diff --git a/src/custom/jstz-signer.ts b/src/custom/jstz-signer.ts
index 00e736a..bf160ae 100644
--- a/src/custom/jstz-signer.ts
+++ b/src/custom/jstz-signer.ts
@@ -1,33 +1,40 @@
 import Jstz from '../index';
 
 // Extension events
-enum ExtensionRequestEvent {
-  SIGN = 'JSTZ_SIGNER_SIGN_REQUEST',
-  GET_ADDRESS = 'JSTZ_SIGNER_GET_ADDRESS_REQUEST',
+enum SignerRequestEventTypes {
+  CHECK_STATUS = 'JSTZ_CHECK_EXTENSION_AVAILABILITY_REQUEST_TO_EXTENSION',
+  SIGN = 'JSTZ_SIGN_REQUEST_TO_EXTENSION',
+  GET_ADDRESS = 'JSTZ_GET_ADDRESS_REQUEST_TO_EXTENSION',
 }
 
-enum ExtensionResponseEvent {
-  SIGN_RESPONSE = 'JSTZ_SIGNER_SIGN_RESPONSE',
-  GET_ADDRESS_RESPONSE = 'JSTZ_SIGNER_GET_ADDRESS_RESPONSE',
+enum SignerResponseEventTypes {
+  CHECK_STATUS_RESPONSE = 'JSTZ_CHECK_EXTENSION_AVAILABILITY_RESPONSE_FROM_EXTENSION',
+  SIGN_RESPONSE = 'JSTZ_SIGN_RESPONSE_FROM_EXTENSION',
+  GET_ADDRESS_RESPONSE = 'JSTZ_GET_ADDRESS_RESPONSE_FROM_EXTENSION',
 }
 
 interface ExtensionError {
+  type: SignerResponseEventTypes;
   error: string;
 }
 
 // Signer requests
-interface SignRequest {
-  type: ExtensionRequestEvent.SIGN;
-  content: Jstz.Operation.RunFunction;
+interface SignRequestCall {
+  type: SignerRequestEventTypes.SIGN;
+  content: unknown;
 }
 
-interface GetSignerAddressRequest {
-  type: ExtensionRequestEvent.GET_ADDRESS;
+interface CheckStatusCall {
+  type: SignerRequestEventTypes.CHECK_STATUS;
+}
+
+interface GetSignerAddressCall {
+  type: SignerRequestEventTypes.GET_ADDRESS;
 }
 
 // Extension responses
 interface ExtensionResponse<T = unknown> {
-  type: ExtensionResponseEvent;
+  type: SignerResponseEventTypes;
   data: T;
 }
 
@@ -42,16 +49,32 @@ interface GetAddressResponse {
   accountAddress: string;
 }
 
+interface CheckStatusResponse {
+  success: boolean;
+}
+
 /**
  * An event dispatcher for Signer extensions
  */
 export class JstzSigner {
   eventTarget: EventTarget;
-
   constructor(eventTarget: EventTarget) {
     this.eventTarget = eventTarget;
   }
 
+  private getResponseType(reqType: SignerRequestEventTypes) {
+    switch (reqType) {
+      case SignerRequestEventTypes.SIGN:
+        return SignerResponseEventTypes.SIGN_RESPONSE;
+      case SignerRequestEventTypes.GET_ADDRESS:
+        return SignerResponseEventTypes.GET_ADDRESS_RESPONSE;
+      case SignerRequestEventTypes.CHECK_STATUS:
+        return SignerResponseEventTypes.CHECK_STATUS_RESPONSE;
+      default:
+        throw new Error('Unknown request type');
+    }
+  }
+
   /**
    * Dispatch a Signer request event on `this.eventTarget`.
    * Returns a Promise listening for the corresponding `ExtensionResponse` event.
@@ -60,38 +83,44 @@ export class JstzSigner {
    * on `this.eventTarget` and emit an `ExtensionResponse<T>` if succesfully handled or
    * `ExtensionError` if not
    */
-  callSignerExtension<T = SignResponse | GetAddressResponse>(
-    payload: SignRequest | GetSignerAddressRequest,
+  public callSignerExtension<T = SignResponse | GetAddressResponse | CheckStatusResponse>(
+    payload: SignRequestCall | GetSignerAddressCall | CheckStatusCall,
+    options?: {
+      timeout?: number;
+    },
   ): Promise<ExtensionResponse<T>> {
-    function getResponseType(reqType: ExtensionRequestEvent): ExtensionResponseEvent {
-      switch (reqType) {
-        case ExtensionRequestEvent.SIGN:
-          return ExtensionResponseEvent.SIGN_RESPONSE;
-        case ExtensionRequestEvent.GET_ADDRESS:
-          return ExtensionResponseEvent.GET_ADDRESS_RESPONSE;
-        default:
-          throw new Error('Unknown request type');
-      }
-    }
-
-    // @ts-ignore
+    // @ts-expect-error - CustomEvent is available in ts DOM lib
     const event = new CustomEvent<typeof payload>(payload.type, {
       detail: payload,
     });
 
     this.eventTarget.dispatchEvent(event);
 
