diff --git a/addons/api/addon/adapters/host-catalog.js b/addons/api/addon/adapters/host-catalog.js
new file mode 100644
index 000000000..78c1d9a03
--- /dev/null
+++ b/addons/api/addon/adapters/host-catalog.js
@@ -0,0 +1,13 @@
+import ApplicationAdapter from './application';
+
+export default class HostCatalogAdapter extends ApplicationAdapter {
+
+  // =attributes
+
+  /**
+   * Host catalogs use the new, unprefixed pathing style.
+   * @override
+   */
+  hasScopePrefix = false;
+
+}
diff --git a/addons/api/addon/serializers/host-catalog.js b/addons/api/addon/serializers/host-catalog.js
new file mode 100644
index 000000000..766dff5d6
--- /dev/null
+++ b/addons/api/addon/serializers/host-catalog.js
@@ -0,0 +1,13 @@
+import ApplicationSerializer from './application';
+
+export default class HostCatalogSerializer extends ApplicationSerializer {
+
+  // =attributes
+
+  /**
+   * Serialized the scope ID into the `scope_id` field.
+   * @type {boolean}
+   */
+  serializeScopeID = true;
+
+}
diff --git a/addons/api/app/adapters/host-catalog.js b/addons/api/app/adapters/host-catalog.js
new file mode 100644
index 000000000..00197a624
--- /dev/null
+++ b/addons/api/app/adapters/host-catalog.js
@@ -0,0 +1 @@
+export { default } from 'api/adapters/host-catalog';
diff --git a/addons/api/app/serializers/host-catalog.js b/addons/api/app/serializers/host-catalog.js
new file mode 100644
index 000000000..e2818e2c7
--- /dev/null
+++ b/addons/api/app/serializers/host-catalog.js
@@ -0,0 +1 @@
+export { default } from 'api/serializers/host-catalog';
diff --git a/addons/api/tests/unit/adapters/host-catalog-test.js b/addons/api/tests/unit/adapters/host-catalog-test.js
new file mode 100644
index 000000000..02fba945c
--- /dev/null
+++ b/addons/api/tests/unit/adapters/host-catalog-test.js
@@ -0,0 +1,12 @@
+import { module, test } from 'qunit';
+import { setupTest } from 'ember-qunit';
+
+module('Unit | Adapter | host catalog', function(hooks) {
+  setupTest(hooks);
+
+  // Replace this with your real tests.
+  test('it exists', function(assert) {
+    let adapter = this.owner.lookup('adapter:host-catalog');
+    assert.ok(adapter);
+  });
+});
diff --git a/addons/api/tests/unit/adapters/host-set-test.js b/addons/api/tests/unit/adapters/host-set-test.js
index e47c7a7d6..9071a703a 100644
--- a/addons/api/tests/unit/adapters/host-set-test.js
+++ b/addons/api/tests/unit/adapters/host-set-test.js
@@ -22,7 +22,7 @@ module('Unit | Adapter | host set', function(hooks) {
     // With hostCatalogID...
     mockSnapshot.adapterOptions.hostCatalogID = hostCatalogID;
     url = adapter.buildURL('host-set', null, mockSnapshot, 'findAll');
-    assert.equal(url, '/v1/scopes/o_1/host-catalogs/hc_098/host-sets:my-custom-method');
+    assert.equal(url, '/v1/host-catalogs/hc_098/host-sets:my-custom-method');
   });
 
 });
diff --git a/addons/api/tests/unit/adapters/host-test.js b/addons/api/tests/unit/adapters/host-test.js
index 9e019284e..1e557ad26 100644
--- a/addons/api/tests/unit/adapters/host-test.js
+++ b/addons/api/tests/unit/adapters/host-test.js
@@ -22,7 +22,7 @@ module('Unit | Adapter | host', function(hooks) {
     // With hostCatalogID...
     mockSnapshot.adapterOptions.hostCatalogID = hostCatalogID;
     url = adapter.buildURL('host', null, mockSnapshot, 'findAll');
-    assert.equal(url, '/v1/scopes/o_1/host-catalogs/hc_098/hosts:my-custom-method');
+    assert.equal(url, '/v1/host-catalogs/hc_098/hosts:my-custom-method');
   });
 
