diff --git a/addons/api/addon/adapters/host-set.js b/addons/api/addon/adapters/host-set.js
new file mode 100644
index 000000000..fbbe11495
--- /dev/null
+++ b/addons/api/addon/adapters/host-set.js
@@ -0,0 +1,38 @@
+import ApplicationAdapter from './application';
+import { inject as service } from '@ember/service';
+
+export default class HostSetAdapter extends ApplicationAdapter {
+
+  // =services
+
+  @service store;
+
+  // =methods
+
+  /**
+   * Append a host catalog URL ahead of the host sets path if `hostCatalogID` is
+   * passed via adapter options.  Otherwise, generate the prefix as normal.
+   *
+   * TODO:  generalize the interface to resource-prefixed URLs by accepting
+   *        a modelName and an ID, rather than looking for a known key.
+   *
+   * @override
+   * @param {string} path
+   * @param {string} parentURL
+   * @param {string} modelName
+   * @param {string} id
+   * @param {object} snapshot
+   * @return {string} urlPrefix
+   */
+  urlPrefix(path, parentURL, modelName, id, snapshot) {
+    const hostCatalogID = snapshot?.adapterOptions?.hostCatalogID;
+    if (hostCatalogID) {
+      const hostCatalogAdapter = this.store.adapterFor('host-catalog');
+      return hostCatalogAdapter
+        ._buildPrefixedURL('host-catalog', hostCatalogID, snapshot);
+    } else {
+      return super.urlPrefix(...arguments);
+    }
+  }
+
+}
diff --git a/addons/api/addon/mixins/adapter-build-url.js b/addons/api/addon/mixins/adapter-build-url.js
index 264364d0d..cee278e05 100644
--- a/addons/api/addon/mixins/adapter-build-url.js
+++ b/addons/api/addon/mixins/adapter-build-url.js
@@ -46,6 +46,31 @@ export default Mixin.create({
     return '';
   },
 
+  /**
+   * Builds the (mostly full) URL with a prefix, but not the suffix.
+   * The `_buildURL` method adds a suffix.
+   * Do not call directly.
+   * @override
+   * @param {String} modelName
+   * @param {String} id
+   * @return {String} url
+   */
+  _buildPrefixedURL(modelName, id, snapshot) {
+    let path;
+    let url = [];
+    const host = get(this, 'host');
+    const prefix = this.urlPrefix(null, null, modelName, id, snapshot);
+    if (modelName) {
+      path = this.pathForType(modelName);
+      if (path) url.push(path);
+    }
+    if (id) url.push(encodeURIComponent(id));
+    if (prefix) url.unshift(prefix);
+    url = url.join('/');
+    if (!host && url && url.charAt(0) !== '/') url = '/' + url;
+    return `${url}`;
+  },
+
   /**
    * Overrides the default `_buildURL` with a nearly identical version.
    * This method simply passes arguments into the `urlPrefix` method for
@@ -58,19 +83,8 @@ export default Mixin.create({
    * @return {String} url
    */
   _buildURL(modelName, id, snapshot) {
-    let path;
-    let url = [];
-    const host = get(this, 'host');
-    const prefix = this.urlPrefix(null, null, modelName, id, snapshot);
+    const url = this._buildPrefixedURL(modelName, id, snapshot);
     const suffix = this.urlSuffix(modelName, id, snapshot);
-    if (modelName) {
-      path = this.pathForType(modelName);
-      if (path) url.push(path);
-    }
-    if (id) url.push(encodeURIComponent(id));
-    if (prefix) url.unshift(prefix);
-    url = url.join('/');
-    if (!host && url && url.charAt(0) !== '/') url = '/' + url;
     return `${url}${suffix}`;
   },
 
diff --git a/addons/api/app/adapters/host-set.js b/addons/api/app/adapters/host-set.js
new file mode 100644
index 000000000..958a53f64
--- /dev/null
+++ b/addons/api/app/adapters/host-set.js
@@ -0,0 +1 @@
+export { default } from 'api/adapters/host-set';
diff --git a/addons/api/tests/unit/adapters/host-set-test.js b/addons/api/tests/unit/adapters/host-set-test.js
new file mode 100644
index 000000000..e47c7a7d6
--- /dev/null
+++ b/addons/api/tests/unit/adapters/host-set-test.js
@@ -0,0 +1,28 @@
+import { module, test } from 'qunit';
+import { setupTest } from 'ember-qunit';
+
+module('Unit | Adapter | host set', function(hooks) {
+  setupTest(hooks);
+
+  test('it generates correct complete URLs', function (assert) {
+    assert.expect(2);
+    const scopeID = 'o_1';
+    const hostCatalogID = 'hc_098';
+    const method = 'my-custom-method';
+    const mockSnapshot = {
+      adapterOptions: {
+        scopeID,
+        method
+      }
+    };
+    const adapter = this.owner.lookup('adapter:host-set');
+    // Without hostCatalogID...
+    let url = adapter.buildURL('host-set', null, mockSnapshot, 'findAll');
+    assert.equal(url, '/v1/scopes/o_1/host-sets:my-custom-method');
+    // 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');
+  });
+
+});