diff --git a/src/index.ts b/src/index.ts
index e8df699..9214807 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,5 @@
 export * as fixtures from "./fixtures";
 export * as gitDaemon from "./gitDaemon";
 export * as githubWebhooks from "./githubWebhooks";
+export * as matrixHelpers from "./matrixHelpers";
 export * as mockServer from "./mockServer";
diff --git a/src/matrixHelpers.ts b/src/matrixHelpers.ts
new file mode 100644
index 0000000..15cd1cc
--- /dev/null
+++ b/src/matrixHelpers.ts
@@ -0,0 +1,141 @@
+import { validatedFetch } from "@eng-automation/js";
+import Joi from "joi";
+
+type AccessTokenResponse = { access_token: string };
+
+export async function getAccessToken(matrixUrl: string, params: { user: string; password: string }): Promise<string> {
+  const response = await validatedFetch<AccessTokenResponse>(
+    `${matrixUrl}/_matrix/client/v3/login`,
+    Joi.object<AccessTokenResponse>({ access_token: Joi.string().required() }),
+    {
+      init: {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ type: "m.login.password", user: params.user, password: params.password }),
+      },
+    },
+  );
+
+  return response.access_token;
+}
+
+type RoomResponse = { room_id: string };
+
+export async function createRoom(
+  matrixUrl: string,
+  params: {
+    roomAliasName: string;
+    accessToken: string;
+  },
+): Promise<string> {
+  const { room_id: roomId } = await validatedFetch<RoomResponse>(
+    `${matrixUrl}/_matrix/client/v3/createRoom?access_token=${params.accessToken}`,
+    Joi.object<RoomResponse>({ room_id: Joi.string().required() }),
+    {
+      init: {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ room_alias_name: params.roomAliasName }),
+      },
+    },
+  );
+
+  return roomId;
+}
+
+export async function inviteUser(
+  matrixUrl: string,
+  params: {
+    roomId: string;
+    accessToken: string;
+    userId: string;
+  },
+): Promise<void> {
+  await validatedFetch(
+    `${matrixUrl}/_matrix/client/v3/rooms/${params.roomId}/invite?access_token=${params.accessToken}`,
+    Joi.any(),
+    {
+      init: {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ user_id: params.userId }),
+      },
+    },
+  );
+}
+
+export async function joinRoom(
+  matrixUrl: string,
+  params: {
+    roomId: string;
+    accessToken: string;
+  },
+): Promise<void> {
+  await validatedFetch(
+    `${matrixUrl}/_matrix/client/v3/rooms/${params.roomId}/join?access_token=${params.accessToken}`,
+    Joi.any(),
+    { init: { method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify({}) } },
+  );
+}
+
+export async function postMessage(
+  matrixUrl: string,
+  params: {
+    roomId: string;
+    accessToken: string;
+    body: string;
+  },
+): Promise<void> {
+  await validatedFetch(
+    `${matrixUrl}/_matrix/client/v3/rooms/${params.roomId}/send/m.room.message?access_token=${params.accessToken}`,
+    Joi.any(),
+    {
+      init: {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ msgtype: "m.text", body: params.body }),
+      },
+    },
+  );
+}
+
+type LatestMessageResponse = {
+  chunk: [
+    {
+      sender: string;
+      content: { body: string; formatted_body: string };
+    },
+  ];
+};
+
+export async function getLatestMessage(
+  matrixUrl: string,
+  params: {
+    roomId: string;
+    accessToken: string;
+  },
+): Promise<{
+  sender: string;
+  body: string;
+  formattedBody: string;
+}> {
+  const res = await validatedFetch<LatestMessageResponse>(
+    `${matrixUrl}/_matrix/client/v3/rooms/${params.roomId}/messages?dir=b&limit=1&access_token=${params.accessToken}`,
+    Joi.object<LatestMessageResponse>({
+      chunk: Joi.array().items(
+        Joi.object({
+          sender: Joi.string().required(),
+          content: Joi.object({ body: Joi.string().required() }),
+          formatted_body: Joi.object({ formatted_body: Joi.string().required() }),
+        }).required(),
+      ),
+    }),
+    { init: { headers: { "Content-Type": "application/json" } } },
+  );
+
+  return {
+    sender: res.chunk[0].sender,
+    body: res.chunk[0].content.body,
+    formattedBody: res.chunk[0].content.formatted_body,
+  };
+}