diff --git a/.changeset/30762-cloud-binding-service-name.md b/.changeset/30762-cloud-binding-service-name.md
new file mode 100644
index 00000000000..506ad4b780a
--- /dev/null
+++ b/.changeset/30762-cloud-binding-service-name.md
@@ -0,0 +1,20 @@
+---
+'@objectstack/spec': patch
+'@objectstack/cloud-connection': patch
+'@objectstack/service-push': patch
+---
+
+fix(cloud-connection): name the `cloud-binding` service once, in its contract, and read an empty `controlPlaneUrl` one way
+
+Clause-②: yes (widening)
+Metadata-protocol: none
+
+`@objectstack/spec/contracts` now exports `CLOUD_BINDING_SERVICE` (`'cloud-binding'`) beside `ICloudBindingService`, the way the sibling contracts export their service names. `@objectstack/cloud-connection` registers the binding under it and `@objectstack/service-push`'s relay sender reads it, so the registrar and the reader can no longer spell the name two ways. `@objectstack/service-push` keeps exporting `CLOUD_BINDING_SERVICE`, now a re-export of the contract's constant with the same value.
+
+`CloudConnectionPlugin`'s routes now take their control-plane URL from the `cloud-binding` service they register, so the routes and the binding read the `controlPlaneUrl` option the same way:
+
+- An explicit empty (or blank) `controlPlaneUrl` means "cloud not configured" for both: the routes answer `CLOUD_UNCONFIGURED` as before, and `controlPlaneUrl()` now answers `''` instead of the production default.
+- A declined `OS_CLOUD_URL` (`off`, `none`, `local`, `disabled`) under an absent option is "cloud not configured" for the routes too, as it already was for the binding.
+- An absent option falls through to `OS_CLOUD_URL`, then the ObjectStack-operated default, for the routes too, as it already did for the binding and for the marketplace plugins.
+
+`objectstack serve` and the showcase app are unchanged: they compose the plugin only with `resolveCloudUrl()`'s non-empty answer, which both readings return as is.
diff --git a/packages/cloud-connection/src/cloud-binding.test.ts b/packages/cloud-connection/src/cloud-binding.test.ts
index d6ba71ede76..14df7419eed 100644
--- a/packages/cloud-connection/src/cloud-binding.test.ts
+++ b/packages/cloud-connection/src/cloud-binding.test.ts
@@ -11,8 +11,8 @@ import { mkdtempSync, rmSync } from 'node:fs';
 import { tmpdir } from 'node:os';
 import { join } from 'node:path';
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
-import type { ICloudBindingService } from '@objectstack/spec/contracts';
-import { CLOUD_BINDING_SERVICE, createCloudBinding } from './cloud-binding.js';
+import { CLOUD_BINDING_SERVICE, type ICloudBindingService } from '@objectstack/spec/contracts';
+import { createCloudBinding } from './cloud-binding.js';
 import { CloudConnectionPlugin } from './cloud-connection-plugin.js';
 import { ConnectionCredentialStore } from './connection-credential-store.js';
 import { DEFAULT_CLOUD_URL } from './cloud-url.js';
@@ -70,9 +70,22 @@ describe('createCloudBinding — the control-plane URL', () => {
         vi.stubEnv('OS_CLOUD_URL', 'off');
         expect(createCloudBinding({ store }).controlPlaneUrl()).toBe('');
     });
+
+    // [#30762] An explicit empty option is the host saying "no control plane",
+    // the reading the plugin's routes always gave it. It does not fall through
+    // to OS_CLOUD_URL or the default the way an absent option does.
+    it.each(['', '   '])('is empty for an explicit empty option %j, over OS_CLOUD_URL and the default', (option) => {
+        expect(createCloudBinding({ store, controlPlaneUrl: option }).controlPlaneUrl()).toBe('');
+        vi.stubEnv('OS_CLOUD_URL', 'https://env.example.com');
+        expect(createCloudBinding({ store, controlPlaneUrl: option }).controlPlaneUrl()).toBe('');
+    });
 });
 
 describe('CloudConnectionPlugin — registers the binding in init()', () => {
+    it('registers it under the name the contract exports, the one service-push reads', () => {
+        expect(CLOUD_BINDING_SERVICE).toBe('cloud-binding');
+    });
+
     it('registers cloud-binding, declared in providesServices, reading the plugin\'s own credential store', async () => {
         const services = new Map<string, unknown>();
         const plugin = new CloudConnectionPlugin({ credentialPath: join(dir, 'cloud-connection.json'), controlPlaneUrl: 'https://cp.example.com' });
diff --git a/packages/cloud-connection/src/cloud-binding.ts b/packages/cloud-connection/src/cloud-binding.ts
index 918402fc12a..653f54d3576 100644
--- a/packages/cloud-connection/src/cloud-binding.ts
+++ b/packages/cloud-connection/src/cloud-binding.ts
@@ -19,13 +19,14 @@ import type { ICloudBindingService } from '@objectstack/spec/contracts';
 import { resolveCloudUrl } from './cloud-url.js';
 import type { ConnectionCredentialStore } from './connection-credential-store.js';
 
