diff --git a/htdocs/societe/class/api_thirdparties.class.php b/htdocs/societe/class/api_thirdparties.class.php
index 535d4e68967..1efe6287c66 100644
--- a/htdocs/societe/class/api_thirdparties.class.php
+++ b/htdocs/societe/class/api_thirdparties.class.php
@@ -490,6 +490,66 @@ class Thirdparties extends DolibarrApi
 		}
         $this->company->oldcopy = clone $this->company;
 		return $this->company->delete($id);
+    }
+
+	/**
+	 * Set new price level for the given thirdparty
+	 *
+	 * @param	int		$id				ID of thirdparty
+	 * @param	int		$priceLevel		Price level to apply to thirdparty
+	 * @return	object					Thirdparty data without useless information
+	 *
+	 * @url PUT {id}/setpricelevel
+	 *
+	 * @throws RestException 400 Price level out of bounds
+	 * @throws RestException 401 Access not allowed for your login
+	 * @throws RestException 404 Thirdparty not found
+	 * @throws RestException 500 Error fetching/setting price level
+	 * @throws RestException 501 Request needs modules "Thirdparties" and "Products" and setting Multiprices activated
+	 */
+	public function setThirdpartyPriceLevel($id, $priceLevel)
+	{
+		global $conf;
+
+		if (empty($conf->societe->enabled)) {
+			throw new RestException(501, 'Module "Thirdparties" needed for this request');
+		}
+
+		if (empty($conf->product->enabled)) {
+			throw new RestException(501, 'Module "Products" needed for this request');
+		}
+
+		if (empty($conf->global->PRODUIT_MULTIPRICES)) {
+			throw new RestException(501, 'Multiprices features activation needed for this request');
+		}
+
+		if ($priceLevel < 1 || $priceLevel > $conf->global->PRODUIT_MULTIPRICES_LIMIT) {
+			throw new RestException(400, 'Price level must be between 1 and ' . $conf->global->PRODUIT_MULTIPRICES_LIMIT);
+		}
+
+		if (empty(DolibarrApiAccess::$user->rights->societe->creer)) {
+			throw new RestException(401, 'Access to thirdparty ' . $id . ' not allowed for login '. DolibarrApiAccess::$user->login);
+		}
+
+		$result = $this->company->fetch($id);
+		if ($result < 0) {
+			throw new RestException(404, 'Thirdparty ' . $id . ' not found');
+		}
+
+		if (empty($result)) {
+			throw new RestException(500, 'Error fetching thirdparty ' . $id, array_merge(array($this->company->error), $this->company->errors));
+		}
+
+		if (empty(DolibarrApi::_checkAccessToResource('societe', $this->company->id))) {
+			throw new RestException(401, 'Access to thirdparty ' . $id . ' not allowed for login ' . DolibarrApiAccess::$user->login);
+		}
+
+		$result = $this->company->set_price_level($priceLevel, DolibarrApiAccess::$user);
+		if ($result <= 0) {
+			throw new RestException(500, 'Error setting new price level for thirdparty ' . $id, array($this->company->db->lasterror()));
+		}
+
+		return $this->_cleanObjectDatas($this->company);
 	}
 
 	/**