diff --git a/packages/stage-ui/src/stores/providers.ts b/packages/stage-ui/src/stores/providers.ts
index d266a3d18..72873b061 100644
--- a/packages/stage-ui/src/stores/providers.ts
+++ b/packages/stage-ui/src/stores/providers.ts
@@ -48,7 +48,7 @@ import {
 import { computed, ref, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
 
-import { isAbsoluteUrl } from '../utils/string'
+import { isUrl } from '../utils/url'
 import { models as elevenLabsModels } from './providers/elevenlabs/list-models'
 
 export interface ProviderMetadata {
@@ -160,11 +160,29 @@ export interface VoiceInfo {
 export const useProvidersStore = defineStore('providers', () => {
   const providerCredentials = useLocalStorage<Record<string, Record<string, unknown>>>('settings/credentials/providers', {})
   const { t } = useI18n()
-  const notBaseUrlError = computed(() => ({
-    errors: [new Error('Base URL is not absolute')],
-    reason: 'Base URL is not absolute. Check your input.',
-    valid: false,
-  }))
+  const baseUrlValidator = computed(() => (baseUrl: unknown) => {
+    let msg = ''
+    if (!baseUrl) {
+      msg = 'Base URL is required.'
+    }
+    else if (typeof baseUrl !== 'string') {
+      msg = 'Base URL must be a string.'
+    }
+    else if (!isUrl(baseUrl) || new URL(baseUrl).host.length === 0) {
+      msg = 'Base URL is not absolute. Try to include a scheme (http:// or https://).'
+    }
+    else if (!baseUrl.endsWith('/')) {
+      msg = 'Base URL must end with a trailing slash (/).'
+    }
+    if (msg) {
+      return {
+        errors: [new Error(msg)],
+        reason: msg,
+        valid: false,
+      }
+    }
+    return null
+  })
 
   // Helper function to fetch OpenRouter models manually
   async function fetchOpenRouterModels(config: Record<string, unknown>): Promise<ModelInfo[]> {
@@ -223,8 +241,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -504,8 +523,9 @@ export const useProvidersStore = defineStore('providers', () => {
             }
           }
 
-          if (!isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           // Check if the Ollama server is reachable
@@ -570,8 +590,9 @@ export const useProvidersStore = defineStore('providers', () => {
             }
           }
 
-          if (!isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           // Check if the Ollama server is reachable
@@ -665,8 +686,9 @@ export const useProvidersStore = defineStore('providers', () => {
             }
           }
 
-          if (!isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           // Check if the vLLM is reachable
@@ -742,6 +764,11 @@ export const useProvidersStore = defineStore('providers', () => {
             }
           }
 
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
+          }
+
           // Check if the LM Studio server is reachable
           return fetch(`${(config.baseUrl as string).trim()}models`, { headers: (config.headers as HeadersInit) || undefined })
             .then((response) => {
@@ -800,8 +827,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required. Default to https://api.openai.com/v1/ for official OpenAI API.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -848,8 +876,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -965,8 +994,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required. Default to https://api.openai.com/v1/ for official OpenAI API.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -1016,8 +1046,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -1063,8 +1094,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required. Default to https://api.openai.com/v1/ for official OpenAI API.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -1111,8 +1143,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -1246,8 +1279,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required. Default to https://api.anthropic.com/v1/ for official Claude API with OpenAI compatibility.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -1294,8 +1328,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required. Default to https://generativelanguage.googleapis.com/v1beta/openai/ for official Google Gemini API with OpenAI compatibility.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -1383,8 +1418,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -1467,8 +1503,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -1531,8 +1568,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -1592,8 +1630,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required. Default to http://localhost:11996/tts for Index-TTS.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -1664,8 +1703,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -1729,8 +1769,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !((config.app as any)?.appId) && new Error('App ID is required.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -1900,8 +1941,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -2003,8 +2045,9 @@ export const useProvidersStore = defineStore('providers', () => {
             !config.baseUrl && new Error('Base URL is required.'),
           ].filter(Boolean)
 
-          if (!!config.baseUrl && !isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
@@ -2131,12 +2174,13 @@ export const useProvidersStore = defineStore('providers', () => {
             }
           }
 
-          if (!isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           // Check if the local running Player 2 is reachable
-          return await fetch(`${(config.baseUrl as string).endsWith('/') ? (config.baseUrl as string).slice(0, -1) : config.baseUrl}/health`, {
+          return await fetch(`${config.baseUrl}health`, {
             method: 'GET',
             headers: {
               'player2-game-key': 'airi',
@@ -2241,8 +2285,9 @@ export const useProvidersStore = defineStore('providers', () => {
             }
           }
 
-          if (!isAbsoluteUrl(config.baseUrl as string)) {
-            return notBaseUrlError.value
+          const res = baseUrlValidator.value(config.baseUrl)
+          if (res) {
+            return res
           }
 
           return {
diff --git a/packages/stage-ui/src/utils/string.ts b/packages/stage-ui/src/utils/string.ts
deleted file mode 100644
index 20bebbe91..000000000
--- a/packages/stage-ui/src/utils/string.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-export function isAbsoluteUrl(url: string) {
-  try {
-    // This could be the most reliable way to check so using side-effect is acceptable
-    // eslint-disable-next-line no-new
-    new URL(url)
-    return true
-  }
-  catch {
-    return false
-  }
-}
diff --git a/packages/stage-ui/src/utils/url.ts b/packages/stage-ui/src/utils/url.ts
new file mode 100644
index 000000000..e7e033f76
--- /dev/null
+++ b/packages/stage-ui/src/utils/url.ts
@@ -0,0 +1,10 @@
+export function isUrl(url: string) {
+  try {
+    // eslint-disable-next-line no-new
+    new URL(url)
+    return true
+  }
+  catch {
+    return false
+  }
+}