-/** The kernel service name {@link createCloudBinding}'s answer is registered under. */
-export const CLOUD_BINDING_SERVICE = 'cloud-binding';
-
 export interface CloudBindingOptions {
     /** The plugin's `controlPlaneApiKey` option (the env→cloud service key); `OS_CLOUD_API_KEY` when absent. */
     controlPlaneApiKey?: string;
-    /** The plugin's `controlPlaneUrl` option; `OS_CLOUD_URL`, then the default, when absent. */
+    /**
+     * The plugin's `controlPlaneUrl` option; `OS_CLOUD_URL`, then the default,
+     * when absent. An explicit empty (or blank) value declares that this
+     * server has no control plane, the same as a decline spelling.
+     */
     controlPlaneUrl?: string;
     /** Where a self-hosted bind persisted its `oscc_` bearer. */
     store: Pick<ConnectionCredentialStore, 'read'>;
@@ -40,6 +41,13 @@ export interface CloudBindingOptions {
  * derivation `isCloudManaged` reads in `@objectstack/core`
  * (`resolveControlPlaneApiKey`), so "platform-managed" and "which bearer"
  * cannot disagree.
+ *
+ * The control-plane URL is {@link resolveCloudUrl}'s answer, with one
+ * exception: an explicit empty option answers `''`, "no control plane".
+ * `resolveCloudUrl` reads that `''` as unset and falls through to the
+ * environment and the default, while this plugin's own routes read it as
+ * "cloud not configured". The routes read their URL through this member, so
+ * the binding and the routes give the one option one reading.
  */
 export function createCloudBinding(options: CloudBindingOptions): ICloudBindingService {
     const credential = (): string =>
@@ -47,6 +55,12 @@ export function createCloudBinding(options: CloudBindingOptions): ICloudBindingS
     return {
         credential,
         bound: () => credential() !== '',
-        controlPlaneUrl: () => resolveCloudUrl(options.controlPlaneUrl),
+        controlPlaneUrl: () => resolveBindingUrl(options.controlPlaneUrl),
     };
 }
+
+/** {@link resolveCloudUrl}, except that an explicit empty (or blank) option answers `''`. */
+function resolveBindingUrl(explicit: string | undefined): string {
+    if (typeof explicit === 'string' && explicit.trim() === '') return '';
+    return resolveCloudUrl(explicit);
+}
diff --git a/packages/cloud-connection/src/cloud-connection-plugin.test.ts b/packages/cloud-connection/src/cloud-connection-plugin.test.ts
index 53716e3e333..23cc59b21c5 100644
--- a/packages/cloud-connection/src/cloud-connection-plugin.test.ts
+++ b/packages/cloud-connection/src/cloud-connection-plugin.test.ts
@@ -10,6 +10,7 @@
  */
 
 import { describe, expect, it, vi, beforeEach, afterEach } from 'vitest';
+import { CLOUD_BINDING_SERVICE, type ICloudBindingService } from '@objectstack/spec/contracts';
 import { CloudConnectionPlugin, createCloudConnectionPlugin } from './cloud-connection-plugin.js';
 import { bindCatalogFromTables } from './__tests__/security-catalog.testkit.js';
 
