diff --git a/addons/api/addon/adapters/application.js b/addons/api/addon/adapters/application.js
index 85bf2f829..8a072b077 100644
--- a/addons/api/addon/adapters/application.js
+++ b/addons/api/addon/adapters/application.js
@@ -1,7 +1,7 @@
 import RESTAdapter from '@ember-data/adapter/rest';
 import AdapterBuildURLMixin from '../mixins/adapter-build-url';
 import config from 'ember-get-config';
-import { get } from '@ember/object';
+import { get, getWithDefault } from '@ember/object';
 import { InvalidError } from '@ember-data/adapter/error';
 import { dasherize } from '@ember/string';
 import { pluralize } from 'ember-inflector';
@@ -58,6 +58,40 @@ export default class ApplicationAdapter extends RESTAdapter.extend(
 
   // =methods
 
+  /**
+   * Prepends a scope to the URL prefix, if a scope is passed via the
+   * snapshot's `adapterOptions.scope_id` field.
+   * @override
+   * @param {string} path
+   * @param {string} parentURL
+   * @param {string} modelName
+   * @param {string} id
+   * @param {object} snapshot
+   * @return {string}
+   */
+  urlPrefix(path, parentURL, modelName, id, snapshot={}) {
+    const prefix = super.urlPrefix(...arguments);
+    let scopePath = getWithDefault(snapshot, 'adapterOptions.scope_id', '');
+    // Ensure a slash is added between prefix + scope path if needed.
+    if (scopePath && prefix.charAt(prefix.length - 1) !== '/') {
+      scopePath = `/${scopePath}`;
+    }
+    return `${prefix}${scopePath}`;
+  }
+
+  /**
+   * Appends a custom method after a colon, if a method is passed via the
+   * snapshot's `adapterOptions.method` field.
+   * @param {string} modelName
+   * @param {string} id
+   * @param {object} snapshot
+   * @return {string}
+   */
+  urlSuffix(modelName, id, snapshot={}) {
+    const method = getWithDefault(snapshot, 'adapterOptions.method', '');
+    return method ? `:${method}` : '';
+  }
+
   /**
    * Transforms the type to a dasherized string used in our API paths.
    *
diff --git a/addons/api/addon/mixins/adapter-build-url.js b/addons/api/addon/mixins/adapter-build-url.js
index 8ff6d3474..264364d0d 100644
--- a/addons/api/addon/mixins/adapter-build-url.js
+++ b/addons/api/addon/mixins/adapter-build-url.js
@@ -16,36 +16,35 @@ export default Mixin.create({
 
   // =methods
 
+  /**
+   * This override behaves identically to the default method by default.
+   * It exists only to document the additional paramters to the method.
+   * @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 */) {
+    // What's this super syntax?
+    // Ember mixins are still based on the older Ember Object, rather than
+    // native ES classes.  Thus we have to call super in this strange way.
+    // https://blog.emberjs.com/2019/01/26/emberjs-native-class-update-2019-edition.html
+    return this._super(...arguments);
+  },
 
-    /**
-     * This override behaves identically to the default method by default.
-     * It exists only to document the additional paramters to the method.
-     * @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 */) {
-      // What's this super syntax?
-      // Ember mixins are still based on the older Ember Object, rather than
-      // native ES classes.  Thus we have to call super in this strange way.
-      // https://blog.emberjs.com/2019/01/26/emberjs-native-class-update-2019-edition.html
-      return this._super(...arguments);
-    },
-
-    /**
-     * Generates a string to be appended to a URL.  Empty string by default.
-     * @param {string} modelName
-     * @param {string} id
-     * @param {?object} snapshot
-     * @return {string}
-     */
-    urlSuffix(/* modelName, id, snapshot */) {
-      return '';
-    },
+  /**
+   * Generates a string to be appended to a URL.  Empty string by default.
+   * @param {string} modelName
+   * @param {string} id
+   * @param {?object} snapshot
+   * @return {string}
+   */
+  urlSuffix(/* modelName, id, snapshot */) {
+    return '';
+  },
 
