Regarding my previous comment about Lynx: I got more into options trading and found out Lynx has double the commissions of IBKR. So I've opened an account with IBKR (UK) directly. Everything is the same, even the bank account in Frankfurt at Citi is the same. Just instead of Lynx Basic there's WebTrader. Contrary to what someone here wrote, there was no problem at all with opening the account directly with IBKR, Lynx didn't make any problems at all.