30_000,
+  });
+
+  const {
+    data: errorData,
+    isLoading: errorLoading,
+    refetch: refetchErrors,
+  } = useQuery({
+    queryKey: ['usage-errors', timeRange],
+    queryFn: () => AdminService.getErrorDetails(parseInt(timeRange), 100),
+    refetchInterval: 60_000,
+    staleTime: 30_000,
+  });
+
+  const handleRefresh = () => {
+    refetchMetrics();
+    refetchSummary();
+    refetchErrors();
+  };
+
+  return (
+    <SidebarProvider>
+      <AppSidebar variant='inset' />
+      <SidebarInset className='p-0'>
+        <SiteHeader />
+        <div className='container max-w-7xl px-4 py-8 md:px-6 lg:px-8'>
+          <div className='mb-8 flex flex-col gap-4 lg:flex-row lg:items-start lg:justify-between'>
+            <div>
+              <h1 className='text-3xl font-bold tracking-tight'>
+                Usage Tracking
+              </h1>
+              <p className='text-muted-foreground mt-2'>
+                Monitor system usage, requests, and errors over time
+              </p>
+            </div>
+            <div className='flex items-center gap-4'>
+              <Select value={timeRange} onValueChange={setTimeRange}>
+                <SelectTrigger className='w-[180px]'>
+                  <SelectValue placeholder='Select time range' />
+                </SelectTrigger>
+                <SelectContent>
+                  <SelectItem value='1'>Last Hour</SelectItem>
+                  <SelectItem value='6'>Last 6 Hours</SelectItem>
+                  <SelectItem value='24'>Last 24 Hours</SelectItem>
+                  <SelectItem value='72'>Last 3 Days</SelectItem>
+                  <SelectItem value='168'>Last Week</SelectItem>
+                </SelectContent>
+              </Select>
+              <Select value={interval} onValueChange={setInterval}>
+                <SelectTrigger className='w-[180px]'>
+                  <SelectValue placeholder='Select interval' />
+                </SelectTrigger>
+                <SelectContent>
+                  <SelectItem value='5'>5 Minutes</SelectItem>
+                  <SelectItem value='15'>15 Minutes</SelectItem>
+                  <SelectItem value='30'>30 Minutes</SelectItem>
+                  <SelectItem value='60'>1 Hour</SelectItem>
+                </SelectContent>
+              </Select>
+              <Button onClick={handleRefresh} variant='outline' size='icon'>
+                <RefreshCw className='h-4 w-4' />
+              </Button>
+            </div>
+          </div>
+
+          <div className='space-y-6'>
+            {summaryLoading ? (
+              <div className='text-center py-8'>Loading summary...</div>
+            ) : summaryData ? (
+              <UsageSummaryCards summary={summaryData} />
+            ) : null}
+
+            <div className='grid gap-6 lg:grid-cols-2'>
+              {metricsLoading ? (
+                <div className='text-center py-8 col-span-2'>
+                  Loading metrics...
+                </div>
+              ) : metricsData && metricsData.metrics.length > 0 ? (
+                <>
+                  <UsageMetricsChart
+                    data={metricsData.metrics}
+                    title='Request Volume'
+                    dataKeys={[
+                      {
+                        key: 'total_requests',
+                        name: 'Total Requests',
+                        color: '#3b82f6',
+                      },
+                      {
+                        key: 'successful_chat_completions',
+                        name: 'Successful',
+                        color: '#10b981',
+                      },
+                      {
+                        key: 'failed_requests',
+                        name: 'Failed',
+                        color: '#ef4444',
+                      },
+                    ]}
+                  />
+                  <UsageMetricsChart
+                    data={metricsData.metrics}
+                    title='Error Tracking'
+                    dataKeys={[
+                      {
+                        key: 'errors',
+                        name: 'Errors',
+                        color: '#f97316',
+                      },
+                      {
+                        key: 'warnings',
+                        name: 'Warnings',
+                        color: '#eab308',
+                      },
+                      {
+                        key: 'upstream_errors',
+                        name: 'Upstream Errors',
+                        color: '#ef4444',
+                      },
+                    ]}
+                  />
+                  <UsageMetricsChart
+                    data={metricsData.metrics}
+                    title='Payment Activity'
+                    dataKeys={[
+                      {
+                        key: 'payment_processed',
+                        name: 'Payments Processed',
+                        color: '#6366f1',
+                      },
+                    ]}
+                  />
+                </>
+              ) : (
+                <Card className='col-span-2'>
+                  <CardHeader>
+                    <CardTitle>No Data Available</CardTitle>
+                  </CardHeader>
+                  <CardContent>
+                    <p className='text-muted-foreground'>
+                      No metrics data found for the selected time range. This
+                      could be because no requests have been logged yet or the
+                      log files are not available.
