diff --git a/global.d.ts b/global.d.ts
index 059e47732..7f7dd832f 100644
--- a/global.d.ts
+++ b/global.d.ts
@@ -8,7 +8,21 @@ declare const __USE_PROD_CONFIG__: boolean
 interface Window {
   __CONFIG__: {
     mixpanel_token?: string
+    require_whitelist?: boolean
     subscription_required?: boolean
+    max_upload_size?: number
+    comfy_api_base_url?: string
+    comfy_platform_base_url?: string
+    firebase_config?: {
+      apiKey: string
+      authDomain: string
+      databaseURL?: string
+      projectId: string
+      storageBucket: string
+      messagingSenderId: string
+      appId: string
+      measurementId?: string
+    }
     server_health_alert?: {
       message: string
       tooltip?: string
diff --git a/src/components/dialog/content/SignInContent.vue b/src/components/dialog/content/SignInContent.vue
index 19da83125..0cc9869c4 100644
--- a/src/components/dialog/content/SignInContent.vue
+++ b/src/components/dialog/content/SignInContent.vue
@@ -96,7 +96,7 @@
         <small class="text-center text-muted">
           {{ t('auth.apiKey.helpText') }}
           <a
-            :href="`${COMFY_PLATFORM_BASE_URL}/login`"
+            :href="`${comfyPlatformBaseUrl}/login`"
             target="_blank"
             class="cursor-pointer text-blue-500"
           >
@@ -145,11 +145,15 @@
 import Button from 'primevue/button'
 import Divider from 'primevue/divider'
 import Message from 'primevue/message'
-import { onMounted, onUnmounted, ref } from 'vue'
+import { computed, onMounted, onUnmounted, ref } from 'vue'
 import { useI18n } from 'vue-i18n'
 
 import { useFirebaseAuthActions } from '@/composables/auth/useFirebaseAuthActions'
-import { COMFY_PLATFORM_BASE_URL } from '@/config/comfyApi'
+import { getComfyPlatformBaseUrl } from '@/config/comfyApi'
+import {
+  configValueOrDefault,
+  remoteConfig
+} from '@/platform/remoteConfig/remoteConfig'
 import type { SignInData, SignUpData } from '@/schemas/signInSchema'
 import { isHostWhitelisted, normalizeHost } from '@/utils/hostWhitelist'
 import { isInChina } from '@/utils/networkUtil'
@@ -168,6 +172,13 @@ const isSecureContext = window.isSecureContext
 const isSignIn = ref(true)
 const showApiKeyForm = ref(false)
 const ssoAllowed = isHostWhitelisted(normalizeHost(window.location.hostname))
+const comfyPlatformBaseUrl = computed(() =>
+  configValueOrDefault(
+    remoteConfig.value,
+    'comfy_platform_base_url',
+    getComfyPlatformBaseUrl()
+  )
+)
 
 const toggleState = () => {
   isSignIn.value = !isSignIn.value
diff --git a/src/components/dialog/content/signin/ApiKeyForm.test.ts b/src/components/dialog/content/signin/ApiKeyForm.test.ts
index bf1ec2cdd..f5ba33411 100644
--- a/src/components/dialog/content/signin/ApiKeyForm.test.ts
+++ b/src/components/dialog/content/signin/ApiKeyForm.test.ts
@@ -9,7 +9,7 @@ import { beforeEach, describe, expect, it, vi } from 'vitest'
 import { createApp } from 'vue'
 import { createI18n } from 'vue-i18n'
 
-import { COMFY_PLATFORM_BASE_URL } from '@/config/comfyApi'
+import { getComfyPlatformBaseUrl } from '@/config/comfyApi'
 
 import ApiKeyForm from './ApiKeyForm.vue'
 
