diff --git a/README.md b/README.md
index 1019530..0817ce2 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,7 @@ Demos with a **Live** link run in your browser at [demos.speechify.ai](https://d
 | [`demos/docs-read-aloud/`](./demos/docs-read-aloud) | TypeScript (zero-dep server) |  | A documentation-style page with a Listen button that reads the article aloud. The button POSTs the text to a tiny server route, which synthesizes it with the Speechify API (key stays server-side) and returns the MP3 for the browser to play. Framework-agnostic. |
 | [`demos/ivr-ssml/`](./demos/ivr-ssml) | Next.js | [Open](https://demos.speechify.ai/ivr-ssml) | A phone-system playground for getting names, account numbers, and product terms right with SSML. Hear plain vs SSML side by side; the API key stays server-side. |
 | [`demos/webpage-audiobook/`](./demos/webpage-audiobook) | Next.js | [Open](https://demos.speechify.ai/webpage-audiobook) | Paste a URL, get narrated audio. The server fetches the article, extracts the text, chunks it on sentence boundaries, and synthesizes each part with the Speechify TTS API. |
+| [`demos/edge-tts/`](./demos/edge-tts) | Next.js | [Open](https://demos.speechify.ai/edge-tts) | A single serverless function streams Speechify TTS audio to the browser — no SDK, key held server-side. Ideal for widgets and light integrations. |
 <!-- DEMOS:END -->
 
 ## Get an API key
diff --git a/demos/edge-tts/.env.example b/demos/edge-tts/.env.example
new file mode 100644
index 0000000..534cec4
--- /dev/null
+++ b/demos/edge-tts/.env.example
@@ -0,0 +1 @@
+SPEECHIFY_API_KEY=your_api_key_here
diff --git a/demos/edge-tts/.gitignore b/demos/edge-tts/.gitignore
new file mode 100644
index 0000000..e838375
--- /dev/null
+++ b/demos/edge-tts/.gitignore
@@ -0,0 +1,9 @@
+node_modules/
+.next/
+.env
+next-env.d.ts
+*.tsbuildinfo
+test-results/
+playwright-report/
+/.playwright/
+.last-run.json
diff --git a/demos/edge-tts/README.md b/demos/edge-tts/README.md
new file mode 100644
index 0000000..1c719aa
--- /dev/null
+++ b/demos/edge-tts/README.md
@@ -0,0 +1,88 @@
+# One-file serverless streaming TTS (Next.js)
+
+A [Next.js](https://nextjs.org) demo whose whole backend is a **single serverless function** that streams Speechify text-to-speech audio straight to the browser. No SDK, no buffering, key held server-side. This is the shape you want for a TTS widget, a light integration, or a copy-paste starting point.
+
+Pairs with the upcoming speechify.ai post "One-file serverless TTS on an edge function".
+
+> **Runtime note.** This is hosted under `demos.speechify.ai`, which is one Vercel project composed of many [Services](https://vercel.com/docs/services), and Services don't support the Edge runtime. So it ships as a **Node serverless function** — which streams the response body just the same. The exact same one file runs on the Edge runtime in a standalone project: flip `runtime` to `"edge"`.
+
+## What you get
+
+- A minimal page: textarea + **Play** button. It POSTs your text to the route and plays the streamed audio.
+- One route, `app/api/stream/route.ts`, that is the entire backend. It pipes the upstream MP3 body straight through as it arrives.
+
+## The one file
+
+The `@speechify/api` SDK is Node-only, so the route calls the REST API directly with `fetch` and streams the response body back unchanged:
+
+```ts
+import { verifyTurnstile } from "../../lib/turnstile";
+
+// "nodejs" here because Vercel Services don't support Edge. Same file runs on
+// the Edge runtime in a standalone project — just set this to "edge".
+export const runtime = "nodejs";
+
+const SPEECHIFY_STREAM_URL = "https://api.speechify.ai/v1/audio/stream";
+
+export async function POST(req: Request) {
+  if (!(await verifyTurnstile(req))) {
+    return new Response("Forbidden", { status: 403 });
+  }
+
+  const { input } = (await req.json().catch(() => ({}))) as { input?: unknown };
+  if (typeof input !== "string" || input.trim() === "") {
+    return new Response("`input` text is required", { status: 400 });
+  }
+
+  const upstream = await fetch(SPEECHIFY_STREAM_URL, {
+    method: "POST",
+    headers: {
+      Authorization: `Bearer ${process.env.SPEECHIFY_API_KEY}`,
+      "content-type": "application/json",
+      Accept: "audio/mpeg",
+    },
+    body: JSON.stringify({
+      input,
+      voice_id: "geffen_32",
+      model: "simba-3.2",
+      audio_format: "mp3",
+    }),
+  });
+
+  if (!upstream.ok || !upstream.body) {
+    const detail = await upstream.text().catch(() => "");
+    return new Response(detail || "Speechify request failed", {
+      status: upstream.status || 502,
+    });
+  }
+
+  return new Response(upstream.body, {
+    headers: { "content-type": "audio/mpeg", "cache-control": "no-store" },
+  });
+}
+```
+
+That is the whole backend.
+
+## Run it yourself
+
+```bash
+cp .env.example .env   # then paste your SPEECHIFY_API_KEY
+pnpm install
+pnpm dev               # http://localhost:8768
+```
+
+Open `http://localhost:8768`, type some text, and click **Play**.
