diff --git a/docs/source/configuration/environmentvariables.md b/docs/source/configuration/environmentvariables.md
index 1c9979a6e84..5801005e865 100644
--- a/docs/source/configuration/environmentvariables.md
+++ b/docs/source/configuration/environmentvariables.md
@@ -66,6 +66,12 @@ You can also generate builds on your continuous integration, then deploy them an
 
 ```{glossary}
 :sorted:
+`RAZZLE_API_SUFFIX`
+    Overrides the API traversal suffix that Volto appends to API URLs.
+    The default suffix is `/++api++`.
+    Set this variable to use a different suffix, or set `config.settings.apiSuffix` directly in your Volto configuration.
+    This setting takes precedence over `RAZZLE_LEGACY_TRAVERSE`.
+
 `RAZZLE_LEGACY_TRAVERSE`
     If `true`, Volto will construct API URLs without the `/++api++` prefix.
 
diff --git a/packages/types/src/config/Settings.d.ts b/packages/types/src/config/Settings.d.ts
index 38098f1c310..74826253519 100644
--- a/packages/types/src/config/Settings.d.ts
+++ b/packages/types/src/config/Settings.d.ts
@@ -56,6 +56,7 @@ export interface SettingsConfig {
   actions_raising_api_errors: string[];
   internalApiPath: string | undefined;
   websockets: string | false;
+  apiSuffix: string | undefined;
   legacyTraverse: string | false;
   cookieExpires: number;
   nonContentRoutes: Array<string | RegExp>;
diff --git a/packages/volto/news/+configurable-api-suffix.feature b/packages/volto/news/+configurable-api-suffix.feature
new file mode 100644
index 00000000000..81bc9fc2dca
--- /dev/null
+++ b/packages/volto/news/+configurable-api-suffix.feature
@@ -0,0 +1 @@
+Add the `apiSuffix` setting and `RAZZLE_API_SUFFIX` environment variable to configure the API traversal suffix.
diff --git a/packages/volto/src/config/index.js b/packages/volto/src/config/index.js
index 3fce081f201..b6ec67a6c40 100644
--- a/packages/volto/src/config/index.js
+++ b/packages/volto/src/config/index.js
@@ -102,6 +102,8 @@ let config = {
     internalApiPath: process.env.RAZZLE_INTERNAL_API_PATH || undefined,
     subpathPrefix: process.env.RAZZLE_SUBPATH_PREFIX || '',
     websockets: process.env.RAZZLE_WEBSOCKETS || false,
+    // Overrides the API traversal suffix. An empty string disables it.
+    apiSuffix: process.env.RAZZLE_API_SUFFIX,
     // TODO: legacyTraverse to be removed when the use of the legacy traverse is deprecated.
     legacyTraverse: process.env.RAZZLE_LEGACY_TRAVERSE || false,
     cookieExpires: 15552000, //in seconds. Default is 6 month (15552000)
diff --git a/packages/volto/src/helpers/Api/APIResourceWithAuth.js b/packages/volto/src/helpers/Api/APIResourceWithAuth.js
index 666e1c2804d..49ff61b0780 100644
--- a/packages/volto/src/helpers/Api/APIResourceWithAuth.js
+++ b/packages/volto/src/helpers/Api/APIResourceWithAuth.js
@@ -6,7 +6,7 @@
 import superagent from 'superagent';
 import config from '@plone/volto/registry';
 import { addHeadersFactory } from '@plone/volto/helpers/Proxy/Proxy';
-import { stripSubpathPrefix } from '@plone/volto/helpers/Url/Url';
+import { getApiSuffix, stripSubpathPrefix } from '@plone/volto/helpers/Url/Url';
 
 /**
  * Get a resource image/file with authenticated (if token exist) API headers
@@ -17,7 +17,7 @@ import { stripSubpathPrefix } from '@plone/volto/helpers/Url/Url';
 export const getAPIResourceWithAuth = (req) =>
   new Promise((resolve, reject) => {
     const { settings } = config;
-    const apiSuffix = settings.legacyTraverse ? '' : '/++api++';
+    const apiSuffix = getApiSuffix();
     let apiPath = '';
 
     if (settings.internalApiPath && __SERVER__) {
diff --git a/packages/volto/src/helpers/Api/Api.js b/packages/volto/src/helpers/Api/Api.js
index 1741cb1fe81..9bd53f8b9a7 100644
--- a/packages/volto/src/helpers/Api/Api.js
+++ b/packages/volto/src/helpers/Api/Api.js
@@ -8,6 +8,7 @@ import Cookies from 'universal-cookie';
 import config from '@plone/volto/registry';
 import { addHeadersFactory } from '@plone/volto/helpers/Proxy/Proxy';
 import {
+  getApiSuffix,
   stripQuerystring,
   stripSubpathPrefix,
 } from '@plone/volto/helpers/Url/Url';