@@ -268,3 +269,64 @@ describe('single-environment mode (host auth, fixed env id)', () => {
         expect(res.payload.data.environmentId).toBe('env-from-env-var');
     });
 });
+
+/**
+ * [#30762] One reading of the control-plane URL. The routes read it through
+ * the `cloud-binding` service the plugin registers, the same answer the push
+ * relay sender reads, so the two cannot disagree on an option. An explicit
+ * empty option is "cloud not configured" for both, and does not fall through
+ * to `OS_CLOUD_URL` or the default.
+ */
+describe('CloudConnectionPlugin — the routes and the binding read the control-plane URL once', () => {
+    const ENV = 'env-123';
+    const services = {
+        'env-registry': { resolveByHostname: async () => ({ environmentId: ENV }) },
+        'kernel-manager': { getOrCreate: async () => ({ getServiceAsync: async () => sessionAuth('user-1') }) },
+    };
+
+    afterEach(() => { vi.unstubAllEnvs(); });
+
+    /** Boot the plugin, drive `GET /installed` once, and answer where it went and what the binding says. */
+    async function readBoth(controlPlaneUrl: string | undefined) {
+        const rawApp = makeRawApp();
+        const { ctx, fireKernelReady } = makeCtx({ rawApp, services });
+        const registered = new Map<string, unknown>();
+        const fetchSpy = vi.fn(async (_url: string) => new Response(JSON.stringify({ success: true, data: { packages: [], total: 0 } }), { status: 200 }));
+        vi.stubGlobal('fetch', fetchSpy);
+        const plugin = new CloudConnectionPlugin({ controlPlaneApiKey: 'svc-key', ...(controlPlaneUrl === undefined ? {} : { controlPlaneUrl }) });
+        await plugin.init({ ...ctx, registerService: (name: string, svc: unknown) => registered.set(name, svc) } as any);
+        await plugin.start(ctx as any);
+        await fireKernelReady();
+        const res = await rawApp.routes.get('GET /api/v1/cloud-connection/installed')!(
+            makeC('https://t1.example.com/api/v1/cloud-connection/installed'),
+        );
+        const binding = registered.get(CLOUD_BINDING_SERVICE) as ICloudBindingService;
+        const called = fetchSpy.mock.calls.map(([url]) => String(url));
+        return { res, binding: binding.controlPlaneUrl(), called };
+    }
+
+    it.each(['', '   '])('an explicit empty option %j is "cloud not configured" for both, over OS_CLOUD_URL', async (option) => {
+        vi.stubEnv('OS_CLOUD_URL', 'https://env.example.com');
+        const { res, binding, called } = await readBoth(option);
+        expect(binding).toBe('');
+        expect(called).toEqual([]);
+        expect(res.payload).toEqual({ success: true, data: { packages: [], total: 0, connected: false } });
+    });
+
+    it('a declined OS_CLOUD_URL under an absent option is "cloud not configured" for both', async () => {
+        vi.stubEnv('OS_CLOUD_URL', 'off');
+        const { binding, called } = await readBoth(undefined);
+        expect(binding).toBe('');
+        expect(called).toEqual([]);
+    });
+
+    it.each([
+        ['the configured URL', 'https://cp.example.com/', 'https://env.example.com', 'https://cp.example.com'],
+        ['OS_CLOUD_URL under an absent option', undefined, 'https://env.example.com/', 'https://env.example.com'],
+    ])('%s: the routes call the URL the binding answers', async (_label, option, env, expected) => {
+        vi.stubEnv('OS_CLOUD_URL', env);
+        const { binding, called } = await readBoth(option);
+        expect(binding).toBe(expected);
+        expect(called).toEqual([`${expected}/api/v1/cloud/environments/${ENV}/packages`]);
+    });
+});
diff --git a/packages/cloud-connection/src/cloud-connection-plugin.ts b/packages/cloud-connection/src/cloud-connection-plugin.ts
index 8fcd5d514ed..a955339a953 100644
--- a/packages/cloud-connection/src/cloud-connection-plugin.ts
+++ b/packages/cloud-connection/src/cloud-connection-plugin.ts
@@ -149,8 +149,8 @@ import {
 import type { AuthSessionApi, IAuthService, IObjectQLEngine } from '@objectstack/spec/contracts';
 import { inProcessSessionReadInput } from '@objectstack/types';
 import { ConnectionCredentialStore } from './connection-credential-store.js';
-import { CLOUD_BINDING_SERVICE, createCloudBinding } from './cloud-binding.js';
-import type { ICloudBindingService } from '@objectstack/spec/contracts';
+import { createCloudBinding } from './cloud-binding.js';
+import { CLOUD_BINDING_SERVICE, type ICloudBindingService } from '@objectstack/spec/contracts';
 import { CLOUD_CONNECTION_CAPABILITY, CLOUD_CONNECTION_UI_BUNDLE } from './cloud-connection-ui.js';
 import { readJsonRequestBody } from './request-json-body.js';
 
