diff --git a/common/locales/en/api-v3.json b/common/locales/en/api-v3.json
index afb7b17f00..fa635243e2 100644
--- a/common/locales/en/api-v3.json
+++ b/common/locales/en/api-v3.json
@@ -148,5 +148,6 @@
   "noSudoAccess": "You don't have sudo access.",
   "couponCodeRequired": "The coupon code is required.",
   "eventRequired": "\"req.params.event\" is required.",
-  "countRequired": "\"req.query.count\" is required."
+  "countRequired": "\"req.query.count\" is required.",
+  "petsReleased": "Pets released."
 }
diff --git a/common/script/index.js b/common/script/index.js
index ee7206f3b1..4b854c8306 100644
--- a/common/script/index.js
+++ b/common/script/index.js
@@ -118,6 +118,7 @@ import purchase from './ops/purchase';
 import purchaseHourglass from './ops/hourglassPurchase';
 import readCard from './ops/readCard';
 import openMysteryItem from './ops/openMysteryItem';
+import releasePets from './ops/releasePets';
 
 api.ops = {
   scoreTask,
@@ -137,6 +138,7 @@ api.ops = {
   purchaseHourglass,
   readCard,
   openMysteryItem,
+  releasePets,
 };
 
 import handleTwoHanded from './fns/handleTwoHanded';
diff --git a/common/script/ops/releasePets.js b/common/script/ops/releasePets.js
index a4b452cd86..12bb48a90f 100644
--- a/common/script/ops/releasePets.js
+++ b/common/script/ops/releasePets.js
@@ -1,32 +1,40 @@
 import content from '../content/index';
 import i18n from '../i18n';
+import {
+  NotAuthorized,
+} from '../libs/errors';
+import splitWhitespace from '../libs/splitWhitespace';
 
