diff --git a/PROGRESS-billing-pricing-20260830.md b/PROGRESS-billing-pricing-20260830.md
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+# 计费闭环与功能级定价进度（2026-08-30）
+
+## 任务 0 · 真实单位成本门控
+
+已完成只读聚合端点：`frontend/src/app/api/admin/usage/aggregate/route.ts`。
+
+- 权限：`billing.orders.read`
+- 窗口：最近 30 天
+- 输出：每个预留功能的 `runs`、`avg`、`p50`、`p95`、`max`，覆盖 `cost_microusd`、`input_tokens`、`output_tokens`、`duration_ms`
+- 无数据：`hasData=false`，统计值为 `null`，不会静默伪造为 0
+- `report.full`：当前账本 0 行，这是报告接入计费前的已知空缺
+
+### 当前可见数据库观测
+
+本机 `jyotisha-local-preview-postgres-1`（不是 staging/production）截至 2026-08-30 的最近 30 天账本：
+
+| feature_key | runs | cost p50 | cost p95 | input p50 | output p50 | duration p50 |
+|---|---:|---:|---:|---:|---:|---:|
+| `chat.standard` | 0 | 无实测数据 | 无实测数据 | 无实测数据 | 无实测数据 | 无实测数据 |
+| `rectification` | 3 | 0 | 0 | 110566 | 5835 | 52879 |
+| `report.full` | 0 | 无实测数据 | 无实测数据 | 无实测数据 | 无实测数据 | 无实测数据 |
+
+上述 3 条校正账本行的 `request_id` 都是 `rectification:case:<caseId>`，每个 case 只有 1 行。代码链路确认 `runV9AgentTurn` 在一次 agent run 结束时调用 `billing.complete({ ...outcome.usage, durationMs })`，而 `outcome.usage` 来自该次 run 的 `result.totalUsage`；它不是跨 case 多轮累计值。当前本机发布模型的 input/output 单价也都是 0，因此这组本地 cost=0 不能作为生产定价依据。
+
+**门控结论：未取得 staging/production 的非零真实单位成本，禁止写入任何新价格数字、会员公平使用数字或价格种子。**
+
+## 尚未执行
+
+任务 1–6 依赖任务 0 的真实成本口径；在取得可审计的 staging/production 聚合数据前，不接入会导致线上默认失败的空定价配置，也不修改商品售价或公平使用参数。
diff --git a/frontend/src/app/api/admin/usage/aggregate/route.ts b/frontend/src/app/api/admin/usage/aggregate/route.ts
new file mode 100644
index 00000000..26e567b8
--- /dev/null
+++ b/frontend/src/app/api/admin/usage/aggregate/route.ts
@@ -0,0 +1,119 @@
+import { NextResponse } from "next/server";
+
+import { requirePermission } from "@/lib/admin/auth";
+import { queryAdminRows } from "@/lib/admin/database";
+import { adminErrorResponse } from "@/lib/admin/http";
+
+export const runtime = "nodejs";
+
+const FEATURE_KEYS = [
+  "chat.standard",
+  "chat.premium",
+  "rectification",
+  "report.full",
+  "report.export",
+  "profile.extra",
+] as const;
+
+type FeatureKey = (typeof FEATURE_KEYS)[number];
+type AggregateRow = {
+  feature_key: FeatureKey;
+  runs: string;
+  avg_cost_microusd: string | null;
+  p50_cost_microusd: string | null;
+  p95_cost_microusd: string | null;
+  max_cost_microusd: string | null;
+  avg_input_tokens: string | null;
+  p50_input_tokens: string | null;
+  p95_input_tokens: string | null;
+  max_input_tokens: string | null;
+  avg_output_tokens: string | null;
+  p50_output_tokens: string | null;
+  p95_output_tokens: string | null;
+  max_output_tokens: string | null;
+  avg_duration_ms: string | null;
+  p50_duration_ms: string | null;
+  p95_duration_ms: string | null;
+  max_duration_ms: string | null;
+};
+
+type Metric = {
+  runs: number;
+  avg: number | null;
+  p50: number | null;
+  p95: number | null;
+  max: number | null;
+};
+
+function numberOrNull(value: string | null): number | null {
+  return value === null ? null : Number(value);
+}
+
+function metric(
+  row: AggregateRow,
+  avg: keyof AggregateRow,
+  p50: keyof AggregateRow,
+  p95: keyof AggregateRow,
+  max: keyof AggregateRow,
+): Metric {
+  return {
+    runs: Number(row.runs),
+    avg: numberOrNull(row[avg] as string | null),
+    p50: numberOrNull(row[p50] as string | null),
+    p95: numberOrNull(row[p95] as string | null),
+    max: numberOrNull(row[max] as string | null),
+  };
+}
+
+export async function GET() {
+  try {
+    await requirePermission("billing.orders.read");