@@ -266,7 +266,13 @@ interface ResolvedSession {
 const ENVIRONMENT_NOT_FOUND_MESSAGE = 'Could not resolve an environment for this request host.';
 
 export interface CloudConnectionPluginConfig {
-    /** Control-plane base URL. Default: `OS_CLOUD_URL` (read lazily at kernel:ready). */
+    /**
+     * Control-plane base URL. Default: `OS_CLOUD_URL` (read lazily at
+     * kernel:ready), then the ObjectStack-operated default. An explicit `''`,
+     * or a decline spelling (`off`, `none`, `local`, `disabled`), means "cloud
+     * not configured": the routes answer `CLOUD_UNCONFIGURED` and the
+     * `cloud-binding` service's `controlPlaneUrl()` answers `''`.
+     */
     controlPlaneUrl?: string;
     /** env→cloud service credential. Default: `OS_CLOUD_API_KEY`. */
     controlPlaneApiKey?: string;
@@ -333,8 +339,12 @@ export class CloudConnectionPlugin implements Plugin {
             const rawApp = httpServer.getRawApp();
             // Env vars are read here (not at construction) so a host can set
             // them between config load and kernel boot — preserves the
-            // behavior of the original app-level wiring.
-            const cloudUrl = (this.cfg.controlPlaneUrl ?? process.env.OS_CLOUD_URL ?? '').trim().replace(/\/+$/, '');
+            // behavior of the original app-level wiring. [#30762] The URL is
+            // the `cloud-binding` service's answer, the one the push relay
+            // sender reads too: an explicit empty option means "cloud not
+            // configured" for both, and an absent one falls through to
+            // `OS_CLOUD_URL`, then the default, as `resolveCloudUrl` does.
+            const cloudUrl = this.binding.controlPlaneUrl();
             const cloudApiKey = resolveControlPlaneApiKey(this.cfg.controlPlaneApiKey);
             const deviceClientId = (this.cfg.deviceClientId ?? process.env.OS_CLI_CLIENT_ID ?? 'objectstack-cli').trim();
             const deviceScope = 'openid profile email';
diff --git a/packages/services/service-push/src/push-plugin.test.ts b/packages/services/service-push/src/push-plugin.test.ts
index c10ef7e428c..db10034bc59 100644
--- a/packages/services/service-push/src/push-plugin.test.ts
+++ b/packages/services/service-push/src/push-plugin.test.ts
@@ -6,7 +6,7 @@
  */
 
 import { afterEach, beforeEach, describe, it, expect, vi } from 'vitest';
-import type { ICloudBindingService } from '@objectstack/spec/contracts';
+import { CLOUD_BINDING_SERVICE, type ICloudBindingService } from '@objectstack/spec/contracts';
 import { PushServicePlugin, PUSH_RELAY_AIR_GAPPED_MESSAGE } from './push-plugin.js';
 import { PushService, type IPushTransport, type PushMessage } from './push-service.js';
 import { envPushCredentialResolver } from './credential.js';
@@ -98,7 +98,7 @@ describe('PushServicePlugin — the hosted relay', () => {
 
     it('bound: lists both vendors and sends one POST carrying the binding credential, which no log line carries', async () => {
         const { ctx, services, lines, fire } = context();
-        services.set('cloud-binding', cloudBinding(() => SECRET));
+        services.set(CLOUD_BINDING_SERVICE, cloudBinding(() => SECRET));
         const calls: Array<{ url: string; headers: Record<string, string> }> = [];
         const relayFetch = (async (url: string, init: RequestInit) => {
             calls.push({ url, headers: init.headers as Record<string, string> });
@@ -122,7 +122,7 @@ describe('PushServicePlugin — the hosted relay', () => {
     it('unbound at kernel:ready: warns once, and the bind takes effect without a restart', async () => {
         const { ctx, services, lines, fire } = context();
         let credential = '';
-        services.set('cloud-binding', cloudBinding(() => credential));
+        services.set(CLOUD_BINDING_SERVICE, cloudBinding(() => credential));
         const plugin = new PushServicePlugin({ config: {} });
         await plugin.init(ctx);
         await plugin.start(ctx);
diff --git a/packages/services/service-push/src/transports/relay.ts b/packages/services/service-push/src/transports/relay.ts
index e8864ce45fb..0287acf9860 100644
--- a/packages/services/service-push/src/transports/relay.ts
+++ b/packages/services/service-push/src/transports/relay.ts
@@ -7,7 +7,7 @@ import {
     type PushRelayPayload,
     type PushRelayRequest,
 } from '@objectstack/spec/api';
-import type { ICloudBindingService } from '@objectstack/spec/contracts';
+import { CLOUD_BINDING_SERVICE, type ICloudBindingService } from '@objectstack/spec/contracts';
 import type { PushRelayTransportConfigParsed, PushVendor } from '@objectstack/spec/system';
 import type { IPushTransport, PushMessage, PushSendResult } from '../push-service.js';
 
@@ -22,8 +22,13 @@ import type { IPushTransport, PushMessage, PushSendResult } from '../push-servic
  */
 export const PUSH_RELAY_PATH = '/api/v1/cloud/push/send';
 