+
+## How the key stays server-side
+
+`SPEECHIFY_API_KEY` is only ever read inside the function via `process.env`, which the browser cannot see. The client talks to the same-origin `/api/stream` route and receives audio bytes — never the key.
+
+## Why streaming
+
+Piping the upstream body straight to the client means the browser can start playing before synthesis finishes, with almost no server code in between. On the Edge runtime (standalone project) you also get fast cold starts and execution close to the user; under Services it runs on Node, and the streaming behaviour is identical.
+
+## Prerequisites
+
+- Node 20 or newer
+- A `SPEECHIFY_API_KEY` from [platform.speechify.ai/api-keys](https://platform.speechify.ai/api-keys)
diff --git a/demos/edge-tts/app/api/stream/route.ts b/demos/edge-tts/app/api/stream/route.ts
new file mode 100644
index 0000000..4aea530
--- /dev/null
+++ b/demos/edge-tts/app/api/stream/route.ts
@@ -0,0 +1,59 @@
+import { verifyTurnstile } from "../../lib/turnstile";
+
+// The whole demo is this one file: a serverless function that streams Speechify
+// TTS audio straight back to the browser. No SDK, no buffering — the upstream
+// MP3 body is piped through as it arrives, so the client can start playing
+// before synthesis finishes.
+//
+// Runtime note: this deploys under demos.speechify.ai, which is one Vercel
+// project composed of many Services, and Services don't support the Edge
+// runtime. So it runs as a Node serverless function — which also streams the
+// response body. The exact same one file runs on `export const runtime = "edge"`
+// in a standalone project; flip the line below if you deploy it on its own.
+export const runtime = "nodejs";
+
+const SPEECHIFY_STREAM_URL = "https://api.speechify.ai/v1/audio/stream";
+
+export async function POST(req: Request) {
+  // Abuse gate. Fails open locally when TURNSTILE_SECRET_KEY is unset.
+  if (!(await verifyTurnstile(req))) {
+    return new Response("Forbidden", { status: 403 });
+  }
+
+  const { input } = (await req.json().catch(() => ({}))) as {
+    input?: unknown;
+  };
+  if (typeof input !== "string" || input.trim() === "") {
+    return new Response("`input` text is required", { status: 400 });
+  }
+
+  const upstream = await fetch(SPEECHIFY_STREAM_URL, {
+    method: "POST",
+    headers: {
+      Authorization: `Bearer ${process.env.SPEECHIFY_API_KEY}`,
+      "content-type": "application/json",
+      Accept: "audio/mpeg",
+    },
+    body: JSON.stringify({
+      input,
+      voice_id: "geffen_32",
+      model: "simba-3.2",
+      audio_format: "mp3",
+    }),
+  });
+
+  if (!upstream.ok || !upstream.body) {
+    const detail = await upstream.text().catch(() => "");
+    return new Response(detail || "Speechify request failed", {
+      status: upstream.status || 502,
+    });
+  }
+
+  // Pipe the streamed audio straight to the client.
+  return new Response(upstream.body, {
+    headers: {
+      "content-type": "audio/mpeg",
+      "cache-control": "no-store",
+    },
+  });
+}
diff --git a/demos/edge-tts/app/globals.css b/demos/edge-tts/app/globals.css
new file mode 100644
index 0000000..c4e9ebe
--- /dev/null
+++ b/demos/edge-tts/app/globals.css
@@ -0,0 +1,190 @@
+/* Speechify brand base — mirrors demos.speechify.ai/site (speechify.ai/brand).
+ * ABC Diatype is licensed and NOT committed; it is loaded cross-origin from
+ * speechify.ai/fonts (served with Access-Control-Allow-Origin: *). Monochrome
+ * palette, thin display type, pill ink buttons, sentence-case voice.
