diff --git a/app/api/lotto/debug/route.ts b/app/api/lotto/debug/route.ts
new file mode 100644
index 0000000..149e80a
--- /dev/null
+++ b/app/api/lotto/debug/route.ts
@@ -0,0 +1,66 @@
+import { NextResponse } from 'next/server';
+
+/**
+ * GET /api/lotto/debug
+ * NAS 엔드포인트 접근 가능 여부 일괄 진단
+ * 배포 후 브라우저에서 직접 호출: https://www.jaengseung-made.com/api/lotto/debug
+ */
+export async function GET() {
+  const base = process.env.NAS_LOTTO_API_URL;
+  if (!base) return NextResponse.json({ error: 'NAS_URL_NOT_CONFIGURED' }, { status: 500 });
+
+  const paths = [
+    // 현재 코드에서 호출 중인 경로들
+    '/api/lotto/recommend',
+    '/api/lotto/recommend/batch',
+    '/api/lotto/latest',
+    '/api/lotto/analysis',
+    '/api/lotto/simulation',
+    '/api/lotto/stats',
+    '/api/lotto/stats/performance',
+    '/api/lotto/report/latest',
+    '/api/lotto/report/history',
+    '/api/lotto/purchase',
+    '/api/lotto/purchase/stats',
+    '/api/lotto/analysis/personal',
+    '/api/history',
+    // NAS API 스펙 문서
+    '/openapi.json',
+    '/docs',
+  ];
+
+  const results = await Promise.all(
+    paths.map(async (path) => {
+      const start = Date.now();
+      try {
+        const res = await fetch(`${base}${path}`, {
+          signal: AbortSignal.timeout(6000),
+        });
+        const ms = Date.now() - start;
+        let body: unknown = null;
+        try { body = await res.json(); } catch { /* ignore */ }
+        return { path, status: res.status, ok: res.ok, ms, body };
+      } catch (err) {
+        const e = err as { name?: string; message?: string; code?: string };
+        return {
+          path,
+          status: null,
+          ok: false,
+          ms: Date.now() - start,
+          error: e.code ?? e.name ?? e.message,
+        };
+      }
+    })
+  );
+
+  const ok = results.filter(r => r.ok);
+  const fail = results.filter(r => !r.ok);
+
+  return NextResponse.json({
+    base,
+    summary: { total: results.length, ok: ok.length, fail: fail.length },
+    ok: ok.map(r => ({ path: r.path, status: r.status, ms: r.ms })),
+    fail: fail.map(r => ({ path: r.path, status: r.status, error: (r as { error?: string }).error, ms: r.ms })),
+    full: results,
+  });
+}