+    const rows = await queryAdminRows<AggregateRow>(`
+      with feature_keys(feature_key) as (
+        select unnest($1::text[])
+      ), recent as (
+        select feature_key, cost_microusd, input_tokens, output_tokens, duration_ms
+        from public.usage_ledger
+        where created_at >= now() - interval '30 days'
+      )
+      select f.feature_key,
+        count(r.feature_key)::text as runs,
+        avg(r.cost_microusd)::text as avg_cost_microusd,
+        percentile_cont(0.50) within group(order by r.cost_microusd)::text as p50_cost_microusd,
+        percentile_cont(0.95) within group(order by r.cost_microusd)::text as p95_cost_microusd,
+        max(r.cost_microusd)::text as max_cost_microusd,
+        avg(r.input_tokens)::text as avg_input_tokens,
+        percentile_cont(0.50) within group(order by r.input_tokens)::text as p50_input_tokens,
+        percentile_cont(0.95) within group(order by r.input_tokens)::text as p95_input_tokens,
+        max(r.input_tokens)::text as max_input_tokens,
+        avg(r.output_tokens)::text as avg_output_tokens,
+        percentile_cont(0.50) within group(order by r.output_tokens)::text as p50_output_tokens,
+        percentile_cont(0.95) within group(order by r.output_tokens)::text as p95_output_tokens,
+        max(r.output_tokens)::text as max_output_tokens,
+        avg(r.duration_ms)::text as avg_duration_ms,
+        percentile_cont(0.50) within group(order by r.duration_ms)::text as p50_duration_ms,
+        percentile_cont(0.95) within group(order by r.duration_ms)::text as p95_duration_ms,
+        max(r.duration_ms)::text as max_duration_ms
+      from feature_keys f
+      left join recent r on r.feature_key=f.feature_key
+      group by f.feature_key
+      order by f.feature_key
+    `, [FEATURE_KEYS]);
+
+    return NextResponse.json({
+      window: { days: 30, since: new Date(Date.now() - 30 * 24 * 60 * 60 * 1000).toISOString() },
+      data: rows.map((row) => ({
+        featureKey: row.feature_key,
+        hasData: Number(row.runs) > 0,
+        metrics: {
+          costMicrousd: metric(row, "avg_cost_microusd", "p50_cost_microusd", "p95_cost_microusd", "max_cost_microusd"),
+          inputTokens: metric(row, "avg_input_tokens", "p50_input_tokens", "p95_input_tokens", "max_input_tokens"),
+          outputTokens: metric(row, "avg_output_tokens", "p50_output_tokens", "p95_output_tokens", "max_output_tokens"),
+          durationMs: metric(row, "avg_duration_ms", "p50_duration_ms", "p95_duration_ms", "max_duration_ms"),
+        },
+      })),
+    });
+  } catch (error) {
+    return adminErrorResponse(error);
+  }
+}
diff --git a/frontend/tests/admin-usage-aggregate-contract.test.ts b/frontend/tests/admin-usage-aggregate-contract.test.ts
new file mode 100644
index 00000000..f88433e7
--- /dev/null
+++ b/frontend/tests/admin-usage-aggregate-contract.test.ts
@@ -0,0 +1,16 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+const route = readFileSync(resolve("src/app/api/admin/usage/aggregate/route.ts"), "utf8");
+
+test("admin usage aggregate is a read-only 30-day billing report", () => {
+  assert.match(route, /requirePermission\("billing\.orders\.read"\)/);
+  assert.match(route, /interval '30 days'/);
+  assert.match(route, /percentile_cont\(0\.50\)/);
+  assert.match(route, /percentile_cont\(0\.95\)/);
+  assert.match(route, /hasData/);
+  assert.match(route, /report\.full/);
+  assert.doesNotMatch(route, /export async function POST/);
+});