API still incomplete, you can only see account info and configure workers with it:
https://hash-to-coins.com/index.php?page=api&action=getuserhashrate&api_key=_USER_API_KEY_
https://hash-to-coins.com/index.php?page=api&action=getuserworkersinfo&api_key=_USER_API_KEY_
https://hash-to-coins.com/index.php?page=api&action=getuserbalances&api_key=_USER_API_KEY_
https://hash-to-coins.com/index.php?page=api&action=getnetworksinfo&api_key=_USER_API_KEY_
https://hash-to-coins.com/index.php?page=api&action=setworkercurrency&api_key=_USER_API_KEY_&worker=_WORKER_NAME_&coin=_COIN_TAG_
The only way to automate withdrawals is set up autopayout by a threshold