+    const { timeout } = options || {};
+
     return new Promise<ExtensionResponse<T>>((resolve, reject) => {
+      let eventFired = false;
+
+      if (timeout) {
+        setTimeout(() => {
+          if (!eventFired) {
+            reject(new Error('Extension is not responding'));
+          }
+        }, timeout);
+      }
+
       this.eventTarget.addEventListener(
-        getResponseType(payload.type),
-        // @ts-ignore
+        this.getResponseType(payload.type),
+        // @ts-expect-error - CustomEvent is available in ts DOM lib
         ((event: CustomEvent<ExtensionError | ExtensionResponse<T>>) => {
+          eventFired = true;
+
           if ('error' in event.detail) {
             reject(new Error(event.detail.error));
           } else {
             resolve(event.detail);
           }
-          // @ts-ignore
+          // @ts-expect-error - EventListener is available in ts DOM lib
         }) as EventListener,
         { once: true },
       );
@@ -99,17 +128,15 @@ export class JstzSigner {
   }
 }
 
-export declare namespace JstzSigner {
-  export {
-    ExtensionResponseEvent,
-    ExtensionRequestEvent,
-    type ExtensionError,
-    type SignRequest,
-    type GetSignerAddressRequest,
-    type ExtensionResponse,
-    type SignResponse,
-    type GetAddressResponse,
-  };
-}
-
-export default JstzSigner;
+export {
+  SignerResponseEventTypes,
+  SignerRequestEventTypes,
+  type ExtensionError,
+  type SignRequestCall,
+  type GetSignerAddressCall,
+  type ExtensionResponse,
+  type SignResponse,
+  type GetAddressResponse,
+  type CheckStatusCall,
+  type CheckStatusResponse,
+};
diff --git a/tests/custom/jstz-signer.test.ts b/tests/custom/jstz-signer.test.ts
new file mode 100644
index 0000000..d909e42
--- /dev/null
+++ b/tests/custom/jstz-signer.test.ts
@@ -0,0 +1,67 @@
+import {
+  JstzSigner,
+  SignerRequestEventTypes,
+  SignerResponseEventTypes,
+  CheckStatusCall,
+  SignRequestCall,
+  GetSignerAddressCall,
+} from '../../src/custom/jstz-signer';
+
+describe('JstzSigner', () => {
+  let eventTarget: EventTarget;
+  let signer: JstzSigner;
+
+  beforeEach(() => {
+    eventTarget = new EventTarget();
+    signer = new JstzSigner(eventTarget);
+  });
+
+  test('dispatches the correct event', () => {
+    const dispatchSpy = jest.spyOn(eventTarget, 'dispatchEvent');
+    const payload: CheckStatusCall = { type: SignerRequestEventTypes.CHECK_STATUS };
+
+    signer.callSignerExtension(payload);
+
+    expect(dispatchSpy).toHaveBeenCalledTimes(1);
+    expect(dispatchSpy).toHaveBeenCalledWith(
+      expect.objectContaining({
+        type: SignerRequestEventTypes.CHECK_STATUS,
+        detail: payload,
+      }),
+    );
+  });
+
+  test('resolves with the correct response', async () => {
+    const payload: CheckStatusCall = { type: SignerRequestEventTypes.CHECK_STATUS };
+    const response = { type: SignerResponseEventTypes.CHECK_STATUS_RESPONSE, data: { success: true } };
+
+    setTimeout(() => {
+      // @ts-expect-error - CustomEvent is available in ts DOM lib
+      const event = new CustomEvent(SignerResponseEventTypes.CHECK_STATUS_RESPONSE, { detail: response });
+      eventTarget.dispatchEvent(event);
+    }, 10);
+
+    await expect(signer.callSignerExtension(payload)).resolves.toEqual(response);
+  });
+
+  test('rejects with an error if the response contains an error', async () => {
+    const payload: SignRequestCall = { type: SignerRequestEventTypes.SIGN, content: null };
+    const errorResponse = { type: SignerResponseEventTypes.SIGN_RESPONSE, error: 'Some error occurred' };
+
+    setTimeout(() => {
+      // @ts-expect-error - CustomEvent is available in ts DOM lib
+      const event = new CustomEvent(SignerResponseEventTypes.SIGN_RESPONSE, { detail: errorResponse });
+      eventTarget.dispatchEvent(event);
+    }, 10);
+
+    await expect(signer.callSignerExtension(payload)).rejects.toThrow('Some error occurred');
+  });
+
+  test('rejects if no response is received within the timeout', async () => {
+    const payload: GetSignerAddressCall = { type: SignerRequestEventTypes.GET_ADDRESS };
+
+    await expect(signer.callSignerExtension(payload, { timeout: 50 })).rejects.toThrow(
+      'Extension is not responding',
+    );
+  });
+});