diff --git a/libs/fluxc/src/main/java/org/wordpress/android/fluxc/model/SiteModel.java b/libs/fluxc/src/main/java/org/wordpress/android/fluxc/model/SiteModel.java
index 0635d78e55a2..4debf1e53a31 100644
--- a/libs/fluxc/src/main/java/org/wordpress/android/fluxc/model/SiteModel.java
+++ b/libs/fluxc/src/main/java/org/wordpress/android/fluxc/model/SiteModel.java
@@ -438,6 +438,14 @@ public void setXmlRpcUrl(String xmlRpcUrl) {
     }
 
     public String getWpApiRestUrl() {
+        // WP.com simple sites don't have a stored wpApiRestUrl (the WP.com REST API
+        // response never sets it, and no other code path populates it for these sites).
+        // Return the public-api proxy URL so all callers get the correct endpoint
+        // without needing site-type checks at every call site.
+        if (isWPComSimpleSite()) {
+            return "https://public-api.wordpress.com/wp/v2/sites/"
+                    + mSiteId;
+        }
         return mWpApiRestUrl;
     }
 
@@ -926,6 +934,10 @@ public boolean hasDiskSpaceQuotaInformation() {
         return mSpaceAllowed > 0;
     }
 
+    public boolean isWPComSimpleSite() {
+        return isWPCom() && !isWPComAtomic();
+    }
+
     public boolean isWPComAtomic() {
         return mIsWPComAtomic;
     }
diff --git a/libs/fluxc/src/main/java/org/wordpress/android/fluxc/network/rest/wpapi/rs/WpApiClientProvider.kt b/libs/fluxc/src/main/java/org/wordpress/android/fluxc/network/rest/wpapi/rs/WpApiClientProvider.kt
index 3293117cc6f9..cf3f67009245 100644
--- a/libs/fluxc/src/main/java/org/wordpress/android/fluxc/network/rest/wpapi/rs/WpApiClientProvider.kt
+++ b/libs/fluxc/src/main/java/org/wordpress/android/fluxc/network/rest/wpapi/rs/WpApiClientProvider.kt
@@ -16,9 +16,11 @@ import uniffi.wp_api.CookiesNonceAuthenticationProvider
 import uniffi.wp_api.WpAppNotifier
 import uniffi.wp_api.WpAuthentication
 import uniffi.wp_api.WpAuthenticationProvider
+import uniffi.wp_api.ParsedUrl
 import uniffi.wp_api.WpComBaseUrl
 import uniffi.wp_api.WpComDotOrgApiUrlResolver as WpComUrlResolver // checkstyle ignore
 import uniffi.wp_api.WpDynamicAuthenticationProvider
+import uniffi.wp_api.WpOrgSiteApiUrlResolver
 import java.net.URL
 import javax.inject.Inject
 import javax.inject.Named
@@ -56,7 +58,8 @@ class WpApiClientProvider @Inject constructor(
         site: SiteModel,
         uploadListener: WpRequestExecutor.UploadListener? = null
     ): WpApiClient = when {
-        site.isWPCom -> getWpComApiClient(site)
+        site.isWPCom || site.isUsingWpComRestApi ->
+            getWpComApiClient(site)
         // Skip caching when an upload listener is provided —
         // upload flows need a dedicated client with progress
         // callbacks.
@@ -76,8 +79,12 @@ class WpApiClientProvider @Inject constructor(
                 username = site.apiRestUsernamePlain,
                 password = site.apiRestPasswordPlain,
             )
+
+        val urlResolver =
+            WpOrgSiteApiUrlResolver(ParsedUrl.parse(site.buildUrl()))
+
         return WpApiClient(
-            wpOrgSiteApiRootUrl = URL(site.buildUrl()),
+            apiUrlResolver = urlResolver,
             authProvider = authProvider,
             requestExecutor = WpRequestExecutor(
                 interceptors = interceptors.toList(),
diff --git a/libs/fluxc/src/test/java/org/wordpress/android/fluxc/model/site/SiteModelTest.kt b/libs/fluxc/src/test/java/org/wordpress/android/fluxc/model/site/SiteModelTest.kt
index f530565f411c..ef1cba2c4e81 100644
--- a/libs/fluxc/src/test/java/org/wordpress/android/fluxc/model/site/SiteModelTest.kt
+++ b/libs/fluxc/src/test/java/org/wordpress/android/fluxc/model/site/SiteModelTest.kt
@@ -3,7 +3,9 @@ package org.wordpress.android.fluxc.model.site
 import org.junit.Test
 import org.wordpress.android.fluxc.model.SiteModel
 import org.wordpress.android.fluxc.site.SiteUtils
+import kotlin.test.assertEquals
 import kotlin.test.assertFalse
+import kotlin.test.assertNull
 import kotlin.test.assertTrue
 
