diff --git a/core/controllers/api/ItemController.php b/core/controllers/api/ItemController.php
index cc2209b58..fc7dff9aa 100644
--- a/core/controllers/api/ItemController.php
+++ b/core/controllers/api/ItemController.php
@@ -95,6 +95,7 @@ public function putAction()
             'removepolicyuser' => 'itemRemovePolicyuser',
             'setmetadata' => 'itemSetmetadata',
             'setmultiplemetadata' => 'itemSetmultiplemetadata',
+            'addmetadata' => 'itemAddmetadata',
             'deletemetadata' => 'itemDeletemetadata',
             'deletemetadataall' => 'itemDeletemetadataAll',
         );
diff --git a/core/controllers/components/ApiitemComponent.php b/core/controllers/components/ApiitemComponent.php
index 215523f21..519d148ff 100644
--- a/core/controllers/components/ApiitemComponent.php
+++ b/core/controllers/components/ApiitemComponent.php
@@ -170,6 +170,71 @@ public function itemSetmultiplemetadata($args)
         return true;
     }
 
+    /**
+     * Set multiple metadata fields on an item, will overwrite any existing metadatum with
+     * the new value; requires passing the metadata in the request body as JSON
+     * with a key of 'metadata' mapping to a list; each element of the 'metadata' list is
+     * a metadatum on the item; each metadatum requires an 'element' and 'value' key, with
+     * 'qualifier' and 'type' being optional keys on the metadatum, 'type' defaults to MIDAS_METADATA_TEXT.
+     * @path /item/addmetadata/{id}
+     * @http PUT
+     * @param id The id of the item
+     * @param revision (Optional) Item Revision number to set metadata on, defaults to latest revision.
+     * @return true on success,
+     *              will fail if there are no revisions or the specified revision is not found.
+     *
+     * @param array $args parameters
+     * @throws Exception
+     */
+    public function itemAddmetadata($args)
+    {
+        /** @var ApihelperComponent $apihelperComponent */
+        $apihelperComponent = MidasLoader::loadComponent('Apihelper');
+        $apihelperComponent->validateParams($args, array('id'));
+        $userDao = $apihelperComponent->getUser($args);
+
+        $apihelperComponent->requirePolicyScopes(array(MIDAS_API_PERMISSION_SCOPE_WRITE_DATA));
+
+        /** @var ItemModel $itemModel */
+        $itemModel = MidasLoader::loadModel('Item');
+        $item = $itemModel->load($args['id']);
+        if ($item === false || !$itemModel->policyCheck($item, $userDao, MIDAS_POLICY_WRITE)) {
+            throw new Exception("This item doesn't exist or you don't have write permission.", MIDAS_INVALID_POLICY);
+        }
+        $revisionNumber = array_key_exists('revision', $args) ? (int) $args['revision'] : null;
+        $revision = $apihelperComponent->getItemRevision($item, $revisionNumber);
+
+        if (!array_key_exists(0, $args)) {
+            throw new Exception("Missing request body data.", MIDAS_INVALID_PARAMETER);
+        }
+        $json_body = json_decode($args[0]);
+        if (NULL === $json_body) {
+            throw new Exception("Request body data must be valid JSON.", MIDAS_INVALID_PARAMETER);
+        }
+        if (!array_key_exists('metadata', $json_body)) {
+            throw new Exception("Request body data missing key 'metadata'.", MIDAS_INVALID_PARAMETER);
+        }
+        $metadata = $json_body->metadata;
+        foreach ($metadata as $metadatum) {
+            if (!isset($metadatum->element) || !isset($metadatum->value)) {
+                throw new Exception("All metadata must have 'element' and 'value' keys.", MIDAS_INVALID_PARAMETER);
+            }
+        }
+
+        foreach ($metadata as $metadatum) {
+            $apihelperComponent->setMetadata(
+                $item,
+                isset($metadatum->type) ? $metadatum->type : MIDAS_METADATA_TEXT,
+                $metadatum->element,
+                isset($metadatum->qualifier) ? $metadatum->qualifier : '',
+                $metadatum->value,
+                $revision
+            );
+        }
+
+        return true;
+    }
+
     /**
      * Delete a metadata tuple (element, qualifier, type) from a specific item revision,
      * defaults to the latest revision of the item.