@@ -111,7 +111,7 @@ describe('ApiKeyForm', () => {
     const helpText = wrapper.find('small')
     expect(helpText.text()).toContain('Need an API key?')
     expect(helpText.find('a').attributes('href')).toBe(
-      `${COMFY_PLATFORM_BASE_URL}/login`
+      `${getComfyPlatformBaseUrl()}/login`
     )
   })
 })
diff --git a/src/components/dialog/content/signin/ApiKeyForm.vue b/src/components/dialog/content/signin/ApiKeyForm.vue
index 2e70345fc..027f35b6d 100644
--- a/src/components/dialog/content/signin/ApiKeyForm.vue
+++ b/src/components/dialog/content/signin/ApiKeyForm.vue
@@ -48,7 +48,7 @@
           <small class="text-muted">
             {{ t('auth.apiKey.helpText') }}
             <a
-              :href="`${COMFY_PLATFORM_BASE_URL}/login`"
+              :href="`${comfyPlatformBaseUrl}/login`"
               target="_blank"
               class="cursor-pointer text-blue-500"
             >
@@ -88,7 +88,11 @@ import Message from 'primevue/message'
 import { computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 
-import { COMFY_PLATFORM_BASE_URL } from '@/config/comfyApi'
+import { getComfyPlatformBaseUrl } from '@/config/comfyApi'
+import {
+  configValueOrDefault,
+  remoteConfig
+} from '@/platform/remoteConfig/remoteConfig'
 import { apiKeySchema } from '@/schemas/signInSchema'
 import { useApiKeyAuthStore } from '@/stores/apiKeyAuthStore'
 import { useFirebaseAuthStore } from '@/stores/firebaseAuthStore'
@@ -96,6 +100,13 @@ import { useFirebaseAuthStore } from '@/stores/firebaseAuthStore'
 const authStore = useFirebaseAuthStore()
 const apiKeyStore = useApiKeyAuthStore()
 const loading = computed(() => authStore.loading)
+const comfyPlatformBaseUrl = computed(() =>
+  configValueOrDefault(
+    remoteConfig.value,
+    'comfy_platform_base_url',
+    getComfyPlatformBaseUrl()
+  )
+)
 
 const { t } = useI18n()
 
diff --git a/src/config/comfyApi.ts b/src/config/comfyApi.ts
index 272708264..8efd651bf 100644
--- a/src/config/comfyApi.ts
+++ b/src/config/comfyApi.ts
@@ -1,7 +1,43 @@
-export const COMFY_API_BASE_URL = __USE_PROD_CONFIG__
-  ? 'https://api.comfy.org'
-  : 'https://stagingapi.comfy.org'
+import { isCloud } from '@/platform/distribution/types'
+import {
+  configValueOrDefault,
+  remoteConfig
+} from '@/platform/remoteConfig/remoteConfig'
 
-export const COMFY_PLATFORM_BASE_URL = __USE_PROD_CONFIG__
-  ? 'https://platform.comfy.org'
-  : 'https://stagingplatform.comfy.org'
+const PROD_API_BASE_URL = 'https://api.comfy.org'
+const STAGING_API_BASE_URL = 'https://stagingapi.comfy.org'
+
+const PROD_PLATFORM_BASE_URL = 'https://platform.comfy.org'
+const STAGING_PLATFORM_BASE_URL = 'https://stagingplatform.comfy.org'
+
+const BUILD_TIME_API_BASE_URL = __USE_PROD_CONFIG__
+  ? PROD_API_BASE_URL
+  : STAGING_API_BASE_URL
+
+const BUILD_TIME_PLATFORM_BASE_URL = __USE_PROD_CONFIG__
+  ? PROD_PLATFORM_BASE_URL
+  : STAGING_PLATFORM_BASE_URL
+
+export function getComfyApiBaseUrl(): string {
+  if (!isCloud) {
+    return BUILD_TIME_API_BASE_URL
+  }
+
+  return configValueOrDefault(
+    remoteConfig.value,
+    'comfy_api_base_url',
+    BUILD_TIME_API_BASE_URL
+  )
+}
+
+export function getComfyPlatformBaseUrl(): string {
+  if (!isCloud) {
+    return BUILD_TIME_PLATFORM_BASE_URL
+  }
+
+  return configValueOrDefault(
+    remoteConfig.value,
+    'comfy_platform_base_url',
+    BUILD_TIME_PLATFORM_BASE_URL
+  )
+}
diff --git a/src/config/firebase.ts b/src/config/firebase.ts
index e5fbd2af7..e976a2ef6 100644
--- a/src/config/firebase.ts
+++ b/src/config/firebase.ts
@@ -1,5 +1,8 @@
 import type { FirebaseOptions } from 'firebase/app'
 
