diff --git a/backend/src/routes/admin.ts b/backend/src/routes/admin.ts
index 1b757b6..7b1a8c7 100644
--- a/backend/src/routes/admin.ts
+++ b/backend/src/routes/admin.ts
@@ -208,12 +208,23 @@ router.get(
 			prisma.$queryRaw`SELECT COUNT(*) as total, COUNT(CASE WHEN status = 'PENDING' THEN 1 END) as pending, COUNT(CASE WHEN status = 'APPROVED' THEN 1 END) as approved, COUNT(CASE WHEN status = 'DECLINED' THEN 1 END) as declined FROM content_requests`,
 			prisma.$queryRaw`SELECT DATE(created_at) as date, COUNT(DISTINCT user_id) as active_users, SUM(CASE WHEN type = 'EARN' THEN amount ELSE 0 END) as earned, SUM(CASE WHEN type = 'SPEND' THEN amount ELSE 0 END) as spent FROM transactions WHERE created_at >= ${thirtyDaysAgo} GROUP BY DATE(created_at) ORDER BY date DESC LIMIT 30`,
 		]);
+
+		// Cast BigInt to Number for JSON serialization
+		const cast = (obj: any) => {
+			if (!obj) return obj;
+			const res: any = {};
+			for (const key of Object.keys(obj)) {
+				res[key] = typeof obj[key] === "bigint" ? Number(obj[key]) : obj[key];
+			}
+			return res;
+		};
+
 		res.json({
-			users: userStats[0],
-			transactions: transactionStats[0],
-			watchStats: watchStats[0],
-			requests: requestStats[0],
-			dailyActivity,
+			users: cast(userStats[0]),
+			transactions: cast(transactionStats[0]),
+			watchStats: cast(watchStats[0]),
+			requests: cast(requestStats[0]),
+			dailyActivity: (dailyActivity as any[]).map(cast),
 		});
 	}),
 );