 });
diff --git a/addons/api/tests/unit/serializers/host-catalog-test.js b/addons/api/tests/unit/serializers/host-catalog-test.js
new file mode 100644
index 000000000..64a20b044
--- /dev/null
+++ b/addons/api/tests/unit/serializers/host-catalog-test.js
@@ -0,0 +1,23 @@
+import { module, test } from 'qunit';
+import { setupTest } from 'ember-qunit';
+
+module('Unit | Serializer | host catalog', function(hooks) {
+  setupTest(hooks);
+
+  // Replace this with your real tests.
+  test('it exists', function(assert) {
+    let store = this.owner.lookup('service:store');
+    let serializer = store.serializerFor('host-catalog');
+
+    assert.ok(serializer);
+  });
+
+  test('it serializes records', function(assert) {
+    let store = this.owner.lookup('service:store');
+    let record = store.createRecord('host-catalog', {});
+
+    let serializedRecord = record.serialize();
+
+    assert.ok(serializedRecord);
+  });
+});
diff --git a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs.js b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs.js
index 8ef0f103d..feebc44d2 100644
--- a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs.js
+++ b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs.js
@@ -13,12 +13,12 @@ export default class ScopesScopeProjectsProjectHostCatalogsRoute extends Route {
 
 
   /**
-   * Loads all scopes under the current scope.
+   * Loads all host catalogs under the current scope.
    * @return {Promise{[HostCatalogModel]}}
    */
   async model() {
-    const scopeID = this.modelFor('scopes.scope.projects.project').id;
-    return this.store.findAll('host-catalog', { adapterOptions: { scopeID } });
+    const { id: scope_id } = this.modelFor('scopes.scope.projects.project');
+    return this.store.query('host-catalog', { scope_id });
   }
 
   // =actions
diff --git a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog.js b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog.js
index b9afbdf98..ef495cef4 100644
--- a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog.js
+++ b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog.js
@@ -11,10 +11,7 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogRoute exte
    * @return {HostCatalogModel}
    */
   async model({ host_catalog_id }) {
-    const { id: scopeID } = this.modelFor('scopes.scope');
-    return this.store.findRecord('host-catalog', host_catalog_id, {
-      adapterOptions: { scopeID },
-    });
+    return this.store.findRecord('host-catalog', host_catalog_id);
   }
 
   /**
diff --git a/ui/core/app/routes/scopes/scope/projects/project/targets/target/add-host-sets.js b/ui/core/app/routes/scopes/scope/projects/project/targets/target/add-host-sets.js
index f1fdc55ec..d7723d4f0 100644
--- a/ui/core/app/routes/scopes/scope/projects/project/targets/target/add-host-sets.js
+++ b/ui/core/app/routes/scopes/scope/projects/project/targets/target/add-host-sets.js
@@ -13,10 +13,9 @@ export default class ScopesScopeProjectsProjectTargetsTargetAddHostSetsRoute ext
   // =methods
 
   /**
-   * Empty out any previously loaded host catalogs and host sets.
+   * Empty out any previously loaded host sets.
    */
   beforeModel() {
-    this.store.unloadAll('host-catalog');
     this.store.unloadAll('host-set');
   }
 
@@ -28,8 +27,8 @@ export default class ScopesScopeProjectsProjectTargetsTargetAddHostSetsRoute ext
     const target =
       this.modelFor('scopes.scope.projects.project.targets.target');
     const { scopeID } = target;
-    const hostCatalogs =
-      await this.store.findAll('host-catalog', { adapterOptions: { scopeID } });
+    const { id: scope_id } = this.modelFor('scopes.scope.projects.project');
+    const hostCatalogs = await this.store.query('host-catalog', { scope_id });
     await all(hostCatalogs.map(({ id: hostCatalogID }) =>
       this.store
         .findAll('host-set', { adapterOptions: { scopeID, hostCatalogID } })
diff --git a/ui/core/mirage/config.js b/ui/core/mirage/config.js
index a95797a20..828c3f971 100644
--- a/ui/core/mirage/config.js
+++ b/ui/core/mirage/config.js
@@ -147,40 +147,42 @@ export default function() {
   // Other resources
   // host-catalog
 
-  this.get('/scopes/:scope_id/host-catalogs');
-  this.post('/scopes/:scope_id/host-catalogs');
-  this.get('/scopes/:scope_id/host-catalogs/:id');
-  this.patch('/scopes/:scope_id/host-catalogs/:id');
-  this.del('/scopes/:scope_id/host-catalogs/:id');
+  this.get('/host-catalogs', ({ hostCatalogs }, { queryParams: { scope_id: scopeId } }) => {
+    return hostCatalogs.where({ scopeId });
+  });
+  this.post('/host-catalogs');
+  this.get('/host-catalogs/:id');
+  this.patch('/host-catalogs/:id');
+  this.del('/host-catalogs/:id');
 
