fix: #367 failed to fetch account usage

app/requests.ts

@@ -48,6 +48,7 @@ export function requestOpenaiClient(path: string) {
       method,
       headers: {
         "Content-Type": "application/json",
+        "Cache-Control": "no-cache",
         path,
         ...getHeaders(),
       },
@@ -69,17 +70,25 @@ export async function requestChat(messages: Message[]) {
 }
 
 export async function requestUsage() {
+  const formatDate = (d: Date) =>
+    `${d.getFullYear()}-${(d.getMonth() + 1).toString().padStart(2, "0")}-${d
+      .getDate()
+      .toString()
+      .padStart(2, "0")}`;
+  const ONE_DAY = 24 * 60 * 60 * 1000;
+  const now = new Date(Date.now() + ONE_DAY);
+  const startOfMonth = new Date(now.getFullYear(), now.getMonth(), 1);
+  const startDate = formatDate(startOfMonth);
+  const endDate = formatDate(now);
   const res = await requestOpenaiClient(
-    "dashboard/billing/credit_grants?_vercel_no_cache=1",
+    `dashboard/billing/usage?start_date=${startDate}&end_date=${endDate}`,
   )(null, "GET");
 
   try {
     const response = (await res.json()) as {
-      total_available: number;
-      total_granted: number;
-      total_used: number;
+      total_usage: number;
     };
-    return response;
+    return Math.round(response.total_usage) / 100;
   } catch (error) {
     console.error("[Request usage] ", error, res.body);
   }