diff --git a/common/locales/en/api-v3.json b/common/locales/en/api-v3.json
index b96fa01694..5ab3b3399e 100644
--- a/common/locales/en/api-v3.json
+++ b/common/locales/en/api-v3.json
@@ -150,5 +150,6 @@
   "eventRequired": "\"req.params.event\" is required.",
   "countRequired": "\"req.query.count\" is required.",
   "petsReleased": "Pets released.",
-  "mountsAndPetsReleased": "Mounts and pets released"
+  "mountsAndPetsReleased": "Mounts and pets released",
+  "mountsReleased": "Mounts released"
 }
diff --git a/common/script/index.js b/common/script/index.js
index 019dcef817..7482a09fd7 100644
--- a/common/script/index.js
+++ b/common/script/index.js
@@ -120,6 +120,7 @@ import readCard from './ops/readCard';
 import openMysteryItem from './ops/openMysteryItem';
 import releasePets from './ops/releasePets';
 import releaseBoth from './ops/releaseBoth';
+import releaseMounts from './ops/releaseMounts';
 
 api.ops = {
   scoreTask,
@@ -141,6 +142,7 @@ api.ops = {
   openMysteryItem,
   releasePets,
   releaseBoth,
+  releaseMounts,
 };
 
 import handleTwoHanded from './fns/handleTwoHanded';
diff --git a/common/script/ops/releaseMounts.js b/common/script/ops/releaseMounts.js
index 4aefab6b40..55d2c23fcb 100644
--- a/common/script/ops/releaseMounts.js
+++ b/common/script/ops/releaseMounts.js
@@ -1,32 +1,42 @@
 import content from '../content/index';
 import i18n from '../i18n';
+import {
+  NotAuthorized,
+} from '../libs/errors';
+import splitWhitespace from '../libs/splitWhitespace';
+
+module.exports = function releaseMounts (user, req = {}, analytics) {
+  let mount;
 
