diff --git a/packages/wallet/wallet-toolbox/CHANGELOG.md b/packages/wallet/wallet-toolbox/CHANGELOG.md
index 95d40d9ce..ccf749db4 100644
--- a/packages/wallet/wallet-toolbox/CHANGELOG.md
+++ b/packages/wallet/wallet-toolbox/CHANGELOG.md
@@ -6,6 +6,11 @@ attention to changes that materially alter behavior or extend functionality.
 
 ## wallet-toolbox (unreleased)
 
+- Fix `WalletStorageManager.getStoreEndpointURL` / `getStores().endpointURL` to
+  duck-type provider `endpointUrl` instead of matching
+  `constructor.name === 'StorageClient'`. Production minifiers rename classes,
+  so the name check left remote stores with `endpointURL: undefined` while
+  sync still worked; clients that select a backup by URL (make primary) failed.
 - Point Wallet Toolbox contributors and AI agents to the canonical stack-level
   contribution and quality policy; keep client and mobile candidate versions
   in release lockstep without changing runtime behavior.
diff --git a/packages/wallet/wallet-toolbox/src/storage/WalletStorageManager.ts b/packages/wallet/wallet-toolbox/src/storage/WalletStorageManager.ts
index 008812c3e..f657f9252 100644
--- a/packages/wallet/wallet-toolbox/src/storage/WalletStorageManager.ts
+++ b/packages/wallet/wallet-toolbox/src/storage/WalletStorageManager.ts
@@ -25,7 +25,6 @@ import {
   TableUser
 } from '../storage/schema/tables'
 import { StorageProvider } from './StorageProvider'
-import { StorageClient } from './remoting/StorageClient'
 
 class ManagedStorage {
   isAvailable: boolean
@@ -955,8 +954,20 @@ export class WalletStorageManager implements sdk.WalletStorage {
     return log
   }
 
+  /**
+   * Return the remote HTTP(S) endpoint for a managed store, if any.
+   *
+   * Duck-types `endpointUrl` on the provider (as set by `StorageClientBase`).
+   * Do **not** key this off `constructor.name === 'StorageClient'`: production
+   * minifiers (Vite/esbuild/webpack) rename classes, so that check fails and
+   * every remote store reports `endpointURL: undefined` even though the URL is
+   * present. Consumers that match backups by URL (e.g. making a remote store
+   * primary) then fail while sync still works, because sync walks `_backups`
+   * without needing `endpointURL`.
+   */
   getStoreEndpointURL(store: ManagedStorage): string | undefined {
-    if (store.storage.constructor.name === 'StorageClient') return (store.storage as StorageClient).endpointUrl
+    const url = (store.storage as { endpointUrl?: unknown }).endpointUrl
+    if (typeof url === 'string' && url.length > 0) return url
     return undefined
   }
 
diff --git a/packages/wallet/wallet-toolbox/test/storage/getStoreEndpointURL.test.ts b/packages/wallet/wallet-toolbox/test/storage/getStoreEndpointURL.test.ts
new file mode 100644
index 000000000..3897c23e6
--- /dev/null
+++ b/packages/wallet/wallet-toolbox/test/storage/getStoreEndpointURL.test.ts
@@ -0,0 +1,83 @@
+/**
+ * getStoreEndpointURL / getStores().endpointURL must survive production
+ * minification. Class names are rewritten, so constructor.name is not stable.
+ */
+import { WalletStorageManager } from '../../src/storage/WalletStorageManager'
+
+function managedStore(storage: object, storageIdentityKey = 'store-key') {
+  return {
+    isAvailable: true,
+    isStorageProvider: false,
+    settings: {
+      storageIdentityKey,
+      storageName: 'test_store',
+      chain: 'test',
+      dbName: 'test',
+      storageSchemaVersion: 1,
+      maxOutputScript: 0
+    },
+    user: {
+      userId: 1,
+      identityKey: '02' + '11'.repeat(32),
+      activeStorage: storageIdentityKey
+    },
+    storage
+  } as any
+}
+
+describe('WalletStorageManager.getStoreEndpointURL', () => {
+  it('returns endpointUrl for a StorageClient-shaped provider', () => {
+    class StorageClient {
+      endpointUrl = 'https://store-us-1.bsvb.tech'
+    }
+    const manager = new WalletStorageManager('identity')
+    const store = managedStore(new StorageClient())
+    expect(manager.getStoreEndpointURL(store)).toBe('https://store-us-1.bsvb.tech')
+  })
+
+  it('returns endpointUrl when constructor.name is minified (not StorageClient)', () => {
+    // Vite/esbuild minify renames classes to single-letter identifiers.
+    class a {
+      endpointUrl = 'https://store-us-1.bsvb.tech/'
+    }
+    expect(new a().constructor.name).not.toBe('StorageClient')
+
+    const manager = new WalletStorageManager('identity')
+    const store = managedStore(new a())
+    expect(manager.getStoreEndpointURL(store)).toBe('https://store-us-1.bsvb.tech/')
+  })
+
+  it('returns undefined for local providers without endpointUrl', () => {
+    class StorageKnex {}
+    const manager = new WalletStorageManager('identity')
+    expect(manager.getStoreEndpointURL(managedStore(new StorageKnex()))).toBeUndefined()
+  })
+
+  it('returns undefined for empty endpointUrl strings', () => {
+    const manager = new WalletStorageManager('identity')
+    expect(manager.getStoreEndpointURL(managedStore({ endpointUrl: '' }))).toBeUndefined()
+  })
+
+  it('exposes endpointURL via getStores even when class name is mangled', () => {
+    class a {
+      endpointUrl = 'https://store-us-1.bsvb.tech'
+    }
+    class LocalStore {}
+
+    const manager = new WalletStorageManager('identity')
+    // Bypass makeAvailable: populate partitions the same way makeAvailable would.
+    ;(manager as any)._isAvailable = true
+    ;(manager as any)._active = managedStore(new LocalStore(), 'local-key')
+    ;(manager as any)._backups = [managedStore(new a(), 'remote-key')]
+    ;(manager as any)._conflictingActives = []
+
+    const stores = manager.getStores()
+    expect(stores).toHaveLength(2)
+
+    const local = stores.find(s => s.storageIdentityKey === 'local-key')
+    const remote = stores.find(s => s.storageIdentityKey === 'remote-key')
+    expect(local?.endpointURL).toBeUndefined()
+    expect(remote?.endpointURL).toBe('https://store-us-1.bsvb.tech')
+    expect(remote?.isBackup).toBe(true)
+  })
+})