diff --git a/k8s/secrets.example.yml b/k8s/secrets.example.yml
index 9d6fcfb..6929825 100644
--- a/k8s/secrets.example.yml
+++ b/k8s/secrets.example.yml
@@ -14,7 +14,11 @@
 #   DATABASE_URL="postgres://anydrop:${POSTGRES_PASSWORD}@postgres.anydrop.svc.cluster.local:5432/anydrop"
 #   kubectl -n anydrop create secret generic anydrop-app-secrets \
 #     --from-literal=SESSION_SECRET="$SESSION_SECRET" \
-#     --from-literal=DATABASE_URL="$DATABASE_URL"
+#     --from-literal=DATABASE_URL="$DATABASE_URL" \
+#     --from-literal=STRIPE_SECRET_KEY="sk_live_…" \
+#     --from-literal=STRIPE_WEBHOOK_SECRET="whsec_…" \
+#     --from-literal=STRIPE_PRICE_MONTHLY="price_…" \
+#     --from-literal=STRIPE_PRICE_YEARLY="price_…"
 #
 #   # MinIO — reuses the shared cluster MinIO in the `minio` namespace.
 #   # Create a scoped user + policy on MinIO (one-shot), then store its
@@ -53,6 +57,13 @@ type: Opaque
 stringData:
   SESSION_SECRET: CHANGE_ME_64_BYTE_RANDOM_STRING
   DATABASE_URL: postgres://anydrop:CHANGE_ME@postgres.anydrop.svc.cluster.local:5432/anydrop
+  # Phase 3 — Stripe billing. Create the product + recurring prices in the
+  # Stripe dashboard, then fill these in. Leaving them unset disables the
+  # /api/billing/* and webhook routes gracefully (503).
+  STRIPE_SECRET_KEY: CHANGE_ME_sk_live_xxx
+  STRIPE_WEBHOOK_SECRET: CHANGE_ME_whsec_xxx
+  STRIPE_PRICE_MONTHLY: CHANGE_ME_price_xxx
+  STRIPE_PRICE_YEARLY: CHANGE_ME_price_xxx
 
 ---
 apiVersion: v1
diff --git a/web/src/App.tsx b/web/src/App.tsx
index a9b4254..e54dbe4 100644
--- a/web/src/App.tsx
+++ b/web/src/App.tsx
@@ -3,6 +3,7 @@ import Home from "./pages/Home";
 import JoinRoom from "./pages/JoinRoom";
 import Share from "./pages/Share";
 import Settings from "./pages/Settings";
+import Pricing from "./pages/Pricing";
 import Receive from "./pages/Receive";
 import Inbox from "./pages/Inbox";
 
@@ -12,6 +13,7 @@ export default function App() {
       <Route path="/" element={<Home />} />
       <Route path="/share" element={<Share />} />
       <Route path="/settings" element={<Settings />} />
+      <Route path="/pricing" element={<Pricing />} />
       <Route path="/inbox" element={<Inbox />} />
       <Route path="/r/:id" element={<Receive />} />
       <Route path="/:code" element={<JoinRoom />} />
diff --git a/web/src/lib/api.ts b/web/src/lib/api.ts
index f4eb4f4..85f4341 100644
--- a/web/src/lib/api.ts
+++ b/web/src/lib/api.ts
@@ -1,7 +1,10 @@
 export interface ApiUser {
   id: string;
   email: string;
-  plan: string;
+  plan: "free" | "pro";
+  planStatus: string | null;
+  planExpiresAt: string | null;
+  hasStripeCustomer: boolean;
   createdAt: string;
 }
 
@@ -162,3 +165,26 @@ export async function claimTransfer(id: string): Promise<boolean> {
   const body = (await res.json()) as { claimed: boolean };
   return body.claimed;
 }
+
+export async function startCheckout(interval: "monthly" | "yearly"): Promise<string> {
+  const res = await call("/api/billing/checkout", {
+    method: "POST",
+    body: JSON.stringify({ interval }),
+  });
+  if (!res.ok) {
+    const body = await res.json().catch(() => ({}));
+    throw new Error((body as { error?: string }).error ?? `checkout failed: ${res.status}`);
+  }
+  const { url } = (await res.json()) as { url: string };
+  return url;
+}
+
+export async function openBillingPortal(): Promise<string> {
+  const res = await call("/api/billing/portal", { method: "POST" });
+  if (!res.ok) {
+    const body = await res.json().catch(() => ({}));
+    throw new Error((body as { error?: string }).error ?? `portal failed: ${res.status}`);
+  }
+  const { url } = (await res.json()) as { url: string };
+  return url;
+}
diff --git a/web/src/pages/Home.tsx b/web/src/pages/Home.tsx
index eeeceb3..ff8e741 100644
--- a/web/src/pages/Home.tsx
+++ b/web/src/pages/Home.tsx
@@ -147,9 +147,14 @@ function HomeConnected() {
 