+ * Paste this block at the TOP of the demo's app/globals.css, then make the
+ * demo-specific rules below it reference these tokens (no hardcoded colours). */
+
+@font-face { font-family: "ABCDiatype"; src: url("https://speechify.ai/fonts/ABCDiatype-Thin.woff2") format("woff2"); font-weight: 100; font-style: normal; font-display: swap; }
+@font-face { font-family: "ABCDiatype"; src: url("https://speechify.ai/fonts/ABCDiatype-Light.woff2") format("woff2"); font-weight: 300; font-style: normal; font-display: swap; }
+@font-face { font-family: "ABCDiatype"; src: url("https://speechify.ai/fonts/ABCDiatype-Regular.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
+@font-face { font-family: "ABCDiatype"; src: url("https://speechify.ai/fonts/ABCDiatype-Medium.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; }
+@font-face { font-family: "ABCDiatype"; src: url("https://speechify.ai/fonts/ABCDiatype-Bold.woff2") format("woff2"); font-weight: 700; font-style: normal; font-display: swap; }
+
+:root {
+  --font-sans: "ABCDiatype", ui-sans-serif, system-ui, -apple-system, sans-serif;
+  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, "Cascadia Code", monospace;
+
+  --surface-page: #ffffff;
+  --surface-card: #ffffff;
+  --surface-subtle: #f5f5f5;
+  --surface-raised: #fafafa;
+  --text-primary: #0a0a0a;
+  --text-secondary: #525252;
+  --text-tertiary: #666666;
+  --border-subtle: #e5e5e5;
+  --border-strong: #d1d1d4;
+  --action: #0a0a0a;
+  --action-hover: #2a2a2e;
+  --action-foreground: #fafafa;
+  --focus-ring: rgba(10, 10, 10, 0.22);
+  --success: #00c270;
+  --danger: #b42318;
+  --radius-md: 8px;
+  --radius-lg: 12px;
+  --radius-pill: 9999px;
+}
+
+/* Interactive apps: keep a monochrome dark mapping so night viewers aren't
+ * blinded. Still monochrome, still on-brand (inverted ink/paper). */
+@media (prefers-color-scheme: dark) {
+  :root {
+    --surface-page: #0a0a0a;
+    --surface-card: #101010;
+    --surface-subtle: #161616;
+    --surface-raised: #141414;
+    --text-primary: #fafafa;
+    --text-secondary: #b3b3b3;
+    --text-tertiary: #8a8a8a;
+    --border-subtle: #262626;
+    --border-strong: #3a3a3a;
+    --action: #fafafa;
+    --action-hover: #e5e5e5;
+    --action-foreground: #0a0a0a;
+    --focus-ring: rgba(250, 250, 250, 0.28);
+  }
+}
+
+* { box-sizing: border-box; }
+
+body {
+  margin: 0;
+  padding: 4rem 1.5rem;
+  background: var(--surface-page);
+  color: var(--text-primary);
+  font-family: var(--font-sans);
+  font-weight: 400;
+  line-height: 1.55;
+  -webkit-font-smoothing: antialiased;
+  text-rendering: optimizeLegibility;
+}
+
+main {
+  max-width: 44rem;
+  margin: 0 auto;
+  display: flex;
+  flex-direction: column;
+  gap: 1.75rem;
+}
+
+/* Thin display headings, tight tracking, sentence case (author copy in sentence case). */
+h1 {
+  font-weight: 100;
+  font-size: clamp(2.25rem, 6vw, 3.5rem);
+  line-height: 1.02;
+  letter-spacing: -0.03em;
+  margin: 0 0 0.5rem;
+}
+h2 { font-weight: 300; letter-spacing: -0.01em; margin: 0 0 0.5rem; }
+
+.eyebrow {
+  font-family: var(--font-mono);
+  font-size: 13px;
+  font-weight: 500;
+  letter-spacing: 0.02em;
+  color: var(--text-tertiary);
+  text-transform: none;
+  margin: 0 0 0.75rem;
+}
+
+.lead {
+  max-width: 62ch;
+  color: var(--text-secondary);
+  font-size: 1.0625rem;
+  line-height: 1.55;
+  margin: 0;
+}
+
+a { color: var(--text-primary); text-underline-offset: 2px; }
+
+code, kbd, samp { font-family: var(--font-mono); }
+code {
+  background: var(--surface-subtle);
+  border: 1px solid var(--border-subtle);
+  padding: 0.08em 0.38em;
+  border-radius: 5px;
+  font-size: 0.88em;
+}
+
+.card, .step {
+  background: var(--surface-subtle);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-lg);
+  padding: 1.25rem;
+}
+
+label { display: block; font-size: 0.9rem; color: var(--text-secondary); margin: 0 0 0.5rem; }
+
+input[type="text"], input[type="email"], textarea, select {
+  width: 100%;
+  font: inherit;
+  color: var(--text-primary);
+  background: var(--surface-card);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-md);
+  padding: 0.65rem 0.8rem;
+}
+textarea { resize: vertical; }
+
+input:focus-visible, textarea:focus-visible, select:focus-visible, button:focus-visible {
+  outline: 3px solid var(--focus-ring);
+  outline-offset: 1px;
+}
+
+/* Pill buttons — medium weight only, never 600. */
+.btn, button.btn {
+  font: inherit;
+  font-weight: 500;
+  cursor: pointer;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 0.4rem;
+  border-radius: var(--radius-pill);
+  padding: 0.65rem 1.5rem;
+  border: 1px solid transparent;
+  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
+}
+.btn-primary { background: var(--action); color: var(--action-foreground); }
+.btn-primary:hover:not(:disabled) { background: var(--action-hover); }
+.btn-outline { background: transparent; color: var(--text-primary); border-color: var(--border-strong); }
+.btn-outline:hover:not(:disabled) { background: var(--action); color: var(--action-foreground); border-color: var(--action); }
+.btn:disabled { opacity: 0.55; cursor: default; }
+
+footer {
+  color: var(--text-tertiary);
+  font-size: 0.9rem;
+  border-top: 1px solid var(--border-subtle);
+  padding-top: 1.25rem;
+}
+footer a { color: inherit; }
+
+@media (prefers-reduced-motion: reduce) {
+  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
+}
+
+/* ---- edge-tts demo-specific rules (brand tokens only) ---- */
+
+.status {
+  font-size: 0.9rem;
+  color: var(--text-secondary);
+  min-height: 1.2rem;
+}
+.status[data-tone="error"] {
+  color: var(--danger);
+}
+
+audio {
+  width: 100%;
+  margin-top: 0.9rem;
+}
diff --git a/demos/edge-tts/app/layout.tsx b/demos/edge-tts/app/layout.tsx
new file mode 100644
index 0000000..faf1fce
--- /dev/null
+++ b/demos/edge-tts/app/layout.tsx
@@ -0,0 +1,21 @@
+import type { Metadata } from "next";
+import type { ReactNode } from "react";
+import Script from "next/script";
+import "./globals.css";
+
+export const metadata: Metadata = {
+  title: "One-file serverless edge TTS",
+  description:
+    "A single serverless edge function that streams Speechify text-to-speech audio to the browser.",
+};
+
+export default function RootLayout({ children }: { children: ReactNode }) {
+  return (
+    <html lang="en">
+      <body>
+        <Script src="/turnstile.js" strategy="beforeInteractive" />
+        {children}
+      </body>
+    </html>
+  );
+}
diff --git a/demos/edge-tts/app/lib/turnstile.ts b/demos/edge-tts/app/lib/turnstile.ts
new file mode 100644
index 0000000..6fee926
--- /dev/null
+++ b/demos/edge-tts/app/lib/turnstile.ts
@@ -0,0 +1,37 @@
+// Verifies a Turnstile token against Cloudflare siteverify. Returns true iff
+// the caller is allowed to proceed.