-module.exports = function(user, req, cb, analytics) {
-  var analyticsData, mount;
   if (user.balance < 1) {
-    return typeof cb === "function" ? cb({
-      code: 401,
-      message: i18n.t('notEnoughGems', req.language)
-    }) : void 0;
-  } else {
-    user.balance -= 1;
-    user.items.currentMount = "";
-    for (mount in content.pets) {
-      user.items.mounts[mount] = null;
-    }
-    if (!user.achievements.mountMasterCount) {
-      user.achievements.mountMasterCount = 0;
-    }
-    user.achievements.mountMasterCount++;
+    throw new NotAuthorized(i18n.t('notEnoughGems', req.language));
   }
-  analyticsData = {
-    uuid: user._id,
-    acquireMethod: 'Gems',
-    gemCost: 4,
-    category: 'behavior'
+
+  user.balance -= 1;
+  user.items.currentMount = '';
+
+  for (mount in content.pets) {
+    user.items.mounts[mount] = null;
+  }
+
+  if (!user.achievements.mountMasterCount) {
+    user.achievements.mountMasterCount = 0;
+  }
+  user.achievements.mountMasterCount++;
+
+  if (analytics) {
+    analytics.track('release mounts', {
+      uuid: user._id,
+      acquireMethod: 'Gems',
+      gemCost: 4,
+      category: 'behavior'
+    });
+  }
+
+  let response = {
+    data: _.pick(user, splitWhitespace('mounts')),
+    message: i18n.t('mountsReleased'),
   };
-  if (analytics != null) {
-    analytics.track('release mounts', analyticsData);
-  }
-  return typeof cb === "function" ? cb(null, user) : void 0;
+
+  return response;
 };
diff --git a/test/api/v3/integration/user/POST-user_release_mounts.test.js b/test/api/v3/integration/user/POST-user_release_mounts.test.js
new file mode 100644
index 0000000000..86391599f0
--- /dev/null
+++ b/test/api/v3/integration/user/POST-user_release_mounts.test.js
@@ -0,0 +1,42 @@
+import {
+  generateUser,
+  translate as t,
+} from '../../../../helpers/api-integration/v3';
+
+describe('POST /user/release-mounts', () => {
+  let user;
+  let animal = 'Wolf-Base';
+
+  beforeEach(async () => {
+    user = await generateUser({
+      'items.currentMount': animal,
+      'items.mounts': {animal: true},
+    });
+  });
+
+  it('returns an error when user balance is too low', async () => {
+    await expect(user.post('/user/release-mounts'))
+      .to.eventually.be.rejected.and.to.eql({
+        code: 401,
+        error: 'NotAuthorized',
+        message: t('notEnoughGems'),
+      });
+  });
+
+  // More tests in common code unit tests
+
+  it('releases mounts', async () => {
+    await user.update({
+      balance: 1,
+    });
+
+    let response = await user.post('/user/release-mounts');
+    await user.sync();
+
+    expect(response.message).to.equal(t('mountsReleased'));
+    expect(user.balance).to.equal(0);
+    expect(user.items.currentMount).to.be.empty;
+    expect(user.items.mounts[animal]).to.equal(null);
+    expect(user.achievements.mountMasterCount).to.equal(1);
+  });
+});
diff --git a/test/common/ops/releaseMounts.js b/test/common/ops/releaseMounts.js
new file mode 100644
index 0000000000..80429b726f
--- /dev/null
+++ b/test/common/ops/releaseMounts.js
@@ -0,0 +1,57 @@
+import releaseMounts from '../../../common/script/ops/releaseMounts';
+import i18n from '../../../common/script/i18n';
+import {
+  generateUser,
+} from '../../helpers/common.helper';
+import {
+  NotAuthorized,
+} from '../../../common/script/libs/errors';
+
+describe('shared.ops.releaseMounts', () => {
+  let user;
+  let animal = 'Wolf-Base';
+
+  beforeEach(() => {
+    user = generateUser();
+    user.items.currentMount = animal;
+    user.items.mounts[animal] = true;
+    user.balance = 1;
+  });
+
+  it('returns an error when user balance is too low', (done) => {
+    user.balance = 0;
+
+    try {
+      releaseMounts(user);
+    } catch (err) {
+      expect(err).to.be.an.instanceof(NotAuthorized);
+      expect(err.message).to.equal(i18n.t('notEnoughGems'));
+      done();
+    }
+  });
+
+  it('releases mounts', () => {
+    let response = releaseMounts(user);
+
+    expect(response.message).to.equal(i18n.t('mountsReleased'));
+    expect(user.items.mounts[animal]).to.equal(null);
+  });
+
+  it('removes currentMount', () => {
+    releaseMounts(user);
+
+    expect(user.items.currentMount).to.be.empty;
+  });
+
+  it('increases mountMasterCount achievement', () => {
+    releaseMounts(user);
+
+    expect(user.achievements.mountMasterCount).to.equal(1);
+  });
+
+  it('subtracts gems from balance', () => {
+    releaseMounts(user);
+
+    expect(user.balance).to.equal(0);
+  });
+});
diff --git a/website/src/controllers/api-v3/user.js b/website/src/controllers/api-v3/user.js
index ec21c36d0b..445c72d34e 100644
--- a/website/src/controllers/api-v3/user.js
+++ b/website/src/controllers/api-v3/user.js
@@ -804,4 +804,24 @@ api.userReleaseBoth = {
   },
 };
 
+/*
+* @api {post} /user/release-mounts Released mounts.
+* @apiVersion 3.0.0
+* @apiName UserReleaseMounts
+* @apiGroup User
+*
+* @apiSuccess {Object} data `mounts`
+*/
+api.userReleaseMounts = {
+  method: 'POST',
+  middlewares: [authWithHeaders(), cron],
+  url: '/user/release-mounts',
+  async handler (req, res) {
+    let user = res.locals.user;
+    let releaseMountsResponse = common.ops.releaseMounts(user, req, res.analytics);
+    await user.save();
+    res.respond(200, releaseMountsResponse);
+  },
+};
+
 module.exports = api;