 class SiteModelTest {
@@ -157,6 +159,100 @@ class SiteModelTest {
         assertFalse(site.supportsSharing())
     }
 
+    /* isWPComSimpleSite */
+    @Test
+    fun `wpcom non-atomic site is a simple site`() {
+        val site = SiteUtils.generateWPComSite()
+        site.setIsWPComAtomic(false)
+
+        assertTrue(site.isWPComSimpleSite)
+    }
+
+    @Test
+    fun `wpcom atomic site is not a simple site`() {
+        val site = SiteUtils.generateWPComSite()
+        site.setIsWPComAtomic(true)
+
+        assertFalse(site.isWPComSimpleSite)
+    }
+
+    @Test
+    fun `self-hosted site is not a simple site`() {
+        val site = SiteUtils.generateSelfHostedNonJPSite()
+
+        assertFalse(site.isWPComSimpleSite)
+    }
+
+    @Test
+    fun `jetpack site is not a simple site`() {
+        val site = SiteUtils.generateJetpackSiteOverRestOnly()
+
+        assertFalse(site.isWPComSimpleSite)
+    }
+
+    /* getWpApiRestUrl — proxy URL for simple sites */
+    @Test
+    fun `atomic site returns stored wpApiRestUrl`() {
+        val site = SiteUtils.generateWPComSite()
+        site.setIsWPComAtomic(true)
+        site.wpApiRestUrl = "https://atomic.example.com/wp-json/"
+
+        assertEquals("https://atomic.example.com/wp-json/", site.wpApiRestUrl)
+    }
+
+    @Test
+    fun `self-hosted site with no wpApiRestUrl returns null`() {
+        val site = SiteUtils.generateSelfHostedNonJPSite()
+
+        assertNull(site.wpApiRestUrl)
+    }
+
+    @Test
+    fun `atomic site with no stored wpApiRestUrl returns null`() {
+        val site = SiteUtils.generateWPComSite()
+        site.setIsWPComAtomic(true)
+
+        assertNull(site.wpApiRestUrl)
+    }
+
+    @Test
+    fun `simple site proxy URL uses wpcom siteId not local id`() {
+        val site = SiteUtils.generateWPComSite()
+        site.setIsWPComAtomic(false)
+        site.siteId = 99887766
+        site.id = 42
+
+        assertEquals(
+            "https://public-api.wordpress.com/wp/v2/sites/99887766",
+            site.wpApiRestUrl
+        )
+    }
+
+    @Test
+    fun `simple site proxy URL overrides stored wpApiRestUrl`() {
+        val site = SiteUtils.generateWPComSite()
+        site.setIsWPComAtomic(false)
+        site.wpApiRestUrl = "https://should-be-ignored.example.com/wp-json/"
+
+        assertEquals(
+            "https://public-api.wordpress.com/wp/v2/sites/${site.siteId}",
+            site.wpApiRestUrl
+        )
+    }
+
+    @Test
+    fun `jetpack REST site returns stored url not proxy`() {
+        val site = SiteUtils.generateJetpackSiteOverRestOnly()
+        site.wpApiRestUrl = "https://jetpack.example.com/wp-json/"
+
+        assertTrue(site.isUsingWpComRestApi)
+        assertFalse(site.isWPComSimpleSite)
+        assertEquals(
+            "https://jetpack.example.com/wp-json/",
+            site.wpApiRestUrl
+        )
+    }
+
     private fun SiteModel.setPublicizeSupport(enablePublicizeSupport: Boolean) {
         this.hasCapabilityPublishPosts = enablePublicizeSupport
         if (isJetpackConnected) {