-/** The kernel service the binding credential is read from (`ICloudBindingService`, `@objectstack/cloud-connection`). */
-export const CLOUD_BINDING_SERVICE = 'cloud-binding';
+/**
+ * The kernel service the binding credential is read from (`ICloudBindingService`,
+ * registered by `@objectstack/cloud-connection`). The name lives beside the
+ * contract in `@objectstack/spec/contracts`; re-exported here so this
+ * package's existing public export keeps its spelling and its value.
+ */
+export { CLOUD_BINDING_SERVICE };
 
 /**
  * The visible line a relay delivery shows when the caller names none: the
diff --git a/packages/services/service-push/vitest.config.ts b/packages/services/service-push/vitest.config.ts
index 89ca038fe8c..fd7a9ad4751 100644
--- a/packages/services/service-push/vitest.config.ts
+++ b/packages/services/service-push/vitest.config.ts
@@ -24,6 +24,10 @@ export default defineConfig({
       // from `@objectstack/core`: both from source, for the same reason.
       { find: /^@objectstack\/spec\/api$/, replacement: path.resolve(__dirname, '../../spec/src/api/index.ts') },
       { find: /^@objectstack\/core$/, replacement: path.resolve(__dirname, '../../core/src/index.ts') },
+      // The relay sender reads the `cloud-binding` service name from the
+      // contract (`CLOUD_BINDING_SERVICE`, `@objectstack/spec/contracts`): from
+      // source, for the same reason.
+      { find: /^@objectstack\/spec\/contracts$/, replacement: path.resolve(__dirname, '../../spec/src/contracts/index.ts') },
     ],
   },
 });
diff --git a/packages/spec/api-surface/contracts.json b/packages/spec/api-surface/contracts.json
index 705bfd732df..923ee5c020a 100644
--- a/packages/spec/api-surface/contracts.json
+++ b/packages/spec/api-surface/contracts.json
@@ -58,6 +58,7 @@
     "AuthoredRowWriteVerdict (type)",
     "AutomationContext (interface)",
     "AutomationResult (interface)",
+    "CLOUD_BINDING_SERVICE (const)",
     "CRYPTO_CONTEXT_SCOPES (const)",
     "CacheStats (interface)",
     "ChatWithToolsOptions (interface)",
diff --git a/packages/spec/export-origins/contracts.json b/packages/spec/export-origins/contracts.json
index e9d1ae8ed9d..e02bbb4de6f 100644
--- a/packages/spec/export-origins/contracts.json
+++ b/packages/spec/export-origins/contracts.json
@@ -58,6 +58,7 @@
     "AuthoredRowWriteVerdict": "src/contracts/security-service.ts#AuthoredRowWriteVerdict (type)",
     "AutomationContext": "src/contracts/automation-service.ts#AutomationContext (interface)",
     "AutomationResult": "src/contracts/automation-service.ts#AutomationResult (interface)",
+    "CLOUD_BINDING_SERVICE": "src/contracts/cloud-binding-service.ts#CLOUD_BINDING_SERVICE (const)",
     "CRYPTO_CONTEXT_SCOPES": "src/contracts/crypto-provider.ts#CRYPTO_CONTEXT_SCOPES (const)",
     "CacheStats": "src/contracts/cache-service.ts#CacheStats (interface)",
     "ChatWithToolsOptions": "src/contracts/ai-service.ts#ChatWithToolsOptions (interface)",
diff --git a/packages/spec/src/contracts/cloud-binding-service.ts b/packages/spec/src/contracts/cloud-binding-service.ts
index 401c87bb668..9b7882a7325 100644
--- a/packages/spec/src/contracts/cloud-binding-service.ts
+++ b/packages/spec/src/contracts/cloud-binding-service.ts
@@ -39,7 +39,16 @@ export interface ICloudBindingService {
    * The control-plane base URL the binding is made against, without a
    * trailing slash: the configured value, else `OS_CLOUD_URL`, else the
    * ObjectStack-operated default. `''` when the deployment declared that it
-   * has no control plane (`OS_CLOUD_URL=off`, `none`, `local`, `disabled`).
+   * has no control plane (`OS_CLOUD_URL=off`, `none`, `local`, `disabled`,
+   * or an explicitly empty or blank configured value).
    */
   controlPlaneUrl(): string;
 }
+
+/**
+ * Service-registry slot for {@link ICloudBindingService}: the one spelling of
+ * the name. `@objectstack/cloud-connection` registers the binding under it and
+ * a reader (`@objectstack/service-push`'s relay sender) asks for it, so the
+ * registrar and the reader cannot drift apart.
+ */
+export const CLOUD_BINDING_SERVICE = 'cloud-binding';