diff --git a/src/commands/base-command.ts b/src/commands/base-command.ts
index 8358ef06c2d..a4c467d7fd4 100644
--- a/src/commands/base-command.ts
+++ b/src/commands/base-command.ts
@@ -39,6 +39,7 @@ import { EXIT_CODES } from '../utils/exit-codes.js'
 import type { FeatureFlags } from '../utils/feature-flags.js'
 import { getFrameworksAPIPaths } from '../utils/frameworks-api.js'
 import { getSiteByName } from '../utils/get-site.js'
+import { getLocalApiTestOpts } from '../utils/local-api-test-opts.js'
 import { buildAuthorizeUrl } from '../utils/login-url.js'
 import openBrowser from '../utils/open-browser.js'
 import { isInteractive } from '../utils/scripted-commands.js'
@@ -845,6 +846,7 @@ export default class BaseCommand extends Command {
         host: host,
         pathPrefix: pathPrefix,
         scheme: scheme,
+        testOpts: getLocalApiTestOpts({ host, scheme }),
         offline: offline ?? flags.offline,
         siteFeatureFlagPrefix: 'cli',
         featureFlags: this.featureFlags,
diff --git a/src/utils/local-api-test-opts.ts b/src/utils/local-api-test-opts.ts
new file mode 100644
index 00000000000..2fa138fcb7a
--- /dev/null
+++ b/src/utils/local-api-test-opts.ts
@@ -0,0 +1,20 @@
+const LOOPBACK_HOSTNAMES = new Set(['localhost', '127.0.0.1', '[::1]'])
+
+export const getLocalApiTestOpts = ({
+  host,
+  scheme,
+}: {
+  host?: string
+  scheme?: string
+}): { host: string; scheme?: string } | undefined => {
+  if (host === undefined) {
+    return undefined
+  }
+
+  try {
+    const { hostname } = new URL(`http://${host}`)
+    return LOOPBACK_HOSTNAMES.has(hostname) ? { host, scheme } : undefined
+  } catch {
+    return undefined
+  }
+}
diff --git a/tests/integration/commands/dev/v2-api.test.ts b/tests/integration/commands/dev/v2-api.test.ts
index f0257274442..6585f5561f8 100644
--- a/tests/integration/commands/dev/v2-api.test.ts
+++ b/tests/integration/commands/dev/v2-api.test.ts
@@ -67,9 +67,7 @@ describe.concurrent('v2 api', async () => {
       expect(context).toHaveProperty('ip', expect.stringMatching(/::1|127\.0\.0\.1/))
       expect(context).toHaveProperty('geo.city', 'Mock City')
       expect(context).toHaveProperty('cookies', { foo: 'bar' })
-      // TODO: re-enable once the extensions API is mocked. The real one rejects this test's fake token,
-      // so config resolution falls back to offline and the account is unknown.
-      // expect(context).toHaveProperty('account.id', 'mock-account-id')
+      expect(context).toHaveProperty('account.id', 'mock-account-id')
       expect(context).toHaveProperty('deploy.context', 'dev')
       expect(context).toHaveProperty('deploy.id', '0')
       expect(context).toHaveProperty('deploy.published', false)
diff --git a/tests/integration/utils/mock-api-vitest.ts b/tests/integration/utils/mock-api-vitest.ts
index b99049d25a2..055afe82efc 100644
--- a/tests/integration/utils/mock-api-vitest.ts
+++ b/tests/integration/utils/mock-api-vitest.ts
@@ -84,6 +84,18 @@ export const startMockApi = ({ routes, silent }: MockApiOptions): Promise<MockAp
     )
   })
 
+  app.get('/site/:siteId/integrations/safe', function onRequest(req, res) {
+    addRequest(requests, req)
+    res.status(200)
+    res.json([])
+  })
+
+  app.get('/team/:accountId/integrations/installations/meta/:siteId', function onRequest(req, res) {
+    addRequest(requests, req)
+    res.status(200)
+    res.json([])
+  })
+
   app.all('{*splat}', function onRequest(req, res) {
     addRequest(requests, req)
     if (!silent) {
diff --git a/tests/integration/utils/mock-api.ts b/tests/integration/utils/mock-api.ts
index fcae01ffacf..b5346852f95 100644
--- a/tests/integration/utils/mock-api.ts
+++ b/tests/integration/utils/mock-api.ts
@@ -72,7 +72,7 @@ export const startMockApi = ({ routes, silent }: MockApiOptions): Promise<MockAp
     )
   })
 
-  app.get('/site/site_id/integrations/safe', function onRequest(req, res) {
+  app.get('/site/:siteId/integrations/safe', function onRequest(req, res) {
     if (process.env.DEBUG_TESTS) {
       console.debug('[mock-api] ', req.method, req.path, req.body)
     }
@@ -81,7 +81,7 @@ export const startMockApi = ({ routes, silent }: MockApiOptions): Promise<MockAp
     res.json([])
   })
 
-  app.get('/team/account_id/integrations/installations/meta/site_id', function onRequest(req, res) {
+  app.get('/team/:accountId/integrations/installations/meta/:siteId', function onRequest(req, res) {
     if (process.env.DEBUG_TESTS) {
       console.debug('[mock-api] ', req.method, req.path, req.body)
     }
diff --git a/tests/unit/utils/local-api-test-opts.test.ts b/tests/unit/utils/local-api-test-opts.test.ts
new file mode 100644
index 00000000000..aa2c08dd285
--- /dev/null
+++ b/tests/unit/utils/local-api-test-opts.test.ts
@@ -0,0 +1,41 @@
+import { describe, expect, test } from 'vitest'
+
+import { getLocalApiTestOpts } from '../../../src/utils/local-api-test-opts.js'
+
+describe('getLocalApiTestOpts', () => {
+  test('returns host and scheme for localhost', () => {
+    expect(getLocalApiTestOpts({ host: 'localhost:1234', scheme: 'http' })).toEqual({
+      host: 'localhost:1234',
+      scheme: 'http',
+    })
+  })
+
+  test('returns host and scheme for 127.0.0.1', () => {
+    expect(getLocalApiTestOpts({ host: '127.0.0.1:1234', scheme: 'http' })).toEqual({
+      host: '127.0.0.1:1234',
+      scheme: 'http',
+    })
+  })
+
+  test('returns host and scheme for [::1]', () => {
+    expect(getLocalApiTestOpts({ host: '[::1]:1234', scheme: 'http' })).toEqual({
+      host: '[::1]:1234',
+      scheme: 'http',
+    })
+  })
+
+  test.each(['api.netlify.com', 'api-staging.netlify.com', 'example.com:8080', 'localhost.example.com'])(
+    'returns undefined for non-loopback host %s',
+    (host) => {
+      expect(getLocalApiTestOpts({ host, scheme: 'https' })).toBeUndefined()
+    },
+  )
+
+  test('returns undefined when host is undefined', () => {
+    expect(getLocalApiTestOpts({ host: undefined, scheme: 'http' })).toBeUndefined()
+  })
+
+  test('returns undefined when host cannot be parsed', () => {
+    expect(getLocalApiTestOpts({ host: 'not a host', scheme: 'http' })).toBeUndefined()
+  })
+})