diff --git a/index.html b/index.html
index 21a65c5..28de876 100644
--- a/index.html
+++ b/index.html
@@ -10,11 +10,6 @@
     <link rel="manifest" href="/manifest.webmanifest" />
     <meta name="theme-color" content="#09070B" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <script
-      async
-      src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-7071904662816669"
-      crossorigin="anonymous"
-    ></script>
     <link rel="alternate" type="application/rss+xml" title="OpenThorn Blog" href="https://www.openthorn.app/rss.xml" />
     <meta name="description" content="OpenThorn is the BYOK AI website builder — describe what you want, get a complete, deployable website. No subscription, no lock-in." />
     <title>OpenThorn — The BYOK AI Website Builder</title>
diff --git a/public/ads.txt b/public/ads.txt
index 07e259e..41f79f1 100644
--- a/public/ads.txt
+++ b/public/ads.txt
@@ -1 +1,4 @@
-google.com, pub-7071904662816669, DIRECT, f08c47fec0942fa0
+# Authorized digital sellers for openthorn.app inventory.
+# Replace the Adsterra line below with the exact record shown in the Adsterra
+# dashboard if it includes a certification (4th) field.
+adsterra.com, 31110698, DIRECT
diff --git a/src/App.tsx b/src/App.tsx
index 9d52914..3fb5842 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -10,6 +10,7 @@ import Header from './components/Header/Header'
 import HeroSection from './components/HeroSection/HeroSection'
 import MeetOpenThornSection from './components/MeetOpenThornSection/MeetOpenThornSection'
 import BYOKSection from './components/BYOKSection/BYOKSection'
+import AdsterraNativeBanner from './components/AdsterraNativeBanner/AdsterraNativeBanner'
 import BottomCTA from './components/BottomCTA/BottomCTA'
 import Footer from './components/Footer/Footer'
 import AuthModal from './components/AuthModal/AuthModal'
@@ -75,6 +76,7 @@ function HomePage() {
       <HeroSection />
       <MeetOpenThornSection />
       <BYOKSection />
+      <AdsterraNativeBanner />
       <BottomCTA />
     </>
   )
diff --git a/src/components/AdsterraNativeBanner/AdsterraNativeBanner.module.css b/src/components/AdsterraNativeBanner/AdsterraNativeBanner.module.css
new file mode 100644
index 0000000..1794c07
--- /dev/null
+++ b/src/components/AdsterraNativeBanner/AdsterraNativeBanner.module.css
@@ -0,0 +1,39 @@
+.wrapper {
+  max-width: var(--max-width);
+  margin: 0 auto;
+  padding: var(--space-2xl) var(--space-lg);
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: var(--space-sm);
+  text-align: center;
+}
+
+.label {
+  font-family: var(--font-body);
+  font-size: 11px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.14em;
+  color: var(--color-text-muted);
+}
+
+.container {
+  width: 100%;
+  min-height: 90px;
+  display: flex;
+  justify-content: center;
+  overflow: hidden;
+  border-radius: var(--radius-lg);
+}
+
+/* Nothing rendered (blocked tag, empty response) — collapse the slot. */
+.wrapper:has(.container:empty) {
+  display: none;
+}
+
+@media (max-width: 640px) {
+  .wrapper {
+    padding: var(--space-xl) var(--space-md);
+  }
+}
diff --git a/src/components/AdsterraNativeBanner/AdsterraNativeBanner.tsx b/src/components/AdsterraNativeBanner/AdsterraNativeBanner.tsx
new file mode 100644
index 0000000..cf4b5a8
--- /dev/null
+++ b/src/components/AdsterraNativeBanner/AdsterraNativeBanner.tsx
@@ -0,0 +1,52 @@
+import { useEffect, useRef, useState } from 'react'
+import styles from './AdsterraNativeBanner.module.css'
+
+/** Adsterra native-banner tag (zone acd496412d230553ca4f4a243557f98c). */
+const SCRIPT_SRC =
+  'https://pl31110698.profitableratecpmnetwork.com/acd496412d230553ca4f4a243557f98c/invoke.js'
+const CONTAINER_ID = 'container-acd496412d230553ca4f4a243557f98c'
+
+/**
+ * Only one Adsterra tag may be active at a time. Tracked module-wide so a
+ * remount always replaces the previous tag instead of stacking duplicates.
+ */
+let activeScript: HTMLScriptElement | null = null
+
+export default function AdsterraNativeBanner() {
+  const containerRef = useRef<HTMLDivElement>(null)
+  const [failed, setFailed] = useState(false)
+
+  useEffect(() => {
+    const container = containerRef.current
+    if (!container) return
+
+    // Adsterra's invoke.js fills whichever element matches CONTAINER_ID when it
+    // executes, so re-append the tag on mount to refill a freshly mounted
+    // container (route re-entry, Strict Mode double-invoke).
+    activeScript?.remove()
+
+    const script = document.createElement('script')
+    script.async = true
+    script.setAttribute('data-cfasync', 'false')
+    script.src = SCRIPT_SRC
+    script.onerror = () => setFailed(true)
+    document.head.appendChild(script)
+    activeScript = script
+
+    return () => {
+      script.remove()
+      if (activeScript === script) activeScript = null
+      container.innerHTML = ''
+    }
+  }, [])
+
+  // Blocked or unreachable tags (ad blockers, offline) leave no empty gap.
+  if (failed) return null
+
+  return (
+    <aside className={styles.wrapper} aria-label="Advertisement">
+      <span className={styles.label}>Advertisement</span>
+      <div id={CONTAINER_ID} className={styles.container} ref={containerRef} />
+    </aside>
+  )
+}
diff --git a/vercel.json b/vercel.json
index 77aa222..8e05996 100644
--- a/vercel.json
+++ b/vercel.json
@@ -24,7 +24,7 @@
         { "key": "Strict-Transport-Security", "value": "max-age=31536000; includeSubDomains" },
         {
           "key": "Content-Security-Policy",
-          "value": "default-src 'self'; base-uri 'self'; object-src 'none'; frame-ancestors 'none'; form-action 'self'; script-src 'self' 'unsafe-inline' 'wasm-unsafe-eval' blob: data: https://esm.sh https://pagead2.googlesyndication.com https://*.googlesyndication.com; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: https:; font-src 'self' data:; worker-src 'self' blob:; child-src 'self' blob:; frame-src 'self' blob: data: https://www.youtube-nocookie.com https://googleads.g.doubleclick.net https://*.googlesyndication.com; connect-src 'self' https: wss: blob: data:; manifest-src 'self'"
+          "value": "default-src 'self'; base-uri 'self'; object-src 'none'; frame-ancestors 'none'; form-action 'self'; script-src 'self' 'unsafe-inline' 'wasm-unsafe-eval' blob: data: https://esm.sh https://pl31110698.profitableratecpmnetwork.com https://*.profitableratecpmnetwork.com; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: https:; font-src 'self' data:; worker-src 'self' blob:; child-src 'self' blob:; frame-src 'self' blob: data: https://www.youtube-nocookie.com https://*.profitableratecpmnetwork.com; connect-src 'self' https: wss: blob: data:; manifest-src 'self'"
         }
       ]
     }