diff --git a/src/lib/useLoadLatestVerified.ts b/src/lib/useLoadLatestVerified.ts
index 4a0a4890..377a4c74 100644
--- a/src/lib/useLoadLatestVerified.ts
+++ b/src/lib/useLoadLatestVerified.ts
@@ -1,25 +1,30 @@
 import { useQuery } from "@tanstack/react-query";
 
-import { randomFromArray, backends } from "./useSubmitSources";
+import { randomFromArray, useBackends } from "./useSubmitSources";
 
 export function useLoadLatestVerified() {
+  const backends = useBackends();
   const backend = randomFromArray(backends);
 
-  const { isLoading, error, data } = useQuery(["latestVerifiedContracts"], async () => {
-    const response = await fetch(`${backend}/latestVerified`, {
-      method: "GET",
-    });
+  const { isLoading, error, data } = useQuery(
+    ["latestVerifiedContracts"],
+    async () => {
+      const response = await fetch(`${backend}/latestVerified`, {
+        method: "GET",
+      });
 
-    const latestVerified = (
-      (await response.json()) as {
-        address: string;
-        mainFile: string;
-        compiler: string;
-      }[]
-    ).slice(0, 100);
+      const latestVerified = (
+        (await response.json()) as {
+          address: string;
+          mainFile: string;
+          compiler: string;
+        }[]
+      ).slice(0, 100);
 
-    return latestVerified;
-  });
+      return latestVerified;
+    },
+    { enabled: backends.length > 0 },
+  );
 
   return { isLoading, error, data };
 }
diff --git a/src/lib/useOverride.ts b/src/lib/useOverride.ts
index 68d1f18b..c4b1d42a 100644
--- a/src/lib/useOverride.ts
+++ b/src/lib/useOverride.ts
@@ -16,6 +16,11 @@ export function useOverride() {
     (async () => {
       if (!walletAddress || !contractAddress) return;
       if (urlParams.get("override") !== null) {
+        if (!!import.meta.env.VITE_OVERRIDE) {
+          setCanOverride(true);
+          return;
+        }
+
         const tc = await getClient();
         const admin = await getAdmin(Address.parse(window.sourcesRegistryAddress), tc);
         if (admin === walletAddress) {
diff --git a/src/lib/useRemoteConfig.ts b/src/lib/useRemoteConfig.ts
index 800564cc..6852aef2 100644
--- a/src/lib/useRemoteConfig.ts
+++ b/src/lib/useRemoteConfig.ts
@@ -10,16 +10,27 @@ export function useRemoteConfig() {
   return useQuery(
     ["remoteConfig"],
     async () => {
-      const { funcVersions, tactVersions, tolkVersions } = await (await fetch(configURL)).json();
+      const config: {
+        funcVersions: string[];
+        tactVersions: string[];
+        tolkVersions: string[];
+        backends: string[];
+        backendsTestnet: string[];
+      } = await (await fetch(configURL)).json();
 
       setEnabled(false);
 
-      return {
-        funcVersions: funcVersions as string[],
-        tactVersions: tactVersions as string[],
-        tolkVersions: tolkVersions as string[],
-      };
+      return config;
+    },
+    {
+      enabled,
+      initialData: {
+        funcVersions: [],
+        tactVersions: [],
+        tolkVersions: [],
+        backends: [],
+        backendsTestnet: [],
+      },
     },
-    { enabled, initialData: { funcVersions: [], tactVersions: [], tolkVersions: [] } },
   );
 }
diff --git a/src/lib/useSubmitSources.ts b/src/lib/useSubmitSources.ts
index 64ebd1e8..6aaafaa7 100644
--- a/src/lib/useSubmitSources.ts
+++ b/src/lib/useSubmitSources.ts
@@ -9,6 +9,7 @@ import { AnalyticsAction, sendAnalyticsEvent } from "./googleAnalytics";
 import create from "zustand";
 import { useLoadVerifierRegistryInfo } from "./useLoadVerifierRegistryInfo";
 import { useTonAddress } from "@tonconnect/ui-react";
+import { useRemoteConfig } from "./useRemoteConfig";
 
 export function randomFromArray<T>(arr: T[]) {
   return arr[Math.floor(Math.random() * arr.length)];
@@ -35,9 +36,7 @@ function jsonToBlob(json: Record<string, any>): Blob {
   });
 }
 
-export const backends: string[] = window.isTestnet
-  ? import.meta.env.VITE_BACKEND_URL_TESTNET!.split(",")
-  : import.meta.env.VITE_BACKEND_URL!.split(",");
+const isTestnet = window.isTestnet;
 
 const useSubmitSourcesStatusStore = create<{
   status: string | null;
@@ -49,6 +48,22 @@ const useSubmitSourcesStatusStore = create<{
   clear: () => set({ status: null }),
 }));
 
+export function useBackends() {
+  const { data: remoteConfig } = useRemoteConfig();
+
+  let backends: string[] = [];
+
+  if (!!import.meta.env.VITE_BACKEND_URL_OVERRIDE) {
+    backends = import.meta.env.VITE_BACKEND_URL_OVERRIDE.split(",");
+  } else if (isTestnet) {
+    backends = remoteConfig.backendsTestnet;
+  } else {
+    backends = remoteConfig.backends;
+  }
+
+  return backends;
+}
+
 export function useSubmitSources() {
   const { contractAddress } = useContractAddress();
   const { data: contractInfo } = useLoadContractInfo();
@@ -57,6 +72,7 @@ export function useSubmitSources() {
   const walletAddress = useTonAddress();
   const { clear, setStatus, status } = useSubmitSourcesStatusStore();
   const { data: verifierRegistryData } = useLoadVerifierRegistryInfo();
+  const backends = useBackends();
 
   const verifierRegistryConfig = verifierRegistryData?.find((v) => v.name === window.verifierId);
 
@@ -68,6 +84,7 @@ export function useSubmitSources() {
     if (!walletAddress) {
       throw new Error("Wallet is not connected");
     }
+    if (backends.length === 0) return;
 
     clear();