diff --git a/lib/api/routes/health.js b/lib/api/routes/health.js
index 2462728..4fe5aa0 100644
--- a/lib/api/routes/health.js
+++ b/lib/api/routes/health.js
@@ -17,7 +17,7 @@ router.get('/services', asyncWrap(async (_req, res) => {
     const list = g.services.map(s => {
       const st = statuses[s.id];
       return {
-        id: s.id, name: s.name, host: s.host, url: s.url, icon: iconSlug(s),
+        id: s.id, name: s.name, host: s.host, url: s.url, external: s.external ?? null, icon: iconSlug(s),
         status: st?.status || 'unknown', latency_ms: st?.latency_ms ?? null,
         detail: st?.detail || null, checked_at: st?.checked_at || null
       };
@@ -39,6 +39,7 @@ const svcBody = z.object({
   category: z.enum(['agents', 'infrastructure', 'media', 'other']).default('other'),
   host: z.string().max(120).optional(),
   url: z.string().url(),
+  external: z.string().url().optional(),
   icon: z.string().max(64).optional(),
   check: checkCfg.optional()
 });
diff --git a/tests/api/health.test.js b/tests/api/health.test.js
index 325a185..30ab4f0 100644
--- a/tests/api/health.test.js
+++ b/tests/api/health.test.js
@@ -28,6 +28,18 @@ describe('health api (DB-backed registry)', () => {
     expect(infra.services.find(s => s.id === 'gitea').status).toBe('ok');
   });
 
+  it('GET /services includes external on every tile; POST round-trips it', async () => {
+    const res = await request(app).get('/api/health/services').set(ownerHeaders);
+    const all = res.body.flatMap(g => g.services);
+    expect(all.every(s => 'external' in s)).toBe(true);                 // key present (may be null)
+    expect(all.find(s => s.id === 'gitea').external).toBeNull();        // no domain set
+    await request(app).post('/api/health/services').set(ownerHeaders)
+      .send({ id: 'gramps', name: 'Gramps', category: 'infrastructure', url: 'http://192.168.1.99', external: 'https://gramps.hynesy.com' });
+    const res2 = await request(app).get('/api/health/services').set(ownerHeaders);
+    const gramps = res2.body.flatMap(g => g.services).find(s => s.id === 'gramps');
+    expect(gramps.external).toBe('https://gramps.hynesy.com');
+  });
+
   it('POST /services adds a service that shows up in the band', async () => {
     const create = await request(app).post('/api/health/services').set(ownerHeaders)
       .send({ id: 'ollama', name: 'Ollama', category: 'agents', host: 'ct102', url: 'http://192.168.1.185:11434' });