+import { isCloud } from '@/platform/distribution/types'
+import { remoteConfig } from '@/platform/remoteConfig/remoteConfig'
+
 const DEV_CONFIG: FirebaseOptions = {
   apiKey: 'AIzaSyDa_YMeyzV0SkVe92vBZ1tVikWBmOU5KVE',
   authDomain: 'dreamboothy-dev.firebaseapp.com',
@@ -22,7 +25,18 @@ const PROD_CONFIG: FirebaseOptions = {
   measurementId: 'G-3ZBD3MBTG4'
 }
 
-// To test with prod config while using dev server, set USE_PROD_CONFIG=true in .env
-export const FIREBASE_CONFIG: FirebaseOptions = __USE_PROD_CONFIG__
-  ? PROD_CONFIG
-  : DEV_CONFIG
+const BUILD_TIME_CONFIG = __USE_PROD_CONFIG__ ? PROD_CONFIG : DEV_CONFIG
+
+/**
+ * Returns the Firebase configuration for the current environment.
+ * - Cloud builds use runtime configuration delivered via feature flags
+ * - OSS / localhost builds fall back to the build-time config determined by __USE_PROD_CONFIG__
+ */
+export function getFirebaseConfig(): FirebaseOptions {
+  if (!isCloud) {
+    return BUILD_TIME_CONFIG
+  }
+
+  const runtimeConfig = remoteConfig.value.firebase_config
+  return runtimeConfig ?? BUILD_TIME_CONFIG
+}
diff --git a/src/main.ts b/src/main.ts
index e063bc18c..659198d53 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -11,7 +11,7 @@ import Tooltip from 'primevue/tooltip'
 import { createApp } from 'vue'
 import { VueFire, VueFireAuth } from 'vuefire'
 
-import { FIREBASE_CONFIG } from '@/config/firebase'
+import { getFirebaseConfig } from '@/config/firebase'
 import '@/lib/litegraph/public/css/litegraph.css'
 import router from '@/router'
 
@@ -40,7 +40,7 @@ const ComfyUIPreset = definePreset(Aura, {
   }
 })
 
-const firebaseApp = initializeApp(FIREBASE_CONFIG)
+const firebaseApp = initializeApp(getFirebaseConfig())
 
 const app = createApp(App)
 const pinia = createPinia()
diff --git a/src/platform/cloud/subscription/composables/useSubscription.ts b/src/platform/cloud/subscription/composables/useSubscription.ts
index 92588907f..b622cb97a 100644
--- a/src/platform/cloud/subscription/composables/useSubscription.ts
+++ b/src/platform/cloud/subscription/composables/useSubscription.ts
@@ -4,7 +4,7 @@ import { createSharedComposable } from '@vueuse/core'
 import { useCurrentUser } from '@/composables/auth/useCurrentUser'
 import { useFirebaseAuthActions } from '@/composables/auth/useFirebaseAuthActions'
 import { useErrorHandling } from '@/composables/useErrorHandling'
-import { COMFY_API_BASE_URL } from '@/config/comfyApi'
+import { getComfyApiBaseUrl, getComfyPlatformBaseUrl } from '@/config/comfyApi'
 import { MONTHLY_SUBSCRIPTION_PRICE } from '@/config/subscriptionPricesConfig'
 import { t } from '@/i18n'
 import { isCloud } from '@/platform/distribution/types'
@@ -74,6 +74,8 @@ function useSubscriptionInternal() {
     () => `$${MONTHLY_SUBSCRIPTION_PRICE.toFixed(0)}`
   )
 