+//
+// Fail-open contract: when TURNSTILE_SECRET_KEY isn't set (local dev, fork
+// deploys, anywhere the operator hasn't configured Turnstile) OR when the
+// siteverify request itself errors, returns true. The alternative is
+// breaking the demo whenever Turnstile isn't configured — a worse experience
+// than leaving the abuse gate briefly open. Real prod hardening would flip
+// this to fail-closed; this is a reference demo.
+const SITEVERIFY_URL =
+  "https://challenges.cloudflare.com/turnstile/v0/siteverify";
+
+export async function verifyTurnstile(req: Request): Promise<boolean> {
+  const secret = process.env.TURNSTILE_SECRET_KEY;
+  if (!secret) return true;
+
+  const token = req.headers.get("x-turnstile-token");
+  if (!token) return false;
+
+  const form = new URLSearchParams();
+  form.set("secret", secret);
+  form.set("response", token);
+  const remoteip = req.headers
+    .get("x-forwarded-for")
+    ?.split(",")[0]
+    ?.trim();
+  if (remoteip) form.set("remoteip", remoteip);
+
+  try {
+    const cf = await fetch(SITEVERIFY_URL, { method: "POST", body: form });
+    if (!cf.ok) return true;
+    const result = (await cf.json()) as { success?: boolean };
+    return Boolean(result?.success);
+  } catch {
+    return true;
+  }
+}
diff --git a/demos/edge-tts/app/page.tsx b/demos/edge-tts/app/page.tsx
new file mode 100644
index 0000000..7deee10
--- /dev/null
+++ b/demos/edge-tts/app/page.tsx
@@ -0,0 +1,132 @@
+"use client";
+
+import { useEffect, useRef, useState } from "react";
+
+const API_BASE = "/edge-tts";
+
+type TurnstileHandle = {
+  enabled: boolean;
+  getToken: (opts?: { timeout?: number }) => Promise<string | null>;
+  reset: () => void;
+};
+
+declare global {
+  interface Window {
+    SpeechifyTurnstile?: {
+      render: (
+        target: string | HTMLElement,
+        options?: unknown,
+      ) => Promise<TurnstileHandle>;
+    };
+  }
+}
+
+export default function Home() {
+  const [text, setText] = useState(
+    "This audio is streaming out of a single serverless edge function.",
+  );
+  const [audioUrl, setAudioUrl] = useState<string | null>(null);
+  const [status, setStatus] = useState("");
+  const [tone, setTone] = useState<"info" | "error">("info");
+  const [busy, setBusy] = useState(false);
+  const [turnstile, setTurnstile] = useState<TurnstileHandle | null>(null);
+  const lastUrl = useRef<string | null>(null);
+
+  useEffect(() => {
+    let cancelled = false;
+    async function init() {
+      while (!window.SpeechifyTurnstile && !cancelled) {
+        await new Promise((r) => setTimeout(r, 30));
+      }
+      if (cancelled) return;
+      const t = await window.SpeechifyTurnstile!.render("#turnstile-container");
+      if (!cancelled) setTurnstile(t);
+    }
+    void init();
+    return () => {
+      cancelled = true;
+    };
+  }, []);
+
+  function say(message: string, t: "info" | "error" = "info") {
+    setStatus(message);
+    setTone(t);
+  }
+
+  async function play() {
+    if (!text.trim()) {
+      say("Type something to speak.", "error");
+      return;
+    }
+    setBusy(true);
+    say("Streaming from the edge…");
+
+    const headers: Record<string, string> = {
+      "content-type": "application/json",
+    };
+    if (turnstile) {
+      const token = await turnstile.getToken();
+      if (token) headers["x-turnstile-token"] = token;
+    }
+
+    const res = await fetch(`${API_BASE}/api/stream`, {
+      method: "POST",
+      headers,
+      body: JSON.stringify({ input: text }),
+    });
+    turnstile?.reset();
+
+    if (!res.ok) {
+      setBusy(false);
+      const detail = await res.text().catch(() => res.statusText);
+      say(detail || "Stream failed.", "error");
+      return;
+    }
+
+    // Read the streamed response as a blob and play it.
