diff --git a/packages/backend/src/controllers/api/v1/apps/get-action-substeps.js b/packages/backend/src/controllers/api/v1/apps/get-action-substeps.js
new file mode 100644
index 00000000..6b985bdc
--- /dev/null
+++ b/packages/backend/src/controllers/api/v1/apps/get-action-substeps.js
@@ -0,0 +1,11 @@
+import App from '../../../../models/app.js';
+import { renderObject } from '../../../../helpers/renderer.js';
+
+export default async (request, response) => {
+  const substeps = await App.findActionSubsteps(
+    request.params.appKey,
+    request.params.actionKey
+  );
+
+  renderObject(response, substeps);
+};
diff --git a/packages/backend/src/controllers/api/v1/apps/get-action-substeps.test.js b/packages/backend/src/controllers/api/v1/apps/get-action-substeps.test.js
new file mode 100644
index 00000000..44676d9e
--- /dev/null
+++ b/packages/backend/src/controllers/api/v1/apps/get-action-substeps.test.js
@@ -0,0 +1,52 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import request from 'supertest';
+import App from '../../../../models/app';
+import app from '../../../../app.js';
+import createAuthTokenByUserId from '../../../../helpers/create-auth-token-by-user-id';
+import { createUser } from '../../../../../test/factories/user';
+import getActionSubstepsMock from '../../../../../test/mocks/rest/api/v1/apps/get-action-substeps.js';
+
+describe('GET /api/v1/apps/:appKey/actions/:actionKey/substeps', () => {
+  let currentUser, exampleApp, token;
+
+  beforeEach(async () => {
+    currentUser = await createUser();
+    token = createAuthTokenByUserId(currentUser.id);
+    exampleApp = await App.findOneByKey('github');
+  });
+
+  it('should return the app auth info', async () => {
+    const actions = await App.findActionsByKey('github');
+    const exampleAction = actions.find(
+      (action) => action.key === 'createIssue'
+    );
+
+    const endpointUrl = `/api/v1/apps/${exampleApp.key}/actions/${exampleAction.key}/substeps`;
+
+    const response = await request(app)
+      .get(endpointUrl)
+      .set('Authorization', token)
+      .expect(200);
+
+    const expectedPayload = getActionSubstepsMock(exampleAction.substeps);
+    expect(response.body).toEqual(expectedPayload);
+  });
+
+  it('should return not found response for invalid app key', async () => {
+    await request(app)
+      .get('/api/v1/apps/invalid-app-key/actions/invalid-actions-key/substeps')
+      .set('Authorization', token)
+      .expect(404);
+  });
+
+  it('should return empty array for invalid action key', async () => {
+    const endpointUrl = `/api/v1/apps/${exampleApp.key}/actions/invalid-action-key/substeps`;
+
+    const response = await request(app)
+      .get(endpointUrl)
+      .set('Authorization', token)
+      .expect(200);
+
+    expect(response.body.data).toEqual([]);
+  });
+});
diff --git a/packages/backend/src/routes/api/v1/apps.js b/packages/backend/src/routes/api/v1/apps.js
index 399cd71c..0167032e 100644
--- a/packages/backend/src/routes/api/v1/apps.js
+++ b/packages/backend/src/routes/api/v1/apps.js
@@ -7,6 +7,7 @@ import getAuthAction from '../../../controllers/api/v1/apps/get-auth.js';
 import getTriggersAction from '../../../controllers/api/v1/apps/get-triggers.js';
 import getTriggerSubstepsAction from '../../../controllers/api/v1/apps/get-trigger-substeps.js';
 import getActionsAction from '../../../controllers/api/v1/apps/get-actions.js';
+import getActionSubstepsAction from '../../../controllers/api/v1/apps/get-action-substeps.js';
 
 const router = Router();
 
@@ -32,4 +33,10 @@ router.get(
   asyncHandler(getActionsAction)
 );
 
+router.get(
+  '/:appKey/actions/:actionKey/substeps',
+  authenticateUser,
+  asyncHandler(getActionSubstepsAction)
+);
+
 export default router;
diff --git a/packages/backend/test/mocks/rest/api/v1/apps/get-action-substeps.js b/packages/backend/test/mocks/rest/api/v1/apps/get-action-substeps.js
new file mode 100644
index 00000000..29c5f5be
--- /dev/null
+++ b/packages/backend/test/mocks/rest/api/v1/apps/get-action-substeps.js
@@ -0,0 +1,14 @@
+const getActionSubstepsMock = (substeps) => {
+  return {
+    data: substeps,
+    meta: {
+      count: substeps.length,
+      currentPage: null,
+      isArray: true,
+      totalPages: null,
+      type: 'Object',
+    },
+  };
+};
+
+export default getActionSubstepsMock;