   /**
    * Overrides the default `_buildURL` with a nearly identical version.
@@ -73,6 +72,82 @@ export default Mixin.create({
     url = url.join('/');
     if (!host && url && url.charAt(0) !== '/') url = '/' + url;
     return `${url}${suffix}`;
+  },
+
+  /**
+   * Overrides the default method simply to pass an additional argument
+   * `snapshot` to the `_buildURL` method.
+   * @override
+   * @param {string} id
+   * @param {string} modelName
+   * @param {object} snapshot
+   * @return {string}
+   */
+  urlForFindRecord(id, modelName, snapshot) {
+    return this._buildURL(modelName, id, snapshot);
+  },
+
+  /**
+   * Overrides the default method simply to pass an additional argument
+   * `snapshot` to the `_buildURL` method.
+   * @override
+   * @param {string} modelName
+   * @param {object} snapshot
+   * @return {string}
+   */
+  urlForFindAll(modelName, snapshot) {
+    return this._buildURL(modelName, null, snapshot);
+  },
+
+  /**
+   * Overrides the default method simply to pass an additional argument
+   * `snapshot` to the `_buildURL` method.
+   * @override
+   * @param {string} id
+   * @param {string} modelName
+   * @param {object} snapshot
+   * @return {string}
+   */
+  urlForFindBelongsTo(id, modelName, snapshot) {
+    return this._buildURL(modelName, id, snapshot);
+  },
+
+  /**
+   * Overrides the default method simply to pass an additional argument
+   * `snapshot` to the `_buildURL` method.
+   * @override
+   * @param {string} modelName
+   * @param {object} snapshot
+   * @return {string}
+   */
+  urlForCreateRecord(modelName, snapshot) {
+    return this._buildURL(modelName, null, snapshot);
+  },
+
+  /**
+   * Overrides the default method simply to pass an additional argument
+   * `snapshot` to the `_buildURL` method.
+   * @override
+   * @param {string} id
+   * @param {string} modelName
+   * @param {object} snapshot
+   * @return {string}
+   */
+  urlForUpdateRecord(id, modelName, snapshot) {
+    return this._buildURL(modelName, id, snapshot);
+  },
+
+  /**
+   * Overrides the default method simply to pass an additional argument
+   * `snapshot` to the `_buildURL` method.
+   * @override
+   * @param {string} id
+   * @param {string} modelName
+   * @param {object} snapshot
+   * @return {string}
+   */
+  urlForDeleteRecord(id, modelName, snapshot) {
+    return this._buildURL(modelName, id, snapshot);
   }
 
 });
diff --git a/addons/api/tests/unit/adapters/application-test.js b/addons/api/tests/unit/adapters/application-test.js
index f84fc92ff..bec9d581b 100644
--- a/addons/api/tests/unit/adapters/application-test.js
+++ b/addons/api/tests/unit/adapters/application-test.js
@@ -18,9 +18,64 @@ module('Unit | Adapter | application', function (hooks) {
   });
 
   test('it generates correct URL prefixes', function (assert) {
+    assert.expect(2);
+    const adapter = this.owner.lookup('adapter:application');
+    assert.ok(config.api.namespace);
+    assert.equal(adapter.urlPrefix(), config.api.namespace);
+  });
+
+  test('it generates URL prefixes with optional `scope_id` from adapterOptions', function (assert) {
+    assert.expect(2);
+    const scope_id = 'global';
+    const adapter = this.owner.lookup('adapter:application');
+    const prefix = adapter.urlPrefix(null, null, null, null, {
+      adapterOptions: {scope_id}
+    });
+    assert.ok(config.api.namespace);
+    assert.equal(prefix, `v1/${scope_id}`);
+  });
+
+  test('it generates correct default URL suffixes', function (assert) {
     assert.expect(1);
     const adapter = this.owner.lookup('adapter:application');
-    assert.equal(adapter.urlPrefix(), config.api.namespace);
+    assert.equal(adapter.urlSuffix(), '');
+  });
+
+  test('it generates URL suffixes with optional `method` from adapterOptions', function (assert) {
+    assert.expect(2);
+    const method = 'set-something';
+    const adapter = this.owner.lookup('adapter:application');
+    const suffix = adapter.urlSuffix(null, null, {
+      adapterOptions: {method}
+    });
+    assert.ok(config.api.namespace);
+    assert.equal(suffix, ':set-something');
+  });
+
+  test('it generates correct complete URLs', function (assert) {
+    assert.expect(6);
+    const scope_id = 'o_1';
+    const method = 'my-custom-method';
+    const mockSnapshot = {
+      adapterOptions: {
+        scope_id,
+        method
+      }
+    };
+    const adapter = this.owner.lookup('adapter:application');
+    // test URL generation for each request type...
+    const findRecordURL = adapter.buildURL('project', '1', mockSnapshot, 'findRecord');
+    assert.equal(findRecordURL, '/v1/o_1/projects/1:my-custom-method');
+    const findAllURL = adapter.buildURL('project', null, mockSnapshot, 'findAll');
+    assert.equal(findAllURL, '/v1/o_1/projects:my-custom-method');
+    const findBelongsToURL = adapter.buildURL('project', '2', mockSnapshot, 'findBelongsTo');
+    assert.equal(findBelongsToURL, '/v1/o_1/projects/2:my-custom-method');
+    const createRecordURL = adapter.buildURL('project', null, mockSnapshot, 'createRecord');
+    assert.equal(createRecordURL, '/v1/o_1/projects:my-custom-method');
+    const updateRecordURL = adapter.buildURL('project', '3', mockSnapshot, 'updateRecord');
+    assert.equal(updateRecordURL, '/v1/o_1/projects/3:my-custom-method');
+    const deleteRecordURL = adapter.buildURL('project', '4', mockSnapshot, 'deleteRecord');
+    assert.equal(deleteRecordURL, '/v1/o_1/projects/4:my-custom-method');
   });
 
   test('it rewrites PUT to PATCH, but leaves others unchanged', function (assert) {