diff --git a/README.md b/README.md
index dd05ab66d..2cd6773f6 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ before making a package-level licence statement.
 [![Latest release](https://img.shields.io/github/v/release/Posnic/POS?include_prereleases&label=latest&color=blue)](https://github.com/Posnic/POS/releases/latest)
 [![Tests](https://img.shields.io/badge/tests-9%2C000%2B%20passing-brightgreen)](docs/DEVELOPMENT.md#running-the-tests)
 [![Coverage](https://img.shields.io/badge/coverage-69%25%20statements-yellow)](docs/DEVELOPMENT.md#running-the-tests)
-[![API](https://img.shields.io/badge/REST%20API-894%20endpoints-blue)](docs/API.md)
+[![API](https://img.shields.io/badge/REST%20API-895%20endpoints-blue)](docs/API.md)
 [![Source licence](https://img.shields.io/badge/source%20licence-AGPL--3.0-blue)](LICENSE)
 [![Package notices](https://img.shields.io/badge/package%20notices-component%20licences-informational)](THIRD-PARTY-NOTICES.md)
 [![Platforms](https://img.shields.io/badge/platforms-Windows%20%7C%20macOS%20%7C%20Linux-lightgrey)](https://github.com/Posnic/POS/releases/latest)
@@ -235,7 +235,7 @@ the free edition worse. This is written down in [GOVERNANCE.md](docs/GOVERNANCE.
 | [Contributor quickstart](docs/CONTRIBUTOR_QUICKSTART.md) | Local setup, test commands, issue map, PR flow and safety rules |
 | [Developer guide](docs/DEVELOPMENT.md) | Setup, tests, conventions, good first issues |
 | [Architecture](docs/ARCHITECTURE.md) | How it fits together, and the parts that bite |
-| [REST API](docs/API.md) | 894 endpoints, generated from the routes |
+| [REST API](docs/API.md) | 895 endpoints, generated from the routes |
 | [Hardware](docs/HARDWARE_MATRIX.md) | Printers, scanners, drawers, scales — and how far each claim is checked |
 | [India e-invoicing](docs/INDIA_EINVOICING_DESIGN.md) | Research, readiness inventory and design for GST e-invoicing as an optional feature; no live IRP submission is built |
 | [India GST return gaps](docs/INDIA_GST_RETURNS_GAPS.md) | What the GST reports compute today, measured against GSTR-1, 3B and 9 |
diff --git a/api/src/routes/mobile-pos.routes.js b/api/src/routes/mobile-pos.routes.js
index d0dca1901..a3a15ba92 100644
--- a/api/src/routes/mobile-pos.routes.js
+++ b/api/src/routes/mobile-pos.routes.js
@@ -28,6 +28,29 @@ const limiter = rateLimit({
   legacyHeaders: false,
 });
 
+// Discovery exposes only public display names, never branch/staff identifiers.
+router.get(
+  '/discovery',
+  rateLimit({ windowMs: 60000, limit: 60 }),
+  wrap(async (req) => {
+    const rows = await req.db
+      .collection('branches')
+      .find(
+        { module_mobile_pos_enable: { $nin: [false, 0, '0', 'false'] } },
+        { projection: { _id: 0, branch_name: 1 } }
+      )
+      .limit(10)
+      .toArray();
+    return {
+      shopName: [
+        ...new Set(rows.map((row) => String(row.branch_name || '').trim()).filter(Boolean)),
+      ]
+        .join(' · ')
+        .slice(0, 160),
+    };
+  })
+);
+
 router.post(
   '/enrolment-proof',
   rateLimit({ windowMs: 60000, limit: 120, standardHeaders: true, legacyHeaders: false }),
diff --git a/api/tests/api/rest-smoke.test.js b/api/tests/api/rest-smoke.test.js
index 1d61e2025..5d709a23a 100644
--- a/api/tests/api/rest-smoke.test.js
+++ b/api/tests/api/rest-smoke.test.js
@@ -168,7 +168,9 @@ describeIfDb('the REST API, against a real database', () => {
      * branch would not save. It cannot be caught with a mock: the constraint
      * lives in MongoDB, not in the code.
      */
-    const customers = client.db(DB_NAME).collection('customers');
+    // Keep this deliberate legacy-index fixture separate from startup migrations,
+    // which normalize blank emails in the real customers collection asynchronously.
+    const customers = client.db(DB_NAME).collection('customers_legacy_index_fixture');
     await customers.createIndex({ email: 1 }, { unique: true, sparse: true });
 