   // host
 
-  this.get('/scopes/:scope_id/host-catalogs/:hostCatalogId/hosts', function ({ hosts }, { params: { hostCatalogId } }) {
+  this.get('/host-catalogs/:hostCatalogId/hosts', function ({ hosts }, { params: { hostCatalogId } }) {
     return hosts.where({ hostCatalogId });
   });
-  this.post('/scopes/:scope_id/host-catalogs/:hostCatalogId/hosts', function ({ hosts }, { params: { hostCatalogId } }) {
+  this.post('/host-catalogs/:hostCatalogId/hosts', function ({ hosts }, { params: { hostCatalogId } }) {
     const attrs = this.normalizedRequestAttrs();
     attrs.hostCatalogId = hostCatalogId;
     return hosts.create(attrs);
   });
-  this.get('/scopes/:scope_id/host-catalogs/:hostCatalogId/hosts/:id');
-  this.patch('/scopes/:scope_id/host-catalogs/:hostCatalogId/hosts/:id');
-  this.del('/scopes/:scope_id/host-catalogs/:hostCatalogId/hosts/:id');
+  this.get('/host-catalogs/:hostCatalogId/hosts/:id');
+  this.patch('/host-catalogs/:hostCatalogId/hosts/:id');
+  this.del('/host-catalogs/:hostCatalogId/hosts/:id');
 
   // host-set
 
-  this.get('/scopes/:scope_id/host-catalogs/:hostCatalogId/host-sets', function ({ hostSets }, { params: { hostCatalogId } }) {
+  this.get('/host-catalogs/:hostCatalogId/host-sets', function ({ hostSets }, { params: { hostCatalogId } }) {
     return hostSets.where({ hostCatalogId });
   });
-  this.post('/scopes/:scope_id/host-catalogs/:hostCatalogId/host-sets', function ({ hostSets }, { params: { hostCatalogId } }) {
+  this.post('/host-catalogs/:hostCatalogId/host-sets', function ({ hostSets }, { params: { hostCatalogId } }) {
     const attrs = this.normalizedRequestAttrs();
     attrs.hostCatalogId = hostCatalogId;
     return hostSets.create(attrs);
   });
-  this.get('/scopes/:scope_id/host-catalogs/:hostCatalogId/host-sets/:id');
-  this.patch('/scopes/:scope_id/host-catalogs/:hostCatalogId/host-sets/:id');
-  this.del('/scopes/:scope_id/host-catalogs/:hostCatalogId/host-sets/:id');
-  this.post('/scopes/:scope_id/host-catalogs/:hostCatalogId/host-sets/:idMethod', function ({ hostSets }, { params: { idMethod } }) {
+  this.get('/host-catalogs/:hostCatalogId/host-sets/:id');
+  this.patch('/host-catalogs/:hostCatalogId/host-sets/:id');
+  this.del('/host-catalogs/:hostCatalogId/host-sets/:id');
+  this.post('/host-catalogs/:hostCatalogId/host-sets/:idMethod', function ({ hostSets }, { params: { idMethod } }) {
     const attrs = this.normalizedRequestAttrs();
     const id = idMethod.split(':')[0];
     const method = idMethod.split(':')[1];
diff --git a/ui/core/mirage/factories/host-catalog.js b/ui/core/mirage/factories/host-catalog.js
index b6ce98947..15ae0bb26 100644
--- a/ui/core/mirage/factories/host-catalog.js
+++ b/ui/core/mirage/factories/host-catalog.js
@@ -6,8 +6,9 @@ export default factory.extend({
   withChildren: trait({
     afterCreate(hostCatalog, server) {
       const scope = hostCatalog.scope;
-      const hosts = server.createList('host', 10, { scope, hostCatalog });
-      server.createList('host-set', 3, { scope, hostCatalog, hosts });
+      const scopePojo = { id: scope.id, type: scope.type };
+      const hosts = server.createList('host', 10, { scope: scopePojo, hostCatalog });
+      server.createList('host-set', 3, { scope: scopePojo, hostCatalog, hosts });
     }
   })
 
diff --git a/ui/core/mirage/models/host-catalog.js b/ui/core/mirage/models/host-catalog.js
new file mode 100644
index 000000000..08b1f5ad3
--- /dev/null
+++ b/ui/core/mirage/models/host-catalog.js
@@ -0,0 +1,7 @@
+import { Model, belongsTo } from 'ember-cli-mirage';
+
+export default Model.extend({
+
+  scope: belongsTo()
+
+});
diff --git a/ui/core/mirage/scenarios/default.js b/ui/core/mirage/scenarios/default.js
index c878699ef..1524a7647 100644
--- a/ui/core/mirage/scenarios/default.js
+++ b/ui/core/mirage/scenarios/default.js
@@ -24,8 +24,7 @@ export default function(server) {
 