+  const buildApiUrl = (path: string) => `${getComfyApiBaseUrl()}${path}`
+
   const fetchStatus = wrapWithErrorHandlingAsync(
     fetchSubscriptionStatus,
     reportError
@@ -114,7 +116,7 @@ function useSubscriptionInternal() {
   }
 
   const handleViewUsageHistory = () => {
-    window.open('https://platform.comfy.org/profile/usage', '_blank')
+    window.open(`${getComfyPlatformBaseUrl()}/profile/usage`, '_blank')
   }
 
   const handleLearnMore = () => {
@@ -136,7 +138,7 @@ function useSubscriptionInternal() {
     }
 
     const response = await fetch(
-      `${COMFY_API_BASE_URL}/customers/cloud-subscription-status`,
+      buildApiUrl('/customers/cloud-subscription-status'),
       {
         headers: {
           ...authHeader,
@@ -181,7 +183,7 @@ function useSubscriptionInternal() {
       }
 
       const response = await fetch(
-        `${COMFY_API_BASE_URL}/customers/cloud-subscription-checkout`,
+        buildApiUrl('/customers/cloud-subscription-checkout'),
         {
           method: 'POST',
           headers: {
diff --git a/src/platform/remoteConfig/remoteConfig.ts b/src/platform/remoteConfig/remoteConfig.ts
index a20eb7ebd..7d8f28c5f 100644
--- a/src/platform/remoteConfig/remoteConfig.ts
+++ b/src/platform/remoteConfig/remoteConfig.ts
@@ -21,6 +21,15 @@ import type { RemoteConfig } from './types'
  */
 export const remoteConfig = ref<RemoteConfig>({})
 
+export function configValueOrDefault<K extends keyof RemoteConfig>(
+  remoteConfig: RemoteConfig,
+  key: K,
+  defaultValue: NonNullable<RemoteConfig[K]>
+): NonNullable<RemoteConfig[K]> {
+  const configValue = remoteConfig[key]
+  return configValue || defaultValue
+}
+
 /**
  * Loads remote configuration from the backend /api/features endpoint
  * and updates the reactive remoteConfig ref
diff --git a/src/platform/remoteConfig/types.ts b/src/platform/remoteConfig/types.ts
index 939c6bbf1..43bfbd70f 100644
--- a/src/platform/remoteConfig/types.ts
+++ b/src/platform/remoteConfig/types.ts
@@ -8,6 +8,17 @@ type ServerHealthAlert = {
   badge?: string
 }
 
+type FirebaseRuntimeConfig = {
+  apiKey: string
+  authDomain: string
+  databaseURL?: string
+  projectId: string
+  storageBucket: string
+  messagingSenderId: string
+  appId: string
+  measurementId?: string
+}
+
 /**
  * Remote configuration type
  * Configuration fetched from the server at runtime
@@ -16,4 +27,8 @@ export type RemoteConfig = {
   mixpanel_token?: string
   subscription_required?: boolean
   server_health_alert?: ServerHealthAlert
+  max_upload_size?: number
+  comfy_api_base_url?: string
+  comfy_platform_base_url?: string
+  firebase_config?: FirebaseRuntimeConfig
 }
diff --git a/src/platform/updates/common/releaseService.ts b/src/platform/updates/common/releaseService.ts
index 189421678..6b9bfceed 100644
--- a/src/platform/updates/common/releaseService.ts
+++ b/src/platform/updates/common/releaseService.ts
@@ -1,18 +1,11 @@
 import type { AxiosError, AxiosResponse } from 'axios'
 import axios from 'axios'
-import { ref } from 'vue'
+import { ref, watch } from 'vue'
 
-import { COMFY_API_BASE_URL } from '@/config/comfyApi'
+import { getComfyApiBaseUrl } from '@/config/comfyApi'
 import type { components, operations } from '@/types/comfyRegistryTypes'
 import { isAbortError } from '@/utils/typeGuardUtil'
 
