diff --git a/CHANGELOG.md b/CHANGELOG.md
index daf518e..d41876c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,31 @@ All notable changes to the `stream-connect-sdk` npm package. The
 companion React Native hook (`stream-connect-sdk-hook`) is on its own
 release line; see [`sdk-hook/docs/README.md`](./sdk-hook/docs/README.md).
 
+## 0.8.2
+
+### Refuse to initialize on insecure (plain HTTP) host pages
+
+`StreamConnect()` now checks `window.isSecureContext` at init and
+refuses to mount the SDK if the host page is served over plain HTTP
+from a non-loopback host. The browser-level secure-context check is
+true on HTTPS and on the loopback hosts (`localhost`, `127.0.0.1`,
+`[::1]`) — same set the new server-side CORS policy allows — so
+local development against `vite`, `webpack-dev-server`, etc. is
+unaffected.
+
+The previous behavior on a plain-HTTP page was a generic
+CORS-blocked error in the browser console on the first
+`/sdk-api/*` request, with no actionable explanation. The SDK now
+fails fast with a clear console error, calls the optional
+`handleInitErrors` callback with the same message, and links to
+the [origin-policy docs](https://developers.tpastream.com/connect/origin-policy)
+explaining the requirement and how to fix it.
+
+Members were never charged the network round-trip on a broken
+plain-HTTP integration in the first place, so the practical effect
+is shifting the error from "browser console mystery" to "init-time
+diagnostic that names the problem."
+
 ## 0.8.1
 
 ### Handle expired connectAccessToken without a confusing error
diff --git a/assets/sdk/entries/sdk-core.tsx b/assets/sdk/entries/sdk-core.tsx
index c642ce6..00f1883 100644
--- a/assets/sdk/entries/sdk-core.tsx
+++ b/assets/sdk/entries/sdk-core.tsx
@@ -9,7 +9,31 @@ import type { SDKInitOptions } from '../types-init';
 // stylesheet so customers driving their own UI via the renderXxx
 // callbacks aren't forced to ship our ~50 KB of Tailwind output.
 
-const VERSION = '0.8.1';
+const VERSION = '0.8.2';
+
+const ORIGIN_POLICY_DOCS_URL =
+  'https://developers.tpastream.com/connect/origin-policy';
+
+// `window.isSecureContext` is the W3C primitive browsers use to gate
+// any API that handles sensitive data (WebAuthn, getUserMedia, service
+// workers). It is true on HTTPS pages and on the loopback hosts the
+// browser treats as secure — `localhost`, `127.0.0.1`, `[::1]`, file://,
+// chrome-extension:// — and false for plain `http://` everywhere else.
+//
+// We mirror that on the server (stream/security/sdk_cors.py) — the
+// `/sdk-api/*` CORS regex only echoes Access-Control-Allow-Origin for
+// HTTPS or loopback HTTP. So an integration loaded into a plain-HTTP
+// host page would hit a generic browser CORS-blocked error on the very
+// first API call, with no actionable explanation. Catch it here at
+// init() instead and report it clearly to the console + handleInitErrors
+// so the developer goes straight to the docs.
+const isSecureSDKContext = (): boolean => {
+  // SSR / non-browser harnesses (Jest with jsdom unset, etc.) can't
+  // be evaluated — fall through, the later `document.querySelector`
+  // path errors with its own message.
+  if (typeof window === 'undefined') return true;
+  return window.isSecureContext;
+};
 
 // Track one React root per container element. Some host pages call
 // StreamConnect() more than once against the same `el` (e.g. on a
@@ -181,6 +205,15 @@ const StreamConnect = (options: SDKInitOptions) => {
     return;
   }
 
+  if (!isSecureSDKContext()) {
+    const origin =
+      typeof window !== 'undefined' ? window.location.origin : '(unknown)';
+    const msg = `[stream-connect-sdk] init failed: host page must be served over HTTPS (or from http://localhost, http://127.0.0.1, or http://[::1] for local development). The current page origin ${origin} is insecure, and the SDK transmits member credentials — sending those over plain HTTP would expose them in transit. See ${ORIGIN_POLICY_DOCS_URL} for the fix.`;
+    console.error(msg);
+    options.handleInitErrors?.(new Error(msg));
+    return;
+  }
+
   console.log(`TPAStream Connect SDK v${VERSION}`);
 
   const normalized = normalizeOptions(options);
diff --git a/docs/migration-0.7-to-0.8.md b/docs/migration-0.7-to-0.8.md
index d5f832c..d58a35c 100644
--- a/docs/migration-0.7-to-0.8.md
+++ b/docs/migration-0.7-to-0.8.md
@@ -91,6 +91,12 @@ If you deliberately want the legacy fallthrough behavior — e.g. you're doing c
 
 If you use `renderChoosePayer={false}` / `renderPayerForm={false}` / `renderEndWidget={false}` and drive those steps from `doneChoosePayer` / `doneCreatedForm` / `doneEasyEnroll`, the data passed into your callbacks is unchanged.
 
+### 9. Host page must be HTTPS (0.8.2)
+
+Starting in 0.8.2, `StreamConnect()` refuses to mount if the host page is served over plain `http://` from a non-loopback host. `localhost`, `127.0.0.1`, and `[::1]` are still allowed so local development is unaffected. Staging or internal hostnames served over plain HTTP are not.
+
+If you embed the SDK in a member-facing page that's currently on plain HTTP, that page must move to HTTPS before 0.8.x will mount. See the [Origin Policy doc](https://developers.tpastream.com/connect/origin-policy) for the full rules, the exact console error developers will see, and how to fix it.
+
 ## What you do NOT need to do
 
 - You do not need to add a `theme` option. The default appearance applies automatically.
diff --git a/package.json b/package.json
index f7ad3f0..d8ee6dc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "stream-connect-sdk",
-  "version": "0.8.1",
+  "version": "0.8.2",
   "description": "A JavaScript SDK implementing TPAStream's Connect Platform",
   "scripts": {
     "build": "webpack --config webpack.prod-sdk.js --mode=production",