         <footer className="pt-6 mt-10 sm:pt-8 sm:mt-14 rule flex items-center justify-between text-xs text-ink-muted">
           <span>Nothing transits the server</span>
-          <Link to="/settings" className="text-ink hover:text-signal transition-colors duration-fast">
-            Account →
-          </Link>
+          <div className="flex items-center gap-4">
+            <Link to="/pricing" className="text-ink-muted hover:text-ink transition-colors duration-fast">
+              Pricing →
+            </Link>
+            <Link to="/settings" className="text-ink hover:text-signal transition-colors duration-fast">
+              Account →
+            </Link>
+          </div>
         </footer>
       </div>
 
diff --git a/web/src/pages/Pricing.tsx b/web/src/pages/Pricing.tsx
new file mode 100644
index 0000000..b54ebcd
--- /dev/null
+++ b/web/src/pages/Pricing.tsx
@@ -0,0 +1,206 @@
+import { useState } from "react";
+import { Link, useNavigate, useSearchParams } from "react-router-dom";
+import { useAuthStore } from "../stores/useAuthStore";
+import { startCheckout } from "../lib/api";
+
+const FREE_FEATURES = [
+  "Peer-to-peer transfers, LAN or link",
+  "Cloud relay up to 2 GB",
+  "Links expire within 7 days",
+  "1 download per link",
+  "Password protection",
+];
+
+const PRO_FEATURES = [
+  "Everything in Free",
+  "Cloud relay up to 20 GB",
+  "Links last up to 90 days",
+  "Up to 100 downloads per link",
+  "Priority support",
+];
+
+export default function Pricing() {
+  const user = useAuthStore((s) => s.user);
+  const navigate = useNavigate();
+  const [params] = useSearchParams();
+  const canceled = params.get("checkout") === "canceled";
+
+  const [interval, setInterval] = useState<"monthly" | "yearly">("monthly");
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  const handleUpgrade = async () => {
+    if (!user) {
+      navigate("/settings");
+      return;
+    }
+    setError(null);
+    setLoading(true);
+    try {
+      const url = await startCheckout(interval);
+      window.location.assign(url);
+    } catch (err) {
+      setLoading(false);
+      setError(err instanceof Error ? err.message : "unknown_error");
+    }
+  };
+
+  const isPro = user?.plan === "pro";
+
+  return (
+    <div className="min-h-screen">
+      <div className="max-w-2xl mx-auto px-5 sm:px-8 pt-10 pb-24">
+        <header className="flex items-center justify-between pb-8 mb-10 rule">
+          <Link
+            to="/"
+            className="text-sm text-ink-muted hover:text-ink transition-colors duration-fast"
+          >
+            ← Back
+          </Link>
+          <h1 className="font-display text-xl text-ink tracking-tight">Pricing</h1>
+          <div className="w-10" />
+        </header>
+
+        {canceled && (
+          <div className="mb-8 px-4 py-3 border border-paper-edge bg-paper-deep rounded-sm text-sm text-ink-muted">
+            Checkout canceled. No charge was made.
+          </div>
+        )}
+
+        <div className="mb-10">
+          <div className="text-xs uppercase tracking-[0.22em] text-ink-muted">
+            Plans
+          </div>
+          <h2 className="font-display text-3xl text-ink mt-2 tracking-tight">
+            Simple pricing, fair defaults
+          </h2>
+          <p className="text-sm text-ink-muted mt-3 leading-relaxed max-w-md">
+            Free forever for peer-to-peer and small cloud transfers. Pro unlocks
+            larger files, longer expiry, and multiple downloads.
+          </p>
+        </div>
+
+        <div className="inline-flex border border-paper-edge rounded-sm overflow-hidden mb-8">
+          <button
+            onClick={() => setInterval("monthly")}
+            className={`px-4 py-2 text-xs uppercase tracking-[0.15em] transition-colors
+              ${interval === "monthly" ? "bg-ink text-paper" : "bg-paper text-ink-muted hover:text-ink"}`}
+          >
+            Monthly
+          </button>
+          <button
+            onClick={() => setInterval("yearly")}
+            className={`px-4 py-2 text-xs uppercase tracking-[0.15em] transition-colors
+              ${interval === "yearly" ? "bg-ink text-paper" : "bg-paper text-ink-muted hover:text-ink"}`}
+          >
+            Yearly <span className="text-signal ml-1">−30%</span>
+          </button>
+        </div>
+
+        <div className="grid sm:grid-cols-2 gap-5">
+          <PlanCard
+            name="Free"
+            priceLabel="€0"