-const releaseApiClient = axios.create({
-  baseURL: COMFY_API_BASE_URL,
-  headers: {
-    'Content-Type': 'application/json'
-  }
-})
-
 // Use generated types from OpenAPI spec
 export type ReleaseNote = components['schemas']['ReleaseNote']
 type GetReleasesParams = operations['getReleaseNotes']['parameters']['query']
@@ -20,11 +13,25 @@ type GetReleasesParams = operations['getReleaseNotes']['parameters']['query']
 // Use generated error response type
 type ErrorResponse = components['schemas']['ErrorResponse']
 
+const releaseApiClient = axios.create({
+  baseURL: getComfyApiBaseUrl(),
+  headers: {
+    'Content-Type': 'application/json'
+  }
+})
+
 // Release service for fetching release notes
 export const useReleaseService = () => {
   const isLoading = ref(false)
   const error = ref<string | null>(null)
 
+  watch(
+    () => getComfyApiBaseUrl(),
+    (url) => {
+      releaseApiClient.defaults.baseURL = url
+    }
+  )
+
   // No transformation needed - API response matches the generated type
 
   // Handle API errors with context
diff --git a/src/services/customerEventsService.ts b/src/services/customerEventsService.ts
index 04d0f1d66..830b2fc2d 100644
--- a/src/services/customerEventsService.ts
+++ b/src/services/customerEventsService.ts
@@ -1,9 +1,9 @@
 import type { AxiosError, AxiosResponse } from 'axios'
 import axios from 'axios'
-import { ref } from 'vue'
+import { ref, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
 
-import { COMFY_API_BASE_URL } from '@/config/comfyApi'
+import { getComfyApiBaseUrl } from '@/config/comfyApi'
 import { useFirebaseAuthStore } from '@/stores/firebaseAuthStore'
 import type { components, operations } from '@/types/comfyRegistryTypes'
 import { isAbortError } from '@/utils/typeGuardUtil'
@@ -24,7 +24,7 @@ type CustomerEventsResponseQuery =
 export type AuditLog = components['schemas']['AuditLog']
 
 const customerApiClient = axios.create({
-  baseURL: COMFY_API_BASE_URL,
+  baseURL: getComfyApiBaseUrl(),
   headers: {
     'Content-Type': 'application/json'
   }
@@ -35,6 +35,13 @@ export const useCustomerEventsService = () => {
   const error = ref<string | null>(null)
   const { d } = useI18n()
 
+  watch(
+    () => getComfyApiBaseUrl(),
+    (url) => {
+      customerApiClient.defaults.baseURL = url
+    }
+  )
+
   const handleRequestError = (
     err: unknown,
     context: string,
diff --git a/src/stores/firebaseAuthStore.ts b/src/stores/firebaseAuthStore.ts
index 08e441925..1c73539a9 100644
--- a/src/stores/firebaseAuthStore.ts
+++ b/src/stores/firebaseAuthStore.ts
@@ -21,7 +21,7 @@ import { defineStore } from 'pinia'
 import { computed, ref } from 'vue'
 import { useFirebaseAuth } from 'vuefire'
 
-import { COMFY_API_BASE_URL } from '@/config/comfyApi'
+import { getComfyApiBaseUrl } from '@/config/comfyApi'
 import { t } from '@/i18n'
 import { isCloud } from '@/platform/distribution/types'
 import { useTelemetry } from '@/platform/telemetry'
@@ -65,6 +65,8 @@ export const useFirebaseAuthStore = defineStore('firebaseAuth', () => {
   // Token refresh trigger - increments when token is refreshed
   const tokenRefreshTrigger = ref(0)
 
+  const buildApiUrl = (path: string) => `${getComfyApiBaseUrl()}${path}`
+
   // Providers
   const googleProvider = new GoogleAuthProvider()
   googleProvider.addScope('email')
@@ -163,7 +165,7 @@ export const useFirebaseAuthStore = defineStore('firebaseAuth', () => {
         )
       }
 