+                    </p>
+                  </CardContent>
+                </Card>
+              )}
+            </div>
+
+            {errorLoading ? (
+              <div className='text-center py-8'>Loading errors...</div>
+            ) : errorData ? (
+              <ErrorDetailsTable errors={errorData.errors} />
+            ) : null}
+
+            {summaryData && summaryData.unique_models.length > 0 && (
+              <Card>
+                <CardHeader>
+                  <CardTitle>Active Models</CardTitle>
+                </CardHeader>
+                <CardContent>
+                  <div className='flex flex-wrap gap-2'>
+                    {summaryData.unique_models.map((model) => (
+                      <span
+                        key={model}
+                        className='bg-secondary text-secondary-foreground inline-flex items-center rounded-md px-2.5 py-0.5 text-xs font-semibold'
+                      >
+                        {model}
+                      </span>
+                    ))}
+                  </div>
+                </CardContent>
+              </Card>
+            )}
+
+            {summaryData &&
+              summaryData.error_types &&
+              Object.keys(summaryData.error_types).length > 0 && (
+                <Card>
+                  <CardHeader>
+                    <CardTitle>Error Types Distribution</CardTitle>
+                  </CardHeader>
+                  <CardContent>
+                    <div className='space-y-2'>
+                      {Object.entries(summaryData.error_types)
+                        .sort(([, a], [, b]) => b - a)
+                        .map(([type, count]) => (
+                          <div
+                            key={type}
+                            className='flex items-center justify-between'
+                          >
+                            <span className='text-sm font-medium'>{type}</span>
+                            <span className='text-muted-foreground text-sm'>
+                              {count}
+                            </span>
+                          </div>
+                        ))}
+                    </div>
+                  </CardContent>
+                </Card>
+              )}
+          </div>
+        </div>
+      </SidebarInset>
+    </SidebarProvider>
+  );
+}
diff --git a/ui/components/app-sidebar.tsx b/ui/components/app-sidebar.tsx
index 70771d1f..5dc9879d 100644
--- a/ui/components/app-sidebar.tsx
+++ b/ui/components/app-sidebar.tsx
@@ -2,6 +2,7 @@
 
 import * as React from 'react';
 import {
+  ActivityIcon,
   DatabaseIcon,
   FileTextIcon,
   LayoutDashboardIcon,
@@ -35,6 +36,11 @@ const data = {
       url: '/',
       icon: LayoutDashboardIcon,
     },
+    {
+      title: 'Usage',
+      url: '/usage',
+      icon: ActivityIcon,
+    },
     {
       title: 'Models',
       url: '/model',
diff --git a/ui/components/error-details-table.tsx b/ui/components/error-details-table.tsx
new file mode 100644
index 00000000..5e51e810
--- /dev/null
+++ b/ui/components/error-details-table.tsx
@@ -0,0 +1,78 @@
+'use client';
+
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import {
+  Table,
+  TableBody,
+  TableCell,
+  TableHead,
+  TableHeader,
+  TableRow,
+} from '@/components/ui/table';
+import { Badge } from '@/components/ui/badge';
+import { ErrorDetail } from '@/lib/api/services/admin';
+
+interface ErrorDetailsTableProps {
+  errors: ErrorDetail[];
+}
+
+export function ErrorDetailsTable({ errors }: ErrorDetailsTableProps) {
+  if (errors.length === 0) {
+    return (
+      <Card>
+        <CardHeader>
+          <CardTitle>Recent Errors</CardTitle>
+        </CardHeader>
+        <CardContent>
+          <p className='text-muted-foreground text-center py-8'>
+            No errors found in the selected time period
+          </p>
+        </CardContent>
+      </Card>
+    );
+  }
+
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle>Recent Errors ({errors.length})</CardTitle>
+      </CardHeader>
+      <CardContent>
+        <div className='max-h-[400px] overflow-y-auto'>
