diff --git a/.env.example b/.env.example
index a997cf8..81ec839 100644
--- a/.env.example
+++ b/.env.example
@@ -1,3 +1,6 @@
+# Kit (ex-ConvertKit) - newsletter infolettre
+KIT_API_SECRET_V4=kit_xxx
+
 # Behold.so feed IDs (voir docs/BEHOLD-SETUP.md)
 # 1) Inscris-toi sur https://behold.so/dashboard
 # 2) Connecte les 2 comptes Insta (@aep.politique + @julesneny)
diff --git a/src/components/astro/Footer.astro b/src/components/astro/Footer.astro
new file mode 100644
index 0000000..e984908
--- /dev/null
+++ b/src/components/astro/Footer.astro
@@ -0,0 +1,70 @@
+---
+// Footer.astro - CTA infolettre Kit + nav footer
+---
+<footer class="border-t border-neutral-200 px-6 py-8 text-sm bg-white">
+  <div class="max-w-3xl mx-auto">
+    <h3 class="font-semibold mb-1" style="font-family: 'Courier New', Courier, monospace;">
+      S'abonner a la lettre
+    </h3>
+    <p class="text-neutral-600 text-xs mb-3">
+      1-2 emails par mois - pas de spam - desinscription en 1 clic.
+    </p>
+    <form id="subscribe-form" class="flex gap-2 max-w-md">
+      <input
+        type="email"
+        name="email"
+        required
+        placeholder="ton@email.fr"
+        class="flex-1 px-3 py-2 border border-neutral-300 rounded-lg text-sm focus:outline-none focus:border-neutral-900"
+      />
+      <button
+        type="submit"
+        class="px-4 py-2 bg-neutral-900 text-white rounded-lg text-sm hover:bg-neutral-700 transition-colors"
+      >
+        s'abonner
+      </button>
+    </form>
+    <p id="subscribe-msg" class="mt-2 text-xs text-neutral-500 min-h-[1rem]"></p>
+    <nav class="mt-6 flex flex-wrap gap-4 text-xs text-neutral-500">
+      <a href="/manifeste" class="hover:text-neutral-900">Manifeste</a>
+      <a href="/a-propos" class="hover:text-neutral-900">A propos</a>
+      <a href="/mentions-legales" class="hover:text-neutral-900">Mentions legales</a>
+      <a href="https://www.instagram.com/aep.politique/" target="_blank" rel="noopener" class="hover:text-neutral-900">@aep.politique</a>
+    </nav>
+  </div>
+</footer>
+
+<script>
+  const form = document.getElementById('subscribe-form') as HTMLFormElement | null;
+  const msg = document.getElementById('subscribe-msg') as HTMLParagraphElement | null;
+
+  form?.addEventListener('submit', async (e) => {
+    e.preventDefault();
+    if (!msg || !form) return;
+
+    const emailInput = form.elements.namedItem('email') as HTMLInputElement;
+    const email = emailInput?.value?.trim() ?? '';
+    if (!email) return;
+
+    msg.textContent = 'envoi...';
+
+    try {
+      const r = await fetch('/api/subscribe', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ email }),
+      });
+      const data = await r.json();
+      if (data.ok) {
+        msg.textContent = data.already
+          ? 'tu es deja abonne - a tres vite.'
+          : 'merci ! check ta boite mail (parfois spam).';
+        form.reset();
+      } else {
+        msg.textContent = `souci : ${data.error || 'reessaie plus tard'}`;
+      }
+    } catch {
+      msg.textContent = 'erreur reseau - reessaie plus tard';
+    }
+  });
+</script>
diff --git a/src/layouts/BaseLayout.astro b/src/layouts/BaseLayout.astro
index 913fb31..bde0144 100644
--- a/src/layouts/BaseLayout.astro
+++ b/src/layouts/BaseLayout.astro
@@ -1,5 +1,6 @@
 ---
 import '../styles/global.css';
+import Footer from '../components/astro/Footer.astro';
 
 interface Props {
   title?: string;
@@ -29,5 +30,6 @@ const {
   </head>
   <body class="m-0 bg-white text-neutral-900 antialiased">
     <slot />
+    <Footer />
   </body>
 </html>
diff --git a/src/pages/api/subscribe.ts b/src/pages/api/subscribe.ts
new file mode 100644
index 0000000..00df66a
--- /dev/null
+++ b/src/pages/api/subscribe.ts
@@ -0,0 +1,71 @@
+import type { APIRoute } from 'astro'
+
+export const prerender = false
+
+const KIT_API_BASE = 'https://api.kit.com/v4'
+
+export const POST: APIRoute = async ({ request }) => {
+  const KIT_API_KEY = import.meta.env.KIT_API_SECRET_V4
+  if (!KIT_API_KEY) {
+    return new Response(JSON.stringify({ error: 'config_missing' }), {
+      status: 500,
+      headers: { 'Content-Type': 'application/json' },
+    })
+  }
+
+  let body: { email: string; first_name?: string }
+  try {
+    body = await request.json()
+  } catch {
+    return new Response(JSON.stringify({ error: 'invalid_json' }), {
+      status: 400,
+      headers: { 'Content-Type': 'application/json' },
+    })
+  }
+
+  const email = (body.email || '').trim().toLowerCase()
+  if (!email || !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)) {
+    return new Response(JSON.stringify({ error: 'invalid_email' }), {
+      status: 400,
+      headers: { 'Content-Type': 'application/json' },
+    })
+  }
+
+  try {
+    const upstream = await fetch(`${KIT_API_BASE}/subscribers`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        'X-Kit-Api-Key': KIT_API_KEY,
+      },
+      body: JSON.stringify({
+        email_address: email,
+        first_name: body.first_name || undefined,
+        state: 'active',
+      }),
+      signal: AbortSignal.timeout(10000),
+    })
+
+    if (upstream.ok) {
+      return new Response(JSON.stringify({ ok: true }), {
+        status: 200,
+        headers: { 'Content-Type': 'application/json' },
+      })
+    }
+    if (upstream.status === 422) {
+      return new Response(JSON.stringify({ ok: true, already: true }), {
+        status: 200,
+        headers: { 'Content-Type': 'application/json' },
+      })
+    }
+    return new Response(
+      JSON.stringify({ error: 'kit_failed', status: upstream.status }),
+      { status: 502, headers: { 'Content-Type': 'application/json' } }
+    )
+  } catch (e) {
+    return new Response(
+      JSON.stringify({ error: 'upstream_failed', detail: (e as Error).message }),
+      { status: 502, headers: { 'Content-Type': 'application/json' } }
+    )
+  }
+}