+            tagline="For every device, always"
+            features={FREE_FEATURES}
+            action={
+              <div className="text-xs text-ink-muted font-mono uppercase tracking-widest py-3">
+                Current plan if not upgraded
+              </div>
+            }
+          />
+          <PlanCard
+            highlighted
+            name="Pro"
+            priceLabel={interval === "monthly" ? "€6" : "€50"}
+            priceSuffix={interval === "monthly" ? "/ month" : "/ year"}
+            tagline="When 2 GB isn't enough"
+            features={PRO_FEATURES}
+            action={
+              isPro ? (
+                <Link
+                  to="/settings"
+                  className="block w-full text-center py-3 border border-paper-edge bg-paper
+                             hover:border-ink text-sm text-ink rounded-sm
+                             transition-colors duration-fast ease-crisp"
+                >
+                  Manage subscription →
+                </Link>
+              ) : (
+                <button
+                  onClick={handleUpgrade}
+                  disabled={loading}
+                  className="w-full py-3 bg-ink text-paper text-sm font-medium rounded-sm
+                             hover:bg-signal transition-colors duration-fast ease-crisp
+                             disabled:opacity-40"
+                >
+                  {loading ? "Opening checkout…" : user ? "Upgrade to Pro →" : "Sign in to upgrade →"}
+                </button>
+              )
+            }
+          />
+        </div>
+
+        {error && (
+          <p className="mt-5 text-xs text-fail font-mono">
+            {error === "billing_not_configured"
+              ? "Billing is not configured on this instance yet."
+              : error}
+          </p>
+        )}
+
+        <p className="mt-10 text-xs text-ink-faint leading-relaxed">
+          Payments are handled by Stripe. Cancel anytime from the customer portal.
+          Your peer-to-peer transfers never transit our servers — your plan affects
+          the optional cloud relay only.
+        </p>
+      </div>
+    </div>
+  );
+}
+
+function PlanCard({
+  name,
+  priceLabel,
+  priceSuffix,
+  tagline,
+  features,
+  action,
+  highlighted,
+}: {
+  name: string;
+  priceLabel: string;
+  priceSuffix?: string;
+  tagline: string;
+  features: string[];
+  action: React.ReactNode;
+  highlighted?: boolean;
+}) {
+  return (
+    <div
+      className={`paper-panel p-5 sm:p-6 flex flex-col ${
+        highlighted ? "shadow-lift border-ink" : ""
+      }`}
+    >
+      <div className="text-xs uppercase tracking-[0.22em] text-ink-muted">{name}</div>
+      <div className="flex items-baseline gap-2 mt-3">
+        <span className="font-display text-4xl text-ink tracking-tight">{priceLabel}</span>
+        {priceSuffix && (
+          <span className="text-xs text-ink-muted font-mono">{priceSuffix}</span>
+        )}
+      </div>
+      <p className="mt-2 text-sm text-ink-muted">{tagline}</p>
+
+      <ul className="mt-6 space-y-2.5 flex-1">
+        {features.map((f) => (
+          <li key={f} className="text-sm text-ink flex items-start gap-2">
+            <span className="text-signal mt-1">·</span>
+            <span>{f}</span>
+          </li>
+        ))}
+      </ul>
+
+      <div className="mt-6">{action}</div>
+    </div>
+  );
+}
diff --git a/web/src/pages/Settings.tsx b/web/src/pages/Settings.tsx
index 0126e34..7c0d98e 100644
--- a/web/src/pages/Settings.tsx
+++ b/web/src/pages/Settings.tsx
@@ -5,8 +5,10 @@ import { useProfileStore } from "../stores/useProfileStore";
 import {
   deleteTransfer,
   listInboxTransfers,
+  openBillingPortal,
   registerDevice,
   requestMagicLink,
+  startCheckout,
   unlinkDevice,
   type InboxTransfer,
 } from "../lib/api";
@@ -80,15 +82,11 @@ export default function Settings() {
         <div className="paper-panel px-5 py-4">
           <div className="text-xs uppercase tracking-[0.15em] text-ink-muted">Email</div>
           <div className="text-ink mt-1">{user.email}</div>
-          <div className="mt-4 pt-4 border-t border-paper-edge flex items-baseline justify-between">
-            <div className="text-xs uppercase tracking-[0.15em] text-ink-muted">Plan</div>
-            <div className="font-mono text-xs text-ink uppercase tracking-widest">
-              {user.plan}
-            </div>
-          </div>
         </div>
       </section>
 