@@ -22,7 +23,7 @@ const methods = ['get', 'post', 'put', 'patch', 'del'];
  */
 export function formatUrl(path) {
   const { settings } = config;
-  const apiSuffix = settings.legacyTraverse ? '' : '/++api++';
+  const apiSuffix = getApiSuffix();
 
   if (path.startsWith('http://') || path.startsWith('https://')) return path;
 
diff --git a/packages/volto/src/helpers/Api/Api.plone.rest.test.js b/packages/volto/src/helpers/Api/Api.plone.rest.test.js
index 13ea2dfd454..d0330ed3bf8 100644
--- a/packages/volto/src/helpers/Api/Api.plone.rest.test.js
+++ b/packages/volto/src/helpers/Api/Api.plone.rest.test.js
@@ -15,6 +15,7 @@ vi.mock('superagent', () => ({
 }));
 
 beforeAll(() => {
+  config.settings.apiSuffix = undefined;
   config.settings.legacyTraverse = false;
 });
 
@@ -41,4 +42,10 @@ describe('Api', () => {
     const promise = api.get('https://example.com');
     expect(promise.request.url).toBe('https://example.com');
   });
+  it('uses the configured API suffix', () => {
+    config.settings.apiSuffix = '/custom-api';
+    const promise = api.get('/test');
+    expect(promise.request.url).toBe(`${settings.apiPath}/custom-api/test`);
+    config.settings.apiSuffix = undefined;
+  });
 });
diff --git a/packages/volto/src/helpers/Api/PloneBackendAPIResourceWithAuth.js b/packages/volto/src/helpers/Api/PloneBackendAPIResourceWithAuth.js
index f16b4265534..b6e11d42200 100644
--- a/packages/volto/src/helpers/Api/PloneBackendAPIResourceWithAuth.js
+++ b/packages/volto/src/helpers/Api/PloneBackendAPIResourceWithAuth.js
@@ -1,7 +1,7 @@
 import superagent from 'superagent';
 import config from '@plone/volto/registry';
 import { addHeadersFactory } from '@plone/volto/helpers/Proxy/Proxy';
-import { stripSubpathPrefix } from '@plone/volto/helpers/Url/Url';
+import { getApiSuffix, stripSubpathPrefix } from '@plone/volto/helpers/Url/Url';
 
 /**
  * Get a resource from Plone Backend (/++api++) with authenticated (if token exist) API headers
@@ -12,7 +12,7 @@ import { stripSubpathPrefix } from '@plone/volto/helpers/Url/Url';
 export const getPloneBackendAPIResourceWithAuth = (req) =>
   new Promise((resolve, reject) => {
     const { settings } = config;
-    const apiSuffix = settings.legacyTraverse ? '' : '/++api++';
+    const apiSuffix = getApiSuffix();
     let apiPath = '';
 
     if (settings.internalApiPath && __SERVER__) {
diff --git a/packages/volto/src/helpers/Api/PloneBackendAPIResourceWithAuth.test.js b/packages/volto/src/helpers/Api/PloneBackendAPIResourceWithAuth.test.js
index 25de85ffbe8..49d6eb650f2 100644
--- a/packages/volto/src/helpers/Api/PloneBackendAPIResourceWithAuth.test.js
+++ b/packages/volto/src/helpers/Api/PloneBackendAPIResourceWithAuth.test.js
@@ -30,6 +30,7 @@ describe('getPloneBackendAPIResourceWithAuth', () => {
       apiPath: 'http://localhost:3000',
       devProxyToApiPath: 'http://localhost:8080/Plone',
       internalApiPath: undefined,
+      apiSuffix: undefined,
     });
   });
 
@@ -57,4 +58,15 @@ describe('getPloneBackendAPIResourceWithAuth', () => {
       'http://localhost:8080/Plone/@portrait/admin',
     );
   });
+
+  it('uses apiSuffix in preference to legacyTraverse in development', async () => {
+    config.settings.legacyTraverse = true;
+    config.settings.apiSuffix = '/custom-api';
+
+    await getPloneBackendAPIResourceWithAuth(request);
+
+    expect(superagent.get).toHaveBeenCalledWith(
+      'http://localhost:8080/Plone/custom-api/@portrait/admin',
+    );
+  });
 });
diff --git a/packages/volto/src/helpers/Sitemap/Sitemap.js b/packages/volto/src/helpers/Sitemap/Sitemap.js
index b3946e3f111..834a33d03ae 100644
--- a/packages/volto/src/helpers/Sitemap/Sitemap.js
+++ b/packages/volto/src/helpers/Sitemap/Sitemap.js
@@ -6,7 +6,7 @@
 import superagent from 'superagent';
 import map from 'lodash/map';
 import zlib from 'zlib';
-import { toPublicURL } from '@plone/volto/helpers/Url/Url';
+import { getApiSuffix, toPublicURL } from '@plone/volto/helpers/Url/Url';
 import { addHeadersFactory } from '@plone/volto/helpers/Proxy/Proxy';
 
 import config from '@plone/volto/registry';
@@ -22,7 +22,7 @@ export const SITEMAP_BATCH_SIZE = 5000;