     await customers.insertOne({ name: 'First', phone: '' });
diff --git a/api/tests/mobile-pos.integration.cjs b/api/tests/mobile-pos.integration.cjs
index ccffa91d7..8364c6a1c 100644
--- a/api/tests/mobile-pos.integration.cjs
+++ b/api/tests/mobile-pos.integration.cjs
@@ -1304,3 +1304,9 @@ test('mobile snapshot sync carries disabled methods and still accepts a previous
     await db.collection('branches').replaceOne({ _id: branch._id }, savedBranch);
   }
 });
+
+test('public mobile discovery exposes a shop name without credentials or internal identifiers', async () => {
+  const result = await call('/mobile/v1/discovery', undefined, null);
+  assert.equal(result.status, 200);
+  assert.deepEqual(result.data, { shopName: branch.branch_name });
+});
diff --git a/docs/API.md b/docs/API.md
index 6ff9a51b0..c026ff575 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -3,7 +3,7 @@
 Generated from `api/src/routes/` by `npm run docs:api`. Do not edit this file
 by hand; edit the routes and regenerate.
 
-**894 endpoints across 53 route groups.**
+**895 endpoints across 53 route groups.**
 
 All paths below are relative to the API root. On a desktop install the API runs
 on a port derived per installation (see `local-ports.js`); in the cloud it sits
@@ -15,8 +15,8 @@ behind the tenant hostname.
 Postman, Insomnia or Bruno, point Swagger UI or Redoc at it, or generate a
 client from it. It is OpenAPI 3.0.3.
 
-**104 of 894 endpoints carry a request schema** (12%), recovered from
-their `express-validator` middleware. The remaining 790 are listed with
+**104 of 895 endpoints carry a request schema** (12%), recovered from
+their `express-validator` middleware. The remaining 791 are listed with
 path, method and handler but no body, because inventing a schema is worse than
 admitting the gap.
 
@@ -730,6 +730,7 @@ Mounted at `/mobile/v1`. Source: `api/src/routes/mobile-pos.routes.js`.
 
 | Method | Path | Body documented | Handler |
 |---|---|---|---|
+| GET | `/mobile/v1/discovery` | — | `Boolean` |
 | POST | `/mobile/v1/enrolment-proof` | — | `hex` |
 | POST | `/mobile/v1/pair` | — | `handsetLifetimeSeconds` |
 | GET | `/mobile/v1/inventory/policy` | — | `inventory.policy` |
diff --git a/docs/openapi.json b/docs/openapi.json
index 780ee3ed1..2d5099212 100644
--- a/docs/openapi.json
+++ b/docs/openapi.json
@@ -12953,6 +12953,29 @@
         "description": "Request body is not yet documented. This endpoint has no validation middleware, so its shape cannot be derived from the source. Adding validation improves both runtime safety and this document."
       }
     },
+    "/mobile/v1/discovery": {
+      "get": {
+        "summary": "Boolean",
+        "operationId": "get_mobile_v1_discovery",
+        "tags": [
+          "Mobile pos"
+        ],
+        "responses": {
+          "200": {
+            "description": "Success"
+          },
+          "400": {
+            "description": "Validation failed"
+          },
+          "401": {
+            "description": "Authentication required"
+          },
+          "500": {
+            "description": "Server error"
+          }
+        }
+      }
+    },
     "/mobile/v1/enrolment-proof": {
       "post": {
         "summary": "hex",
diff --git a/tests/public-routes.test.js b/tests/public-routes.test.js
index 64a38d672..57e70be8a 100644
--- a/tests/public-routes.test.js
+++ b/tests/public-routes.test.js
@@ -77,6 +77,9 @@ const ALLOWED_ANONYMOUS = {
     '/discovery',
   ],
   'mobile-pos.routes.js': [
+    // Rate-limited discovery exposes only bounded public shop display names.
+    // No identifiers, credentials or business data; pairing still proves access.
+    '/discovery',
     // Pairing is a rate-limited authentication entry point with an expiring,
     // one-use secret; cloud grants also require the approved phone and proof.
     // Discovery proof returns only a nonce MAC for an unexpired random grant,