   // Other resources
   server.schema.scopes.where({type: 'project'}).models.forEach(scope => {
-    const scopePojo = { id: scope.id, type: scope.type };
-    server.createList('host-catalog', 2, { scope: scopePojo }, 'withChildren');
+    server.createList('host-catalog', 2, { scope }, 'withChildren');
     server.createList('target', 2, { scope }, 'withRandomHostSets');
   });
 
diff --git a/ui/core/mirage/serializers/host-catalog.js b/ui/core/mirage/serializers/host-catalog.js
index e7b237047..34277f96e 100644
--- a/ui/core/mirage/serializers/host-catalog.js
+++ b/ui/core/mirage/serializers/host-catalog.js
@@ -1,5 +1,22 @@
 import ApplicationSerializer from './application';
+import { underscore } from '@ember/string';
 
 export default ApplicationSerializer.extend({
-  modelName: 'host-catalog'
+  modelName: 'host-catalog',
+
+  keyForRelationshipId(relationshipName) {
+    return `${this._container.inflector.singularize(
+      underscore(relationshipName)
+    )}_id`;
+  },
+
+  _hashForModel(model) {
+    const json = ApplicationSerializer.prototype._hashForModel.apply(this, arguments);
+    json.scope = {
+      id: model.scope.id,
+      type: model.scope.type
+    };
+    return json;
+  }
+
 });
diff --git a/ui/core/tests/acceptance/bread-crumbs-test.js b/ui/core/tests/acceptance/bread-crumbs-test.js
index 9400e9dbe..4dc48c832 100644
--- a/ui/core/tests/acceptance/bread-crumbs-test.js
+++ b/ui/core/tests/acceptance/bread-crumbs-test.js
@@ -45,12 +45,7 @@ module('Acceptance | breadcrumbs', function (hooks) {
     user = this.server.create('user', { scope: orgScope });
     role = this.server.create('role', { scope: orgScope });
     group = this.server.create('group', { scope: orgScope });
-    hostCatalog = this.server.create('host-catalog', {
-      scope: {
-        id: project.id,
-        type: project.type
-      }
-    });
+    hostCatalog = this.server.create('host-catalog', { scope: getProjectScope() });
 
     projectsURL = `/scopes/${orgScope.id}/projects`;
     newProjectURL = `${projectsURL}/new`;
diff --git a/ui/core/tests/acceptance/host-catalogs-test.js b/ui/core/tests/acceptance/host-catalogs-test.js
index 3b79331c9..f88332113 100644
--- a/ui/core/tests/acceptance/host-catalogs-test.js
+++ b/ui/core/tests/acceptance/host-catalogs-test.js
@@ -36,16 +36,13 @@ module('Acceptance | host catalogs', function (hooks) {
     // Setup Mirage mock resources for this test
     instances.scopes.global = this.server.create('scope', { id: 'global' });
     instances.scopes.org = this.server.create('scope', { type: 'org',
-      scope: { id: instances.scopes.global.id, type: instances.scopes.global.type }
+      scope: { id: 'global', type: 'global' }
     });
     instances.scopes.project = this.server.create('scope', { type: 'project',
-      scope: { id: instances.scopes.org.id, type: instances.scopes.org.type }
+      scope: { id: instances.scopes.org.id, type: 'org' }
     });
     instances.hostCatalog = this.server.create('host-catalog', {
-      scope: {
-        id: instances.scopes.project.id,
-        type: instances.scopes.project.type
-      }
+      scope: instances.scopes.project
     });
 
     // Generate route URLs for resources
@@ -124,7 +121,7 @@ module('Acceptance | host catalogs', function (hooks) {
 
   test('errors are displayed when save host catalog fails', async function (assert) {
     assert.expect(1);
-    this.server.patch('/scopes/:scope_id/host-catalogs/:id', () => {
+    this.server.patch('/host-catalogs/:id', () => {
       return new Response(
         490,
         {},
@@ -149,7 +146,7 @@ module('Acceptance | host catalogs', function (hooks) {
 
   test('errors are displayed when delete host catalog fails', async function (assert) {
     assert.expect(1);
-    this.server.del('/scopes/:scope_id/host-catalogs/:id', () => {
+    this.server.del('/host-catalogs/:id', () => {
       return new Response(
         490,
         {},
@@ -173,7 +170,7 @@ module('Acceptance | host catalogs', function (hooks) {
 
   test('saving a new host catalog with invalid fields displays error messages', async function (assert) {
     assert.expect(2);
-    this.server.post('/scopes/:scope_id/host-catalogs', () => {
+    this.server.post('/host-catalogs', () => {
       return new Response(
         400,
         {},
@@ -211,7 +208,7 @@ module('Acceptance | host catalogs', function (hooks) {
 
   test('saving an existing host catalog with invalid fields displays error messages', async function (assert) {
     assert.expect(2);
-    this.server.patch('/scopes/:scope_id/host-catalogs/:id', () => {
+    this.server.patch('/host-catalogs/:id', () => {
       return new Response(
         400,
         {},