 export const generateSitemap = (_req, start = 0, size = undefined) =>
   new Promise((resolve) => {
     const { settings } = config;
-    const apiSuffix = settings.legacyTraverse ? '' : '/++api++';
+    const apiSuffix = getApiSuffix();
     const apiPath = settings.internalApiPath ?? settings.apiPath;
     const request = superagent.get(
       `${apiPath}${apiSuffix}/@search?metadata_fields=modified&b_start=${start}&b_size=${
@@ -64,7 +64,7 @@ export const generateSitemap = (_req, start = 0, size = undefined) =>
 export const generateSitemapIndex = (_req, gzip = false) =>
   new Promise((resolve) => {
     const { settings } = config;
-    const apiSuffix = settings.legacyTraverse ? '' : '/++api++';
+    const apiSuffix = getApiSuffix();
     const apiPath = settings.internalApiPath ?? settings.apiPath;
     const request = superagent.get(
       `${apiPath}${apiSuffix}/@search?metadata_fields=modified&b_size=0&use_site_search_settings=1`,
diff --git a/packages/volto/src/helpers/Url/Url.js b/packages/volto/src/helpers/Url/Url.js
index a4358771edd..a9b7bde63b2 100644
--- a/packages/volto/src/helpers/Url/Url.js
+++ b/packages/volto/src/helpers/Url/Url.js
@@ -182,6 +182,17 @@ export function addAppURL(url) {
     : `${settings.apiPath}${url}`;
 }
 
+/**
+ * Get the API traversal suffix.
+ *
+ * An explicitly configured apiSuffix takes precedence over legacyTraverse.
+ * @returns {string} API traversal suffix.
+ */
+export function getApiSuffix() {
+  const { settings } = config;
+  return settings.apiSuffix ?? (settings.legacyTraverse ? '' : '/++api++');
+}
+
 /**
  * Given a URL expands it to the backend URL
  * Useful when you have to actually call the backend from the
@@ -193,7 +204,7 @@ export function addAppURL(url) {
  */
 export function expandToBackendURL(path) {
   const { settings } = config;
-  const apiSuffix = settings.legacyTraverse ? '' : '/++api++';
+  const apiSuffix = getApiSuffix();
   let adjustedPath;
   if (path.startsWith('http://') || path.startsWith('https://')) {
     // flattenToAppURL first if we get a full URL
diff --git a/packages/volto/src/helpers/Url/Url.test.js b/packages/volto/src/helpers/Url/Url.test.js
index 290c96276a5..c93eab967ac 100644
--- a/packages/volto/src/helpers/Url/Url.test.js
+++ b/packages/volto/src/helpers/Url/Url.test.js
@@ -24,6 +24,7 @@ import {
 } from './Url';
 
 beforeEach(() => {
+  config.settings.apiSuffix = undefined;
   config.settings.legacyTraverse = false;
 });
 
@@ -372,6 +373,20 @@ describe('Url', () => {
       const href = `https://plone.org/api/ca/my-page`;
       expect(expandToBackendURL(href)).toBe('https://plone.org/api/ca/my-page');
     });
+    it('uses apiSuffix in preference to legacyTraverse', () => {
+      settings.apiPath = 'https://plone.org/api';
+      settings.legacyTraverse = true;
+      settings.apiSuffix = '/custom-api';
+      const href = `https://plone.org/api/ca/my-page`;
+      expect(expandToBackendURL(href)).toBe(
+        'https://plone.org/api/custom-api/ca/my-page',
+      );
+    });
+    it('allows apiSuffix to disable the suffix', () => {
+      settings.apiSuffix = '';
+      const href = `/ca/my-page`;
+      expect(expandToBackendURL(href)).toBe('https://plone.org/api/ca/my-page');
+    });
     it('expandToBackendURL test full URL - deployed seamless', () => {
       settings.apiPath = 'https://plone.org';
       const href = `https://plone.org/ca/my-page`;
diff --git a/packages/volto/src/start-client.jsx b/packages/volto/src/start-client.jsx
index a7b05a19bcc..8e40efffbeb 100644
--- a/packages/volto/src/start-client.jsx
+++ b/packages/volto/src/start-client.jsx
@@ -77,6 +77,9 @@ export default function client() {
   if (window.env.RAZZLE_INTERNAL_API_PATH) {
     config.settings.internalApiPath = window.env.RAZZLE_INTERNAL_API_PATH;
   }
+  if (typeof window.env.RAZZLE_API_SUFFIX !== 'undefined') {
+    config.settings.apiSuffix = window.env.RAZZLE_API_SUFFIX;
+  }
   // TODO: To be removed when the use of the legacy traverse is deprecated.
   if (window.env.RAZZLE_LEGACY_TRAVERSE) {
     config.settings.legacyTraverse = true;