+    const blob = await res.blob();
+    if (lastUrl.current) URL.revokeObjectURL(lastUrl.current);
+    const url = URL.createObjectURL(blob);
+    lastUrl.current = url;
+    setAudioUrl(url);
+    setBusy(false);
+    say("Done. Press play.");
+  }
+
+  return (
+    <main>
+      <div>
+        <p className="eyebrow">SpeechifyAI · Edge TTS</p>
+        <h1>One-file serverless edge TTS.</h1>
+      </div>
+      <p className="lead">
+        Type text, hit play. The audio streams out of a single edge function at{" "}
+        <code>app/api/stream/route.ts</code> — no SDK, key held server-side.
+      </p>
+
+      <section className="step">
+        <label htmlFor="text">Text to speak</label>
+        <textarea
+          id="text"
+          rows={4}
+          value={text}
+          onChange={(e) => setText(e.target.value)}
+        />
+        <div id="turnstile-container" />
+        <button
+          className="btn btn-primary"
+          onClick={play}
+          disabled={busy}
+          style={{ marginTop: "0.9rem" }}
+        >
+          {busy ? "Streaming…" : "Play"}
+        </button>
+        {audioUrl && <audio controls autoPlay src={audioUrl} />}
+      </section>
+
+      <p className="status" data-tone={tone}>
+        {status}
+      </p>
+    </main>
+  );
+}
diff --git a/demos/edge-tts/demo.json b/demos/edge-tts/demo.json
new file mode 100644
index 0000000..127ec73
--- /dev/null
+++ b/demos/edge-tts/demo.json
@@ -0,0 +1,6 @@
+{
+  "order": 240,
+  "title": "One-file serverless streaming TTS",
+  "stack": "Next.js",
+  "blurb": "A single serverless function streams Speechify TTS audio to the browser — no SDK, key held server-side. Ideal for widgets and light integrations."
+}
diff --git a/demos/edge-tts/e2e/edge-tts.spec.ts b/demos/edge-tts/e2e/edge-tts.spec.ts
new file mode 100644
index 0000000..3d9c9b3
--- /dev/null
+++ b/demos/edge-tts/e2e/edge-tts.spec.ts
@@ -0,0 +1,47 @@
+import { expect, test } from "@playwright/test";
+
+test.skip(!process.env.SPEECHIFY_API_KEY, "needs SPEECHIFY_API_KEY");
+
+test("streams real audio from the edge function", async ({ page }) => {
+  await page.goto("/edge-tts");
+
+  // Page shell renders.
+  await expect(
+    page.getByRole("heading", { name: /edge tts/i }),
+  ).toBeVisible();
+  const playButton = page.getByRole("button", { name: /play/i });
+  await expect(playButton).toBeVisible();
+  await expect(page.locator("#turnstile-container")).toBeAttached();
+
+  // Short input to keep the synth call small.
+  await page.locator("#text").fill("Edge streaming test.");
+
+  // Kick off the core flow and wait for the real streamed audio response.
+  await playButton.click();
+
+  await page.waitForResponse(
+    (r) =>
+      r.url().includes("/api/stream") &&
+      r.status() === 200 &&
+      (r.headers()["content-type"] ?? "").includes("audio/mpeg"),
+    { timeout: 60_000 },
+  );
+
+  // UI reflects success: button leaves the loading state and the audio
+  // element gets a blob src.
+  await expect(playButton).toHaveText(/play/i);
+  await expect(playButton).toBeEnabled();
+  const audio = page.locator("audio");
+  await expect(audio).toBeVisible();
+  await expect(audio).toHaveAttribute("src", /^blob:/);
+
+  // The client actually received real audio bytes: resolve the blob URL the
+  // player is pointed at and assert it holds a non-trivial MP3 payload.
+  const src = await audio.getAttribute("src");
+  const byteLength = await page.evaluate(async (url) => {
+    const res = await fetch(url!);
+    const buf = await res.arrayBuffer();
+    return buf.byteLength;
+  }, src);
+  expect(byteLength).toBeGreaterThan(1000);
+});
diff --git a/demos/edge-tts/next.config.ts b/demos/edge-tts/next.config.ts
new file mode 100644
index 0000000..0533620
--- /dev/null
+++ b/demos/edge-tts/next.config.ts
@@ -0,0 +1,15 @@
+import type { NextConfig } from "next";
+
+const basePath = "/edge-tts";
+
+const nextConfig: NextConfig = {
+  // The Speechify SDK is server-only. This demo's edge route deliberately does
+  // NOT use the SDK — it calls the REST API with fetch so it can run on the
+  // edge runtime — but this stays in for parity with the other demos.
+  serverExternalPackages: ["@speechify/api"],
+  // Mounted as a Vercel Service under this subpath on demos.speechify.ai.
+  // Standalone (`npm run dev`) also serves under this prefix.