diff --git a/core/tests/controllers/api/CMakeLists.txt b/core/tests/controllers/api/CMakeLists.txt
index 53ceff6b9..543970c59 100644
--- a/core/tests/controllers/api/CMakeLists.txt
+++ b/core/tests/controllers/api/CMakeLists.txt
@@ -19,3 +19,4 @@
 
 add_midas_test(CoreRestCallUserMethodsTest RestCallUserMethodsTest.php)
 add_midas_test(CoreRestKeyControllerTest RestKeyControllerTest.php)
+add_midas_test(CoreRestCallItemMethodsTest RestCallItemMethodsTest.php)
diff --git a/core/tests/controllers/api/RestCallItemMethodsTest.php b/core/tests/controllers/api/RestCallItemMethodsTest.php
new file mode 100644
index 000000000..9259689bd
--- /dev/null
+++ b/core/tests/controllers/api/RestCallItemMethodsTest.php
@@ -0,0 +1,132 @@
+<?php
+/*=========================================================================
+ Midas Server
+ Copyright Kitware SAS, 26 rue Louis Guérin, 69100 Villeurbanne, France.
+ All rights reserved.
+ For more information visit http://www.kitware.com/.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0.txt
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+=========================================================================*/
+
+require_once BASE_PATH.'/core/tests/controllers/api/RestCallMethodsTestCase.php';
+
+/** Tests the functionality of the web API Rest Item methods */
+class Core_RestCallItemMethodsTest extends RestCallMethodsTestCase
+{
+    /** set up tests */
+    public function setUp()
+    {
+        parent::setUp();
+    }
+
+    /** Set metadata on the item. */
+    public function testItemAddmetadata()
+    {
+        $itemsFile = $this->loadData('Item', 'default');
+        $itemDao = $this->Item->load($itemsFile[1]->getKey());
+
+        $apipath = '/item/addmetadata/' . $itemDao->getItemId();
+
+        // No user will fail.
+        $this->resetAll();
+        $resp = $this->_callRestApi('PUT', $apipath);
+        $this->_assertStatusFail($resp);
+
+        $usersFile = $this->loadData('User', 'default');
+        $userDao = $this->User->load($usersFile[0]->getKey());
+
+        // Lack of request body will fail.
+        $this->resetAll();
+        $this->params['useSession'] = 'true';
+        $resp = $this->_callRestApi('PUT', $apipath, $userDao);
+        $this->_assertStatusFail($resp);
+
+        // Request body without a 'metadata' key will fail.
+        $this->resetAll();
+        $this->params['useSession'] = 'true';
+        $this->params[0] = json_encode(array('murkydata' => array()));
+        $resp = $this->_callRestApi('PUT', $apipath, $userDao);
+        $this->_assertStatusFail($resp);
+
+        // Metadatum needs 'value' key.
+        $this->resetAll();
+        $this->params['useSession'] = 'true';
+        $this->params[0] = json_encode(array('metadata' => array('element' => 'key1')));
+        $resp = $this->_callRestApi('PUT', $apipath, $userDao);
+        $this->_assertStatusFail($resp);
+
+        // Metadatum needs 'element' key.
+        $this->resetAll();
+        $this->params['useSession'] = 'true';
+        $this->params[0] = json_encode(array('metadata' => array('value' => 'val1')));
+        $resp = $this->_callRestApi('PUT', $apipath, $userDao);
+        $this->_assertStatusFail($resp);
+
+        // Write some metadata correctly.