-module.exports = function(user, req, cb, analytics) {
-  var analyticsData, pet;
+module.exports = function releasePets (user, req = {}, analytics) {
   if (user.balance < 1) {
-    return typeof cb === "function" ? cb({
-      code: 401,
-      message: i18n.t('notEnoughGems', req.language)
-    }) : void 0;
-  } else {
-    user.balance -= 1;
-    for (pet in content.pets) {
-      user.items.pets[pet] = 0;
-    }
-    if (!user.achievements.beastMasterCount) {
-      user.achievements.beastMasterCount = 0;
-    }
-    user.achievements.beastMasterCount++;
-    user.items.currentPet = "";
+    throw new NotAuthorized(i18n.t('notEnoughGems', req.language));
   }
-  analyticsData = {
-    uuid: user._id,
-    acquireMethod: 'Gems',
-    gemCost: 4,
-    category: 'behavior'
+
+  user.balance -= 1;
+  user.items.currentPet = '';
+
+  for (let pet in content.pets) {
+    user.items.pets[pet] = 0;
+  }
+
+  if (!user.achievements.beastMasterCount) {
+    user.achievements.beastMasterCount = 0;
+  }
+  user.achievements.beastMasterCount++;
+
+  if (analytics) {
+    analytics.track('release pets', {
+      uuid: user._id,
+      acquireMethod: 'Gems',
+      gemCost: 4,
+      category: 'behavior'
+    });
+  }
+
+  let response = {
+    data: _.pick(user, splitWhitespace('user.items.pets')),
+    message: i18n.t('petsReleased'),
   };
-  if (analytics != null) {
-    analytics.track('release pets', analyticsData);
-  }
-  return typeof cb === "function" ? cb(null, user) : void 0;
+
+  return response;
 };
diff --git a/test/api/v3/integration/user/POST-user_release_pets.test.js b/test/api/v3/integration/user/POST-user_release_pets.test.js
new file mode 100644
index 0000000000..a7f7b9b66f
--- /dev/null
+++ b/test/api/v3/integration/user/POST-user_release_pets.test.js
@@ -0,0 +1,42 @@
+import {
+  generateUser,
+  translate as t,
+} from '../../../../helpers/api-integration/v3';
+
+describe('POST /user/release-pets', () => {
+  let user;
+  let animal = 'Wolf-Base';
+
+  beforeEach(async () => {
+    user = await generateUser({
+      'items.currentPet': animal,
+      'items.pets': {animal: 5},
+    });
+  });
+
+  it('returns an error when user balance is too low', async () => {
+    await expect(user.post('/user/release-pets'))
+      .to.eventually.be.rejected.and.to.eql({
+        code: 401,
+        error: 'NotAuthorized',
+        message: t('notEnoughGems'),
+      });
+  });
+
+  // More tests in common code unit tests
+
+  it('releases pets', async () => {
+    await user.update({
+      balance: 1,
+    });
+
+    let response = await user.post('/user/release-pets');
+    await user.sync();
+
+    expect(response.message).to.equal(t('petsReleased'));
+    expect(user.balance).to.equal(0);
+    expect(user.items.currentPet).to.be.empty;
+    expect(user.items.pets[animal]).to.equal(0);
+    expect(user.achievements.beastMasterCount).to.equal(1);
+  });
+});
diff --git a/test/common/ops/releasePets.js b/test/common/ops/releasePets.js
new file mode 100644
index 0000000000..11d69a5a31
--- /dev/null
+++ b/test/common/ops/releasePets.js
@@ -0,0 +1,57 @@
+import releasePets from '../../../common/script/ops/releasePets';
+import i18n from '../../../common/script/i18n';
+import {
+  generateUser,
+} from '../../helpers/common.helper';
+import {
+  NotAuthorized,
+} from '../../../common/script/libs/errors';
+
+describe('shared.ops.releasePets', () => {
+  let user;
+  let animal = 'Wolf-Base';
+
+  beforeEach(() => {
+    user = generateUser();
+    user.items.currentPet = animal;
+    user.items.pets[animal] = 5;
+    user.balance = 1;
+  });
+
+  it('returns an error when user balance is too low', (done) => {
+    user.balance = 0;
+
+    try {
+      releasePets(user);
+    } catch (err) {
+      expect(err).to.be.an.instanceof(NotAuthorized);
+      expect(err.message).to.equal(i18n.t('notEnoughGems'));
+      done();
+    }
+  });
+
+  it('releases pets', () => {
+    let response = releasePets(user);
+
+    expect(response.message).to.equal(i18n.t('petsReleased'));
+    expect(user.items.pets[animal]).to.equal(0);
+  });
+
+  it('removes currentPet', () => {
+    releasePets(user);
+
+    expect(user.items.currentPet).to.be.empty;
+  });
+
+  it('decreases user\'s balance', () => {
+    releasePets(user);
+
+    expect(user.balance).to.equal(0);
+  });
+
+  it('incremenets beastMasterCount', () => {
+    releasePets(user);
+
+    expect(user.achievements.beastMasterCount).to.equal(1);
+  });
+});
diff --git a/website/src/controllers/api-v3/user.js b/website/src/controllers/api-v3/user.js
index 49d2f2f05d..7b7cf3dd57 100644
--- a/website/src/controllers/api-v3/user.js
+++ b/website/src/controllers/api-v3/user.js
@@ -764,4 +764,24 @@ api.userOpenMysteryItem = {
   },
 };
 
+/**
+* @api {post} /user/release-pets Releases pets.
+* @apiVersion 3.0.0
+* @apiName UserReleasePets
+* @apiGroup User
+*
+* @apiSuccess {Object} data `user.items.pets`
+*/
+api.userReleasePets = {
+  method: 'POST',
+  middlewares: [authWithHeaders(), cron],
+  url: '/user/release-pets',
+  async handler (req, res) {
+    let user = res.locals.user;
+    let releasePetsResponse = common.ops.releasePets(user, req, res.analytics);
+    await user.save();
+    res.respond(200, releasePetsResponse);
+  },
+};
+
 module.exports = api;