+  basePath,
+};
+
+export default nextConfig;
diff --git a/demos/edge-tts/package.json b/demos/edge-tts/package.json
new file mode 100644
index 0000000..40f8620
--- /dev/null
+++ b/demos/edge-tts/package.json
@@ -0,0 +1,28 @@
+{
+  "name": "edge-tts",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "description": "One-file serverless edge function that streams Speechify TTS audio",
+  "scripts": {
+    "dev": "next dev -p 8768",
+    "build": "next build",
+    "start": "next start -p 8768",
+    "lint": "next lint",
+    "typecheck": "tsc --noEmit",
+    "e2e": "playwright test"
+  },
+  "dependencies": {
+    "@speechify/api": "^3.0.1",
+    "next": "^16.2.10",
+    "react": "^19.2.0",
+    "react-dom": "^19.2.0"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.50.0",
+    "@types/node": "^22.0.0",
+    "@types/react": "^19.2.0",
+    "@types/react-dom": "^19.2.0",
+    "typescript": "^5.6.0"
+  }
+}
diff --git a/demos/edge-tts/playwright.config.ts b/demos/edge-tts/playwright.config.ts
new file mode 100644
index 0000000..8990020
--- /dev/null
+++ b/demos/edge-tts/playwright.config.ts
@@ -0,0 +1,20 @@
+import { defineConfig } from "@playwright/test";
+
+export default defineConfig({
+  testDir: "./e2e",
+  timeout: 90_000,
+  expect: { timeout: 30_000 },
+  reporter: "list",
+  fullyParallel: false,
+  workers: 1,
+  use: {
+    baseURL: "http://localhost:8768",
+    trace: "on-first-retry",
+  },
+  webServer: {
+    command: "pnpm dev",
+    url: "http://localhost:8768/edge-tts",
+    timeout: 120_000,
+    reuseExistingServer: !process.env.CI,
+  },
+});
diff --git a/demos/edge-tts/tsconfig.json b/demos/edge-tts/tsconfig.json
new file mode 100644
index 0000000..637ff2c
--- /dev/null
+++ b/demos/edge-tts/tsconfig.json
@@ -0,0 +1,41 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "ES2022"
+    ],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "moduleResolution": "bundler",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "react-jsx",
+    "incremental": true,
+    "plugins": [
+      {
+        "name": "next"
+      }
+    ],
+    "paths": {
+      "@/*": [
+        "./*"
+      ]
+    }
+  },
+  "include": [
+    "next-env.d.ts",
+    "**/*.ts",
+    "**/*.tsx",
+    ".next/types/**/*.ts",
+    ".next/dev/types/**/*.ts"
+  ],
+  "exclude": [
+    "node_modules"
+  ]
+}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 18c97cf..76375c9 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -43,6 +43,37 @@ importers:
         specifier: ^5.6.0
         version: 5.9.3
 
+  demos/edge-tts:
+    dependencies:
+      '@speechify/api':
+        specifier: ^3.0.1
+        version: 3.0.1
+      next:
+        specifier: ^16.2.10
+        version: 16.2.10(@playwright/test@1.62.1)(react-dom@19.2.7(react@19.2.7))(react@19.2.7)
+      react:
+        specifier: ^19.2.0
+        version: 19.2.7
+      react-dom:
+        specifier: ^19.2.0
+        version: 19.2.7(react@19.2.7)
+    devDependencies:
+      '@playwright/test':
+        specifier: ^1.50.0
+        version: 1.62.1
+      '@types/node':
+        specifier: ^22.0.0
+        version: 22.20.1
+      '@types/react':
+        specifier: ^19.2.0
+        version: 19.2.17
+      '@types/react-dom':
+        specifier: ^19.2.0
+        version: 19.2.3(@types/react@19.2.17)
+      typescript:
+        specifier: ^5.6.0
+        version: 5.9.3
+
   demos/ivr-ssml:
     dependencies:
       '@speechify/api':
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index 861a9dc..b306baa 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -12,3 +12,4 @@ packages:
   - "demos/multilingual-voiceover"
   - "demos/ivr-ssml"
   - "demos/webpage-audiobook"
+  - "demos/edge-tts"
diff --git a/site/public/index.html b/site/public/index.html
index e51f9ec..5eefd39 100644
--- a/site/public/index.html
+++ b/site/public/index.html
@@ -276,7 +276,7 @@
     <!-- End PostHog -->
 
     <!-- JSONLD:START -->
-    <script type="application/ld+json">{"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://demos.speechify.ai/#org","name":"Speechify AI","url":"https://speechify.ai","logo":"https://demos.speechify.ai/apple-touch-icon.png","sameAs":["https://github.com/SpeechifyInc","https://x.com/SpeechifyAI","https://www.linkedin.com/company/speechifyinc/"]},{"@type":"WebSite","@id":"https://demos.speechify.ai/#website","url":"https://demos.speechify.ai/","name":"Speechify Demos","description":"Open-source demos built on the Speechify API — text-to-speech, voice cloning, and real-time voice agents.","publisher":{"@id":"https://demos.speechify.ai/#org"}},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"SpeechifyAI","item":"https://speechify.ai"},{"@type":"ListItem","position":2,"name":"Demos","item":"https://demos.speechify.ai/"}]},{"@type":"ItemList","name":"Speechify API demos","numberOfItems":26,"itemListElement":[{"@type":"ListItem","position":1,"item":{"@type":"SoftwareApplication","name":"Voice cloning web app","description":"Upload a sample, record verified consent in the browser, clone the voice, synthesize with the clone. 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Clone a folder, add your Speechify API key, and run it."}},{"@type":"Question","name":"What do I need to run a demo?","acceptedAnswer":{"@type":"Answer","text":"A Speechify API key from platform.speechify.ai/api-keys, plus the runtime the demo uses (Node, Python, or Go). Each demo's README lists its exact prerequisites."}},{"@type":"Question","name":"Which demos can I try without installing anything?","acceptedAnswer":{"@type":"Answer","text":"Demos marked LIVE run hosted at demos.speechify.ai/<demo-name>. The rest are clone-and-run from the repo."}}]}]}</script>
