diff --git a/packages/element-web-module-api/element-web-module-api.api.md b/packages/element-web-module-api/element-web-module-api.api.md
index 754a4d2eec..6d6403735e 100644
--- a/packages/element-web-module-api/element-web-module-api.api.md
+++ b/packages/element-web-module-api/element-web-module-api.api.md
@@ -5,7 +5,6 @@
 ```ts
 
 import { JSX } from 'react';
-import { MatrixEvent } from 'matrix-js-sdk/lib/matrix';
 import { ModuleApi } from '@matrix-org/react-sdk-module-api';
 import { Root } from 'react-dom/client';
 import { RuntimeModule } from '@matrix-org/react-sdk-module-api';
@@ -23,6 +22,7 @@ export interface AliasCustomisations {
 export interface Api extends LegacyModuleApiExtension, LegacyCustomisationsApiExtension {
     readonly config: ConfigApi;
     createRoot(element: Element): Root;
+    // @alpha
     readonly customComponents: CustomComponentsApi;
     readonly i18n: I18nApi;
     readonly rootNode: HTMLElement;
@@ -60,10 +60,8 @@ export interface ConfigApi {
     get<K extends keyof Config = never>(key?: K): Config | Config[K];
 }
 
-// @public
+// @alpha
 export interface CustomComponentsApi {
-    // Warning: (ae-incompatible-release-tags) The symbol "registerMessageRenderer" is marked as @public, but its signature references "CustomMessageRenderFunction" which is marked as @alpha
-    // Warning: (ae-incompatible-release-tags) The symbol "registerMessageRenderer" is marked as @public, but its signature references "CustomMessageRenderHints" which is marked as @alpha
     registerMessageRenderer(eventTypeOrFilter: string | ((mxEvent: MatrixEvent) => boolean), renderer: CustomMessageRenderFunction, hints?: CustomMessageRenderHints): void;
 }
 
@@ -134,6 +132,18 @@ export interface LifecycleCustomisations {
     onLoggedOutAndStorageCleared?(): void;
 }
 
+// @alpha
+export interface MatrixEvent {
+    content: Record<string, unknown>;
+    eventId: string;
+    originServerTs: number;
+    roomId: string;
+    sender: string;
+    stateKey?: string;
+    type: string;
+    unsigned: Record<string, unknown>;
+}
+
 // @alpha @deprecated (undocumented)
 export interface Media {
     // (undocumented)
diff --git a/packages/element-web-module-api/package.json b/packages/element-web-module-api/package.json
index ed0b67418a..b9432f9e01 100644
--- a/packages/element-web-module-api/package.json
+++ b/packages/element-web-module-api/package.json
@@ -38,7 +38,6 @@
         "@types/react-dom": "^19.0.4",
         "@types/semver": "^7.5.8",
         "@vitest/coverage-v8": "^3.0.4",
-        "matrix-js-sdk": "^37.5.0",
         "matrix-web-i18n": "^3.3.0",
         "semver": "^7.6.3",
         "typescript": "^5.7.3",
@@ -51,7 +50,6 @@
         "@matrix-org/react-sdk-module-api": "*",
         "@types/react": "*",
         "@types/react-dom": "*",
-        "matrix-js-sdk": "*",
         "matrix-web-i18n": "*",
         "react": "^19"
     },
diff --git a/packages/element-web-module-api/src/api/custom-components.ts b/packages/element-web-module-api/src/api/custom-components.ts
index 794786538a..becc0f1992 100644
--- a/packages/element-web-module-api/src/api/custom-components.ts
+++ b/packages/element-web-module-api/src/api/custom-components.ts
@@ -6,7 +6,7 @@ Please see LICENSE files in the repository root for full details.
 */
 
 import type { JSX } from "react";
-import type { MatrixEvent } from "matrix-js-sdk/lib/matrix";
+import type { MatrixEvent } from "../models/event";
 
 /**
  * Properties for all message components.
@@ -48,7 +48,7 @@ export type CustomMessageRenderHints = {
 
 /**
  * Function used to render a message component.
- * @alpha Unlikely to change
+ * @alpha Subject to change.
  */
 export type CustomMessageRenderFunction = (
     /**
@@ -63,7 +63,7 @@ export type CustomMessageRenderFunction = (
 
 /**
  * API for inserting custom components into Element.
- * @public
+ * @alpha Subject to change.
  */
 export interface CustomComponentsApi {
     /**
diff --git a/packages/element-web-module-api/src/api/index.ts b/packages/element-web-module-api/src/api/index.ts
index 3e9d4d072f..399d807a14 100644
--- a/packages/element-web-module-api/src/api/index.ts
+++ b/packages/element-web-module-api/src/api/index.ts
@@ -90,7 +90,7 @@ export interface Api extends LegacyModuleApiExtension, LegacyCustomisationsApiEx
 
     /**
      * The custom message component API.
-     * @public
+     * @alpha
      */
     readonly customComponents: CustomComponentsApi;
     /**
diff --git a/packages/element-web-module-api/src/index.ts b/packages/element-web-module-api/src/index.ts
index 4fbf15e9ba..0a7337ec21 100644
--- a/packages/element-web-module-api/src/index.ts
+++ b/packages/element-web-module-api/src/index.ts
@@ -9,6 +9,7 @@ export { ModuleLoader, ModuleIncompatibleError } from "./loader";
 export type { Api, Module, ModuleFactory } from "./api";
 export type { Config, ConfigApi } from "./api/config";
 export type { I18nApi, Variables, Translations } from "./api/i18n";
+export type * from "./models/event";
 export type * from "./api/custom-components";
 export type * from "./api/legacy-modules";
 export type * from "./api/legacy-customisations";
diff --git a/packages/element-web-module-api/src/models/event.ts b/packages/element-web-module-api/src/models/event.ts
new file mode 100644
index 0000000000..b75606090e
--- /dev/null
+++ b/packages/element-web-module-api/src/models/event.ts
@@ -0,0 +1,48 @@
+/*
+Copyright 2025 New Vector Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+/**
+ * Representation of a Matrix event, as specified by the client server specification.
+ * @alpha Subject to change.
+ * @see https://spec.matrix.org/v1.14/client-server-api/#room-event-format
+ */
+export interface MatrixEvent {
+    /**
+     * The event ID of this event.
+     */
+    eventId: string;
+    /**
+     * The room ID which contains this event.
+     */
+    roomId: string;
+    /**
+     * The Matrix ID of the user who sent this event.
+     */
+    sender: string;
+    /**
+     * The content of the event.
+     * If the event was encrypted, this is the decrypted content.
+     */
+    content: Record<string, unknown>;
+    /**
+     * Contains optional extra information about the event.
+     */
+    unsigned: Record<string, unknown>;
+    /**
+     * The type of the event.
+     */
+    type: string;
+    /**
+     * The state key of the event.
+     * If this key is set, including `""` then the event is a state event.
+     */
+    stateKey?: string;
+    /**
+     * Timestamp (in milliseconds since the unix epoch) on originating homeserver when this event was sent.
+     */
+    originServerTs: number;
+}