-      const response = await fetch(`${COMFY_API_BASE_URL}/customers/balance`, {
+      const response = await fetch(buildApiUrl('/customers/balance'), {
         headers: {
           ...authHeader,
           'Content-Type': 'application/json'
@@ -199,7 +201,7 @@ export const useFirebaseAuthStore = defineStore('firebaseAuth', () => {
       throw new FirebaseAuthStoreError(t('toastMessages.userNotAuthenticated'))
     }
 
-    const createCustomerRes = await fetch(`${COMFY_API_BASE_URL}/customers`, {
+    const createCustomerRes = await fetch(buildApiUrl('/customers'), {
       method: 'POST',
       headers: {
         ...authHeader,
@@ -367,7 +369,7 @@ export const useFirebaseAuthStore = defineStore('firebaseAuth', () => {
       customerCreated.value = true
     }
 
-    const response = await fetch(`${COMFY_API_BASE_URL}/customers/credit`, {
+    const response = await fetch(buildApiUrl('/customers/credit'), {
       method: 'POST',
       headers: {
         ...authHeader,
@@ -401,7 +403,7 @@ export const useFirebaseAuthStore = defineStore('firebaseAuth', () => {
       throw new FirebaseAuthStoreError(t('toastMessages.userNotAuthenticated'))
     }
 
-    const response = await fetch(`${COMFY_API_BASE_URL}/customers/billing`, {
+    const response = await fetch(buildApiUrl('/customers/billing'), {
       method: 'POST',
       headers: {
         ...authHeader,
diff --git a/tests-ui/tests/platform/cloud/subscription/useSubscription.test.ts b/tests-ui/tests/platform/cloud/subscription/useSubscription.test.ts
index ec356cfc3..e113e626e 100644
--- a/tests-ui/tests/platform/cloud/subscription/useSubscription.test.ts
+++ b/tests-ui/tests/platform/cloud/subscription/useSubscription.test.ts
@@ -283,7 +283,7 @@ describe('useSubscription', () => {
       handleViewUsageHistory()
 
       expect(windowOpenSpy).toHaveBeenCalledWith(
-        'https://platform.comfy.org/profile/usage',
+        'https://stagingplatform.comfy.org/profile/usage',
         '_blank'
       )
 
diff --git a/vitest.setup.ts b/vitest.setup.ts
index e3427e7c6..137b50db6 100644
--- a/vitest.setup.ts
+++ b/vitest.setup.ts
@@ -6,8 +6,27 @@ declare global {
   interface Window {
     __CONFIG__: {
       mixpanel_token?: string
+      require_whitelist?: boolean
       subscription_required?: boolean
-      server_health_alert?: string
+      max_upload_size?: number
+      comfy_api_base_url?: string
+      comfy_platform_base_url?: string
+      firebase_config?: {
+        apiKey: string
+        authDomain: string
+        databaseURL?: string
+        projectId: string
+        storageBucket: string
+        messagingSenderId: string
+        appId: string
+        measurementId?: string
+      }
+      server_health_alert?: {
+        message: string
+        tooltip?: string
+        severity?: 'info' | 'warning' | 'error'
+        badge?: string
+      }
     }
   }
 }
@@ -24,7 +43,17 @@ globalThis.__DISTRIBUTION__ = 'localhost'
 // Define runtime config for tests
 window.__CONFIG__ = {
   subscription_required: true,
-  mixpanel_token: 'test-token'
+  mixpanel_token: 'test-token',
+  comfy_api_base_url: 'https://stagingapi.comfy.org',
+  comfy_platform_base_url: 'https://stagingplatform.comfy.org',
+  firebase_config: {
+    apiKey: 'test',
+    authDomain: 'test.firebaseapp.com',
+    projectId: 'test',
+    storageBucket: 'test.appspot.com',
+    messagingSenderId: '123',
+    appId: '123'
+  }
 }
 
 // Mock Worker for extendable-media-recorder