+          <Table>
+            <TableHeader>
+              <TableRow>
+                <TableHead>Timestamp</TableHead>
+                <TableHead>Type</TableHead>
+                <TableHead>Message</TableHead>
+                <TableHead>Location</TableHead>
+                <TableHead>Request ID</TableHead>
+              </TableRow>
+            </TableHeader>
+            <TableBody>
+              {errors.map((error, index) => (
+                <TableRow key={index}>
+                  <TableCell className='font-mono text-xs'>
+                    {new Date(error.timestamp).toLocaleString()}
+                  </TableCell>
+                  <TableCell>
+                    <Badge variant='destructive'>{error.error_type}</Badge>
+                  </TableCell>
+                  <TableCell className='max-w-md truncate'>
+                    {error.message}
+                  </TableCell>
+                  <TableCell className='font-mono text-xs'>
+                    {error.pathname}:{error.lineno}
+                  </TableCell>
+                  <TableCell className='font-mono text-xs'>
+                    {error.request_id || '-'}
+                  </TableCell>
+                </TableRow>
+              ))}
+            </TableBody>
+          </Table>
+        </div>
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/ui/components/usage-metrics-chart.tsx b/ui/components/usage-metrics-chart.tsx
new file mode 100644
index 00000000..29059af6
--- /dev/null
+++ b/ui/components/usage-metrics-chart.tsx
@@ -0,0 +1,78 @@
+'use client';
+
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import {
+  Line,
+  LineChart,
+  ResponsiveContainer,
+  Tooltip,
+  XAxis,
+  YAxis,
+  Legend,
+  CartesianGrid,
+} from 'recharts';
+import { UsageMetricData } from '@/lib/api/services/admin';
+
+interface UsageMetricsChartProps {
+  data: UsageMetricData[];
+  title: string;
+  dataKeys: Array<{
+    key: keyof UsageMetricData;
+    name: string;
+    color: string;
+  }>;
+}
+
+export function UsageMetricsChart({
+  data,
+  title,
+  dataKeys,
+}: UsageMetricsChartProps) {
+  const formattedData = data.map((item) => ({
+    ...item,
+    time: new Date(item.timestamp).toLocaleTimeString([], {
+      hour: '2-digit',
+      minute: '2-digit',
+    }),
+  }));
+
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle>{title}</CardTitle>
+      </CardHeader>
+      <CardContent>
+        <ResponsiveContainer width='100%' height={300}>
+          <LineChart data={formattedData}>
+            <CartesianGrid strokeDasharray='3 3' className='stroke-muted' />
+            <XAxis
+              dataKey='time'
+              className='text-xs'
+              tick={{ fill: 'currentColor' }}
+            />
+            <YAxis className='text-xs' tick={{ fill: 'currentColor' }} />
+            <Tooltip
+              contentStyle={{
+                backgroundColor: 'hsl(var(--background))',
+                border: '1px solid hsl(var(--border))',
+                borderRadius: '6px',
+              }}
+            />
+            <Legend />
+            {dataKeys.map((dataKey) => (
+              <Line
+                key={dataKey.key}
+                type='monotone'
+                dataKey={dataKey.key}
+                stroke={dataKey.color}
+                name={dataKey.name}
+                strokeWidth={2}
+                dot={false}
+              />
+            ))}
+          </LineChart>
+        </ResponsiveContainer>
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/ui/components/usage-summary-cards.tsx b/ui/components/usage-summary-cards.tsx
new file mode 100644
index 00000000..d12224c2
--- /dev/null
+++ b/ui/components/usage-summary-cards.tsx
@@ -0,0 +1,86 @@
+'use client';
+
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import { UsageSummary } from '@/lib/api/services/admin';
+import {
+  CheckCircle2,
+  XCircle,
+  AlertTriangle,
+  Activity,
+  Database,
+  CreditCard,
+  TrendingUp,
+} from 'lucide-react';
+
+interface UsageSummaryCardsProps {
+  summary: UsageSummary;
+}
+
+export function UsageSummaryCards({ summary }: UsageSummaryCardsProps) {
