diff --git a/pages/api/sum.ts b/pages/api/sum.ts
new file mode 100644
index 0000000..7862c36
--- /dev/null
+++ b/pages/api/sum.ts
@@ -0,0 +1,9 @@
+import type { NextApiRequest, NextApiResponse } from "next";
+import { sum } from "@/pages/utils/sum";
+
+export default function handler(req: NextApiRequest, res: NextApiResponse) {
+  const { num1, num2 } = req.query;
+  const result = sum(num1, num2);
+
+  res.status(200).json({ total: result });
+}
diff --git a/pages/utils/sum.ts b/pages/utils/sum.ts
new file mode 100644
index 0000000..4f08039
--- /dev/null
+++ b/pages/utils/sum.ts
@@ -0,0 +1,8 @@
+export function sum(a: number, b: number, format: "html" | "text" = "html") {
+  const result = a + b;
+  if (format === "html") {
+    return `<span>${result}</span>`;
+  } else {
+    return result;
+  }
+}