+        $this->resetAll();
+        $this->params['useSession'] = 'true';
+        $this->params[0] = json_encode(array('metadata' => array(
+            array('element' => 'key1', 'value' => 'val1'),
+            array('element' => 'key2', 'value' => 'val2')
+        )));
+        $resp = $this->_callRestApi('PUT', $apipath, $userDao);
+        $this->_assertStatusOk($resp);
+
+        /** @var ItemModel $itemModel */
+        $itemModel = MidasLoader::loadModel('Item');
+        $revisionDao = $itemModel->getLastRevision($itemDao);
+        /** @var ItemRevisionModel $itemRevisionModel */
+        $itemRevisionModel = MidasLoader::loadModel('ItemRevision');
+        $metadata = $itemRevisionModel->getMetadata($revisionDao);
+        $metadataArray = array();
+        $key1 = false;
+        $key2 = false;
+        foreach ($metadata as $metadatum) {
+            if ($metadatum->element === 'key1' && $metadatum->value === 'val1') {
+                $key1 = true;
+            }
+            if ($metadatum->element === 'key2' && $metadatum->value === 'val2') {
+                $key2 = true;
+            }
+        }
+        $this->assertTrue($key1 && $key2, 'Metadata incorrectly set');
+
+        // Update key1, add key3, leave key2 alone.
+        $this->resetAll();
+        $this->params['useSession'] = 'true';
+        $this->params[0] = json_encode(array('metadata' => array(
+            array('element' => 'key1', 'value' => 'newval1'),
+            array('element' => 'key3', 'value' => 'val3')
+        )));
+        $resp = $this->_callRestApi('PUT', $apipath, $userDao);
+        $this->_assertStatusOk($resp);
+
+        $metadata = $itemRevisionModel->getMetadata($revisionDao);
+        $metadataArray = array();
+        $key1 = false;
+        $key2 = false;
+        $key3 = false;
+        foreach ($metadata as $metadatum) {
+            if ($metadatum->element === 'key1' && $metadatum->value === 'newval1') {
+                $key1 = true;
+            }
+            if ($metadatum->element === 'key2' && $metadatum->value === 'val2') {
+                $key2 = true;
+            }
+            if ($metadatum->element === 'key3' && $metadatum->value === 'val3') {
+                $key3 = true;
+            }
+        }
+        $this->assertTrue($key1 && $key2 && $key3, 'Metadata incorrectly set');
+    }
+}
diff --git a/modules/api/controllers/components/ApiComponent.php b/modules/api/controllers/components/ApiComponent.php
index a937bb7a2..8c6b67a03 100644
--- a/modules/api/controllers/components/ApiComponent.php
+++ b/modules/api/controllers/components/ApiComponent.php
@@ -767,6 +767,28 @@ public function itemSetmultiplemetadata($args)
         return $this->_callCoreApiMethod($args, 'itemSetmultiplemetadata', 'item');
     }
 
+    /**
+     * Set multiple metadata fields on an item, will overwrite any existing metadatum with
+     * the new value; requires passing the metadata in the request body as JSON
+     * with a key of 'metadata' mapping to a list; each element of the 'metadata' list is
+     * a metadatum on the item; each metadatum requires an 'element' and 'value' key, with
+     * 'qualifier' and 'type' being optional keys on the metadatum, 'type' defaults to MIDAS_METADATA_TEXT.
+     *
+     * @param token Authentication token
+     * @param itemid The id of the item
+     * @param revision (Optional) Item Revision number to set metadata on, defaults to latest revision.
+     * @return true on success,
+     *              will fail if there are no revisions or the specified revision is not found.
+     */
+    public function itemAddmetadata($args)
+    {
+        /** @var ApihelperComponent $ApihelperComponent */
+        $ApihelperComponent = MidasLoader::loadComponent('Apihelper');
+        $ApihelperComponent->renameParamKey($args, 'itemid', 'id');
+
+        return $this->_callCoreApiMethod($args, 'itemAddmetadata', 'item');
+    }
+
     /**
      * Delete a metadata tuple (element, qualifier, type) from a specific item revision,
      * defaults to the latest revision of the item.