diff --git a/config/webVersion.ts b/config/webVersion.ts
index 87a6129..72a34ce 100644
--- a/config/webVersion.ts
+++ b/config/webVersion.ts
@@ -6,5 +6,5 @@
 2: Patch oder Hotfix (Bugfixes oder kleine Änderungen).
 
 */
-const webVersion = "1.6.230";
+const webVersion = "1.6.231";
 export default webVersion;
diff --git a/pages/api/cpl/tdrReferenceCurveAPIHandler.ts b/pages/api/cpl/tdrReferenceCurveAPIHandler.ts
new file mode 100644
index 0000000..6bade55
--- /dev/null
+++ b/pages/api/cpl/tdrReferenceCurveAPIHandler.ts
@@ -0,0 +1,25 @@
+// /api/cpl/tdrReferenceCurveAPIHandler.ts
+import { NextApiRequest, NextApiResponse } from "next";
+import path from "path";
+import { promises as fs } from "fs";
+
+export default async function handler(
+  req: NextApiRequest,
+  res: NextApiResponse
+) {
+  const { slot } = req.query;
+
+  const filePath = path.join(
+    process.cwd(),
+    "apiMockData",
+    "tdr-reference-curves",
+    `slot${slot}.json`
+  );
+
+  try {
+    const fileContent = await fs.readFile(filePath, "utf-8");
+    res.status(200).json(JSON.parse(fileContent));
+  } catch (error) {
+    res.status(404).json({ error: "File not found" });
+  }
+}
diff --git a/services/fetchTDRReferenceCurveService.ts b/services/fetchTDRReferenceCurveService.ts
index 477d60e..4bfc0e7 100644
--- a/services/fetchTDRReferenceCurveService.ts
+++ b/services/fetchTDRReferenceCurveService.ts
@@ -13,7 +13,7 @@ export const fetchTDRReferenceCurveService = async (
   // 🔁 Fallback: Datei oder Produktion-API
   const isDev = process.env.NEXT_PUBLIC_NODE_ENV === "development";
   const url = isDev
-    ? `/api/cpl/tdr-reference-curves/slot${slot}.json`
+    ? `/api/cpl/tdrReferenceCurveAPIHandler?slot=${slot}`
     : `${window.location.origin}/CPL?Service/empty.acp&TDR=${slot}`;
 
   try {