Hi,
Well, there kind of is. But there is no documentation about it.
You can load the HikaShop main helper, then initiliaze the address model, populate an object, and save it:
if(!defined('DS'))
define('DS',DIRECTORY_SEPARATOR);
if(!include_once(rtrim(JPATH_ADMINISTRATOR,DS).DS.'components'.DS.'com_hikashop'.DS.'helpers'.DS.'helper.php'))
return true;
$addressClass = hikashop_get('class.address');
$address = new stdClass();
$address->address_user_id = hikashop_loadUser();
$address->addres_firstname = $my_firstname;
$address->addres_lastname = $my_lastname;
$address->addres_city = $my_city;
.....
$addressClass->save($address);