+  const cards = [
+    {
+      title: 'Total Requests',
+      value: summary.total_requests.toLocaleString(),
+      icon: Activity,
+      color: 'text-blue-500',
+    },
+    {
+      title: 'Successful Completions',
+      value: summary.successful_chat_completions.toLocaleString(),
+      icon: CheckCircle2,
+      color: 'text-green-500',
+    },
+    {
+      title: 'Failed Requests',
+      value: summary.failed_requests.toLocaleString(),
+      icon: XCircle,
+      color: 'text-red-500',
+    },
+    {
+      title: 'Errors',
+      value: summary.total_errors.toLocaleString(),
+      icon: AlertTriangle,
+      color: 'text-orange-500',
+    },
+    {
+      title: 'Success Rate',
+      value: `${summary.success_rate.toFixed(1)}%`,
+      icon: TrendingUp,
+      color: 'text-emerald-500',
+    },
+    {
+      title: 'Unique Models',
+      value: summary.unique_models_count.toLocaleString(),
+      icon: Database,
+      color: 'text-purple-500',
+    },
+    {
+      title: 'Payments Processed',
+      value: summary.payment_processed.toLocaleString(),
+      icon: CreditCard,
+      color: 'text-indigo-500',
+    },
+    {
+      title: 'Upstream Errors',
+      value: summary.upstream_errors.toLocaleString(),
+      icon: AlertTriangle,
+      color: 'text-yellow-500',
+    },
+  ];
+
+  return (
+    <div className='grid gap-4 md:grid-cols-2 lg:grid-cols-4'>
+      {cards.map((card) => (
+        <Card key={card.title}>
+          <CardHeader className='flex flex-row items-center justify-between space-y-0 pb-2'>
+            <CardTitle className='text-sm font-medium'>{card.title}</CardTitle>
+            <card.icon className={`h-4 w-4 ${card.color}`} />
+          </CardHeader>
+          <CardContent>
+            <div className='text-2xl font-bold'>{card.value}</div>
+          </CardContent>
+        </Card>
+      ))}
+    </div>
+  );
+}
diff --git a/ui/lib/api/services/admin.ts b/ui/lib/api/services/admin.ts
index 9645a6a1..b0dc0cad 100644
--- a/ui/lib/api/services/admin.ts
+++ b/ui/lib/api/services/admin.ts
@@ -802,6 +802,30 @@ export class AdminService {
       '/admin/api/temporary-balances'
     );
   }
+
+  static async getUsageMetrics(
+    interval: number = 15,
+    hours: number = 24
+  ): Promise<UsageMetrics> {
+    return await apiClient.get<UsageMetrics>(
+      `/admin/api/usage/metrics?interval=${interval}&hours=${hours}`
+    );
+  }
+
+  static async getUsageSummary(hours: number = 24): Promise<UsageSummary> {
+    return await apiClient.get<UsageSummary>(
+      `/admin/api/usage/summary?hours=${hours}`
+    );
+  }
+
+  static async getErrorDetails(
+    hours: number = 24,
+    limit: number = 100
+  ): Promise<ErrorDetails> {
+    return await apiClient.get<ErrorDetails>(
+      `/admin/api/usage/error-details?hours=${hours}&limit=${limit}`
+    );
+  }
 }
 
 export const TemporaryBalanceSchema = z.object({
@@ -814,3 +838,50 @@ export const TemporaryBalanceSchema = z.object({
 });
 
 export type TemporaryBalance = z.infer<typeof TemporaryBalanceSchema>;
+
+export interface UsageMetricData {
+  timestamp: string;
+  total_requests: number;
+  successful_chat_completions: number;
+  failed_requests: number;
+  errors: number;
+  warnings: number;
+  payment_processed: number;
+  upstream_errors: number;
+}
+
+export interface UsageMetrics {
+  metrics: UsageMetricData[];
+  interval_minutes: number;
+  hours_back: number;
+  total_buckets: number;
+}
+
+export interface UsageSummary {
+  total_entries: number;
+  total_requests: number;
+  successful_chat_completions: number;
+  failed_requests: number;
+  total_errors: number;
+  total_warnings: number;
+  payment_processed: number;
+  upstream_errors: number;
+  unique_models_count: number;
+  unique_models: string[];
+  error_types: Record<string, number>;
+  success_rate: number;
+}
+
+export interface ErrorDetail {
+  timestamp: string;
+  message: string;
+  error_type: string;
+  pathname: string;
+  lineno: number;
+  request_id: string;
+}
+
+export interface ErrorDetails {
+  errors: ErrorDetail[];
+  total_count: number;
+}