+    <script type="application/ld+json">{"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://demos.speechify.ai/#org","name":"Speechify AI","url":"https://speechify.ai","logo":"https://demos.speechify.ai/apple-touch-icon.png","sameAs":["https://github.com/SpeechifyInc","https://x.com/SpeechifyAI","https://www.linkedin.com/company/speechifyinc/"]},{"@type":"WebSite","@id":"https://demos.speechify.ai/#website","url":"https://demos.speechify.ai/","name":"Speechify Demos","description":"Open-source demos built on the Speechify API — text-to-speech, voice cloning, and real-time voice agents.","publisher":{"@id":"https://demos.speechify.ai/#org"}},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"SpeechifyAI","item":"https://speechify.ai"},{"@type":"ListItem","position":2,"name":"Demos","item":"https://demos.speechify.ai/"}]},{"@type":"ItemList","name":"Speechify API demos","numberOfItems":27,"itemListElement":[{"@type":"ListItem","position":1,"item":{"@type":"SoftwareApplication","name":"Voice cloning web app","description":"Upload a sample, record verified consent in the browser, clone the voice, synthesize with the clone. 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 <!-- JSONLD:END -->
   </head>
   <body>
@@ -368,7 +368,7 @@ <h2>FAQ</h2>
 
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The API key stays server-side."},{"slug":"captions-speech-marks","repoPath":"demos/captions-speech-marks","title":"Captions from speech marks","stack":"TypeScript (native)","hosted":false,"blurb":"Synthesizes audio and builds a WebVTT caption file from the speech marks the API returns in the same response. Karaoke-highlight HTML demo included."},{"slug":"voice-cloning-narration","repoPath":"demos/voice-cloning-narration","title":"Voice cloning narration","stack":"TypeScript (native)","hosted":false,"blurb":"Clones a voice from a 10-30 sec WAV sample, synthesizes with the new voice, deletes the clone. End-to-end lifecycle."},{"slug":"audiobook-pipeline","repoPath":"demos/audiobook-pipeline","title":"Audiobook pipeline","stack":"Python (SDK)","hosted":false,"blurb":"Chunks long-form text on sentence boundaries, synthesizes each chunk via the Speechify Python SDK, concatenates the MP3s with ffmpeg."},{"slug":"livekit-agent-speechify-python","repoPath":"demos/livekit-agent-speechify-python","title":"LiveKit agent (official plugin)","stack":"Python (LiveKit)","hosted":false,"blurb":"Real-time voice assistant using LiveKit's official livekit-plugins-speechify package for TTS, with Deepgram STT and an OpenAI LLM in a LiveKit AgentSession."},{"slug":"livekit-captions-speechify-python","repoPath":"demos/livekit-captions-speechify-python","title":"LiveKit captions (word timestamps)","stack":"Python (LiveKit)","hosted":false,"blurb":"Read Speechify's word-level timestamps in a LiveKit voice agent by overriding transcription_node, so each spoken word logs its start/end time for synced captions."},{"slug":"livekit-voice-agent-python","repoPath":"demos/livekit-voice-agent-python","title":"LiveKit voice agent","stack":"Python (LiveKit)","hosted":false,"blurb":"Legacy Speechify-owned LiveKit TTS demo, with Deepgram STT and an OpenAI LLM in a LiveKit AgentSession. Prefer the official LiveKit plugin demo for new work."},{"slug":"livekit-voice-agent-node","repoPath":"demos/livekit-voice-agent-node","title":"LiveKit voice agent","stack":"TypeScript (LiveKit)","hosted":false,"blurb":"Legacy Speechify-owned LiveKit TTS demo, with Deepgram STT and an OpenAI LLM in a LiveKit AgentSession."},{"slug":"ssml-emotion-tts","repoPath":"demos/ssml-emotion-tts","title":"SSML emotion TTS","stack":"TypeScript (SDK)","hosted":false,"blurb":"Drives emotion, pauses, prosody, emphasis, and pronunciation with SSML in a single POST /v1/audio/speech request."},{"slug":"web-audio-streaming","repoPath":"demos/web-audio-streaming","title":"Web audio streaming","stack":"TypeScript (browser)","hosted":false,"blurb":"Streams Speechify PCM into the browser Web Audio API for low-latency playback, behind a zero-dep proxy that keeps the key server-side."},{"slug":"deepgram-voice-agent-shim","repoPath":"demos/deepgram-voice-agent-shim","title":"Deepgram voice agent shim","stack":"Go shim + Node","hosted":false,"blurb":"Points Deepgram Voice Agent at the tts-shims OpenAI-compatible proxy so it speaks with a Speechify voice, key held server-side."},{"slug":"vapi-custom-voice","repoPath":"demos/vapi-custom-voice","title":"Vapi custom voice","stack":"Go shim","hosted":false,"blurb":"Points Vapi custom voice at the tts-shims Vapi-compatible proxy so it speaks with Speechify raw PCM, key held server-side."