diff --git a/apps/econ/src/econ.app.ts b/apps/econ/src/econ.app.ts
index 4bbf5ab..840eed3 100644
--- a/apps/econ/src/econ.app.ts
+++ b/apps/econ/src/econ.app.ts
@@ -69,6 +69,8 @@ import {
 	SaveOutfitV4Response,
 	SubscriptionResponse,
 	UNAUTHORIZED_RESPONSE,
+	UpdateObjectiveRequest,
+	UpdateObjectiveResponse,
 } from './openapi'
 import { getOutfits, setOutfit } from './outfit-db'
 
@@ -500,6 +502,37 @@ const app = new Hono<App>({ strict: false })
 		(c) => c.json([])
 	)
 
+	// Report one objective's progress. The client posts the whole objective as it now
+	// sees it (Index/Group identify it within `myprogress`) and reads back the state of
+	// the GROUP that objective belongs to — camelCase here, unlike the PascalCase body it
+	// posted. Stubbed: with no objectives store yet we persist nothing, echo the group
+	// back and never complete it, so the reward-claim flow isn't triggered. `clearedAt`
+	// is the clear time, which for a group we didn't clear is just now.
+	.post(
+		'/api/objectives/v1/updateobjective',
+		describeRoute({
+			tags: ['Econ'],
+			summary: 'Report objective progress',
+			description: [
+				'Stubbed: with no objectives store we persist nothing and never complete a group.',
+				'Echoes `Group` back as camelCase `group` with `isCompleted: false` so the client',
+				'gets a well-formed body.',
+			].join(' '),
+			requestBody: jsonBody(UpdateObjectiveRequest, 'The objective as the client now sees it'),
+			responses: { 200: json(UpdateObjectiveResponse, 'The echoed group, never completed') },
+		}),
+		async (c) => {
+			const body = await c.req
+				.json<{ Group?: string | number }>()
+				.catch(() => ({}) as Record<string, never>)
+			return c.json({
+				group: Number(body.Group) || 0,
+				isCompleted: false,
+				clearedAt: new Date().toISOString(),
+			})
+		}
+	)
+
 	// The player's avatar, stored as a JSON blob on their account row. Falls back
 	// to the default outfit when they haven't saved one — the client's parser NREs
 	// on an empty OutfitSelections (real RecNet never returns one).
diff --git a/apps/econ/src/openapi.ts b/apps/econ/src/openapi.ts
index 8fa7c1a..cd8a5bc 100644
--- a/apps/econ/src/openapi.ts
+++ b/apps/econ/src/openapi.ts
@@ -112,6 +112,17 @@ export const ChallengeProgressResponse = z.object({
 	Complete: z.boolean().describe('Always false — no challenge-progress store yet'),
 })
 
+/**
+ * `POST /api/objectives/v1/updateobjective` — the group the objective belongs to, after
+ * the update. camelCase, unlike the PascalCase body the client posts and the PascalCase
+ * `ObjectiveGroups` entries `myprogress` serves — three spellings of the same group.
+ */
+export const UpdateObjectiveResponse = z.object({
+	group: z.int().describe('Echoed back from the request'),
+	isCompleted: z.boolean().describe('Always false — no objectives store yet'),
+	clearedAt: z.string().describe('When the group was cleared — now, since nothing persists'),
+})
+
 /**
  * `POST /api/storefronts/v2/buyItem` — the purchase result. `Balance` is the CHANGE
  * applied (the negated price), not the resulting total; the client reads its new total
@@ -198,6 +209,20 @@ export const ChallengeProgressRequest = z.object({
 	Config: z.string().optional().describe('The client-evaluated rule tree'),
 })
 
+/**
+ * `POST /api/objectives/v1/updateobjective` JSON body — one objective's state as the
+ * client now sees it. `Index`/`Group` identify it within `myprogress`; the rest is the
+ * progress it wants persisted.
+ */
+export const UpdateObjectiveRequest = z.object({
+	Index: z.int().describe('Which objective within the group'),
+	Group: z.int().describe('Which objective group'),
+	Progress: z.int().optional(),
+	VisualProgress: z.int().optional().describe('What the client animates towards'),
+	IsCompleted: z.boolean().optional(),
+	HasClaimedReward: z.boolean().optional(),
+})
+
 /** `POST /api/avatar/v3/saved/set` JSON body — an outfit with a target `Slot`. */
 export const SaveOutfitRequest = z
 	.object({ Slot: z.int().describe('Which slot to overwrite; a non-integer is 400') })
diff --git a/apps/econ/src/test/integration/api.test.ts b/apps/econ/src/test/integration/api.test.ts
index 71fc0c0..f694b3c 100644
--- a/apps/econ/src/test/integration/api.test.ts
+++ b/apps/econ/src/test/integration/api.test.ts
@@ -342,6 +342,37 @@ describe('econ endpoints', () => {
 		}
 	})
 
+	test('POST /api/objectives/v1/updateobjective echoes the group, never completed', async () => {
+		const res = await exports.default.fetch(`${ORIGIN}/api/objectives/v1/updateobjective`, {
+			method: 'POST',
+			headers: { 'content-type': 'application/json' },
+			body: JSON.stringify({
+				Index: 2,
+				Group: 3,
+				Progress: 1,
+				VisualProgress: 0,
+				IsCompleted: true,
+				HasClaimedReward: false,
+			}),
+		})
+		expect(res.status).toBe(200)
+		const body = (await res.json()) as { group: number; isCompleted: boolean; clearedAt: string }
+		expect(body.group).toBe(3)
+		expect(body.isCompleted).toBe(false)
+		expect(Number.isNaN(Date.parse(body.clearedAt))).toBe(false)
+	})
+
+	test('POST /api/objectives/v1/updateobjective tolerates a non-JSON body', async () => {
+		const res = await exports.default.fetch(`${ORIGIN}/api/objectives/v1/updateobjective`, {
+			method: 'POST',
+			body: 'not json',
+		})
+		expect(res.status).toBe(200)
+		const body = (await res.json()) as { group: number; isCompleted: boolean }
+		expect(body.group).toBe(0)
+		expect(body.isCompleted).toBe(false)
+	})
+
 	test('GET /api/checklist/v1/current 401s without a token, returns [] with one', async () => {
 		const anon = await exports.default.fetch(`${ORIGIN}/api/checklist/v1/current`)
 		expect(anon.status).toBe(401)
@@ -1425,6 +1456,7 @@ describe('econ endpoints', () => {
 			'POST /api/consumables/v1/consume',
 			'POST /api/gamerewards/v1/request',
 			'POST /api/objectives/v1/cleargroup',
+			'POST /api/objectives/v1/updateobjective',
 			'POST /api/storefronts/v2/buyItem',
 			'PUT /api/equipment/v1/update',
 		])