diff --git a/addons/api/addon/adapters/host-catalog.js b/addons/api/addon/adapters/host-catalog.js
new file mode 100644
index 000000000..3f1fab706
--- /dev/null
+++ b/addons/api/addon/adapters/host-catalog.js
@@ -0,0 +1,23 @@
+import ApplicationAdapter from './application';
+
+export default class HostCatalogAdapter extends ApplicationAdapter {
+  /**
+   * Overrides the default `buildURL` such that on _create_, URLs for records of
+   * type `plugin` get an extra query parameter `?plugin_name`.  All other
+   * request types behave as normal.
+   *
+   * @override
+   * @param {string} modelName
+   * @param {string} id
+   * @return {string} url
+   * @return {string} requestType
+   */
+  buildURL(modelName, id, snapshot, requestType) {
+    let url = super.buildURL(...arguments);
+    if (requestType === 'createRecord') {
+      const pluginName = snapshot.attr('plugin')?.name;
+      if (pluginName) url = `${url}?plugin_name=${pluginName}`;
+    }
+    return url;
+  }
+}
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/mirage/config.js b/addons/api/mirage/config.js
index 759eb63c3..bb969a04c 100644
--- a/addons/api/mirage/config.js
+++ b/addons/api/mirage/config.js
@@ -270,7 +270,19 @@ export default function () {
       return hostCatalogs.where({ scopeId });
     }
   );
-  this.post('/host-catalogs');
+  this.post(
+    '/host-catalogs',
+    function ({ hostCatalogs }, { queryParams: { plugin_name } }) {
+      const attrs = this.normalizedRequestAttrs();
+      if (plugin_name) {
+        attrs.type = 'plugin';
+        attrs.plugin = {
+          name: plugin_name,
+        };
+      }
+      return hostCatalogs.create(attrs);
+    }
+  );
   this.get('/host-catalogs/:id');
   this.patch('/host-catalogs/:id');
   this.del('/host-catalogs/:id');
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..2df45a117
--- /dev/null
+++ b/addons/api/tests/unit/adapters/host-catalog-test.js
@@ -0,0 +1,48 @@
+import { module, test } from 'qunit';
+import { setupTest } from 'ember-qunit';
+
+module('Unit | Adapter | host catalog', function (hooks) {
+  setupTest(hooks);
+
+  test('it generates correct createRecord URLs for static host catalogs', function (assert) {
+    assert.expect(1);
+    const scopeID = 'o_1';
+    const mockSnapshot = {
+      adapterOptions: {
+        scopeID,
+      },
+      attr() {
+        return null;
+      },
+    };
+    const adapter = this.owner.lookup('adapter:host-catalog');
+    const createRecordURL = adapter.buildURL(
+      'host-catalog',
+      null,
+      mockSnapshot,
+      'createRecord'
+    );
+    assert.equal(createRecordURL, '/v1/host-catalogs');
+  });
+
+  test('it generates correct createRecord URLs for dynamic host catalogs with extra query parameter ?plugin_name', function (assert) {
+    assert.expect(1);
+    const scopeID = 'o_1';
+    const mockSnapshot = {
+      adapterOptions: {
+        scopeID,
+      },
+      attr() {
+        return { name: 'aws' };
+      },
+    };
+    const adapter = this.owner.lookup('adapter:host-catalog');
+    const createRecordURL = adapter.buildURL(
+      'host-catalog',
+      null,
+      mockSnapshot,
+      'createRecord'
+    );
+    assert.equal(createRecordURL, '/v1/host-catalogs?plugin_name=aws');
+  });
+});