+      <PlanSection />
+
       <ReceivedSection />
 
       <SharedLinksSection />
@@ -229,6 +227,115 @@ function SignInForm({ initialError }: { initialError: string | null }) {
   );
 }
 
+function PlanSection() {
+  const user = useAuthStore((s) => s.user);
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  if (!user) return null;
+
+  const isPro = user.plan === "pro";
+  const renewLabel = user.planExpiresAt
+    ? new Date(user.planExpiresAt).toLocaleDateString()
+    : null;
+  const statusLabel = user.planStatus === "canceled"
+    ? "ends"
+    : "renews";
+
+  const handleUpgrade = async () => {
+    setBusy(true);
+    setError(null);
+    try {
+      const url = await startCheckout("monthly");
+      window.location.assign(url);
+    } catch (err) {
+      setBusy(false);
+      setError(err instanceof Error ? err.message : "unknown");
+    }
+  };
+
+  const handlePortal = async () => {
+    setBusy(true);
+    setError(null);
+    try {
+      const url = await openBillingPortal();
+      window.location.assign(url);
+    } catch (err) {
+      setBusy(false);
+      setError(err instanceof Error ? err.message : "unknown");
+    }
+  };
+
+  return (
+    <section className="mb-12">
+      <div className="text-xs uppercase tracking-[0.22em] text-ink-muted">
+        Plan
+      </div>
+      <h2 className="font-display text-2xl text-ink mt-2 mb-5 tracking-tight">
+        {isPro ? "Pro" : "Free"}
+      </h2>
+      <div className="paper-panel px-5 py-4">
+        {isPro ? (
+          <>
+            <p className="text-sm text-ink">
+              20 GB per transfer · up to 90 days · 100 downloads per link.
+            </p>
+            {renewLabel && (
+              <p className="mt-1 text-xs text-ink-muted font-mono">
+                {statusLabel} {renewLabel}
+              </p>
+            )}
+            <button
+              onClick={handlePortal}
+              disabled={busy}
+              className="mt-4 w-full py-2.5 border border-paper-edge hover:border-ink
+                         text-sm text-ink rounded-sm transition-colors duration-fast ease-crisp
+                         disabled:opacity-40"
+            >
+              {busy ? "Opening portal…" : "Manage subscription →"}
+            </button>
+          </>
+        ) : (
+          <>
+            <p className="text-sm text-ink">
+              2 GB per transfer · 7-day links · 1 download each.
+            </p>
+            <p className="mt-1 text-xs text-ink-muted">
+              Upgrade to send larger files and keep links alive longer.
+            </p>
+            <div className="mt-4 flex gap-2">
+              <button
+                onClick={handleUpgrade}
+                disabled={busy}
+                className="flex-1 py-2.5 bg-ink text-paper text-sm font-medium rounded-sm
+                           hover:bg-signal transition-colors duration-fast ease-crisp
+                           disabled:opacity-40"
+              >
+                {busy ? "Opening checkout…" : "Upgrade to Pro →"}
+              </button>
+              <Link
+                to="/pricing"
+                className="px-4 py-2.5 border border-paper-edge hover:border-ink
+                           text-sm text-ink rounded-sm transition-colors duration-fast ease-crisp
+                           flex items-center"
+              >
+                Compare
+              </Link>
+            </div>
+          </>
+        )}
+        {error && (
+          <p className="mt-3 text-xs text-fail font-mono">
+            {error === "billing_not_configured"
+              ? "Billing is not configured on this instance yet."
+              : error}
+          </p>
+        )}
+      </div>
+    </section>
+  );
+}
+
 type LinkItem = InboxTransfer & {
   filename: string | null;
   keyFrag: string | null;