},{"slug":"pipecat-agent-speechify","repoPath":"demos/pipecat-agent-speechify","title":"Pipecat agent","stack":"Python (Pipecat)","hosted":false,"blurb":"Real-time voice pipeline using Pipecat with Deepgram STT, Anthropic Claude, and Speechify TTS through SpeechifyTTSService."},{"slug":"mastra-agent-speechify","repoPath":"demos/mastra-agent-speechify","title":"Mastra voice agent","stack":"TypeScript (Mastra)","hosted":false,"blurb":"Text-in, speech-out Mastra Agent using an OpenAI LLM for replies and Speechify's simba-3.2 model for TTS via `@mastra/voice-speechify`."},{"slug":"voice-agent-showcase","repoPath":"demos/voice-agent-showcase","title":"Voice agent capability showcase","stack":"Cloudflare Workers","hosted":false,"blurb":"One page, ten live Voice Agents API demos: calendar booking, policy-bound support, a page copilot, form intake, US outbound calls capped by the agent's own max_call_duration_seconds, a voice gallery, mid-call language handoff, cross-call memory, a grounded knowledge base, and dual-control troubleshooting."},{"slug":"ci-pipeline-tts","repoPath":"demos/ci-pipeline-tts","title":"CI pipeline that speaks","stack":"TypeScript (SDK)","hosted":false,"blurb":"Wire the Speechify TTS API into a CI pipeline so build, test, and deploy events are spoken aloud or dropped into a channel as audio."},{"slug":"rss-audio-digest","repoPath":"demos/rss-audio-digest","title":"RSS to daily audio digest","stack":"TypeScript (SDK)","hosted":false,"blurb":"Point it at any RSS feed and it reads today's items into a spoken digest: fetches the feed, concatenates titles and snippets into one script, synthesizes each chunk via the Speechify API, and stitches the parts into a single daily audio file with ffmpeg."},{"slug":"vercel-ai-sdk","repoPath":"demos/vercel-ai-sdk","title":"Vercel AI SDK","stack":"TypeScript (Vercel AI SDK)","hosted":false,"blurb":"Speechify TTS through the Vercel AI SDK's unified `generateSpeech` interface via the official `@speechify/vercel` provider — one-line swap from OpenAI/ElevenLabs, plus word-level speech marks from `providerMetadata`."},{"slug":"puter-txt2speech","repoPath":"demos/puter-txt2speech","title":"Speechify TTS in Puter","stack":"HTML (puter.js)","hosted":false,"blurb":"Speaks with a Simba 3.2 voice via the Speechify provider in Puter's puter.ai.txt2speech() — one static page, your key configured once on the Puter instance."},{"slug":"slack-bot-speechify","repoPath":"demos/slack-bot-speechify","title":"Slack bot that reads aloud","stack":"TypeScript (Socket Mode)","hosted":false,"blurb":"A Slack bot that reads every new message in a channel aloud: on each message it synthesizes the text with the Speechify API and posts the MP3 back as a file. Socket Mode means no public tunnel."},{"slug":"discord-bot-speechify","repoPath":"demos/discord-bot-speechify","title":"Discord bot that speaks","stack":"TypeScript (discord.js)","hosted":false,"blurb":"A Discord slash-command bot: /speak <text> synthesizes the text with the Speechify API and posts the MP3 into the channel. The command registers automatically on first run."},{"slug":"docs-read-aloud","repoPath":"demos/docs-read-aloud","title":"Read-aloud for a docs site","stack":"TypeScript (zero-dep server)","hosted":false,"blurb":"A documentation-style page with a Listen button that reads the article aloud. The button POSTs the text to a tiny server route, which synthesizes it with the Speechify API (key stays server-side) and returns the MP3 for the browser to play. Framework-agnostic."},{"slug":"ivr-ssml","repoPath":"demos/ivr-ssml","title":"IVR pronunciation with SSML","stack":"Next.js","hosted":true,"blurb":"A phone-system playground for getting names, account numbers, and product terms right with SSML. Hear plain vs SSML side by side; the API key stays server-side."},{"slug":"webpage-audiobook","repoPath":"demos/webpage-audiobook","title":"Turn a webpage into an audiobook","stack":"Next.js","hosted":true,"blurb":"Paste a URL, get narrated audio. The server fetches the article, extracts the text, chunks it on sentence boundaries, and synthesizes each part with the Speechify TTS API."},{"slug":"edge-tts","repoPath":"demos/edge-tts","title":"One-file serverless streaming TTS","stack":"Next.js","hosted":true,"blurb":"A single serverless function streams Speechify TTS audio to the browser — no SDK, key held server-side. Ideal for widgets and light integrations."}];
 /* DEMOS_DATA:END */
     </script>
     <script>
diff --git a/vercel.json b/vercel.json
index 89eaf6f..611be2b 100644
--- a/vercel.json
+++ b/vercel.json
@@ -25,6 +25,10 @@
     "webpage-audiobook": {
       "root": "demos/webpage-audiobook/",
       "framework": "nextjs"
+    },
+    "edge-tts": {
+      "root": "demos/edge-tts/",
+      "framework": "nextjs"
     }
   },
   "rewrites": [
@@ -52,6 +56,10 @@
       "source": "/webpage-audiobook/:path*",
       "destination": { "service": "webpage-audiobook" }
     },
+    {
+      "source": "/edge-tts/:path*",
+      "destination": { "service": "edge-tts" }
+    },
     {
       "source": "/",
       "destination": {