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@TrustyJules If you plan for very active multi-legged option trading, with frequent adjustments, it should be noted that on the PureVolatility forums, where such trading is done, they recommend one of Tradier, TastyWorks, EOption OR RobinHood rather than Interactive Brokers, it looks like IB's commissions are still too high for very active option trading. Unfortunately, as far as I can see, only TastyWorks out of these four accepts customers from Belgium. You might be interested in their capped commissions program, too: https://tastyworks.desk.com/customer/en/portal/articles/2802397-international-accounts https://tastyworks.com/pricing.html#capComm I personally have an IB account and am pleased with their service so far.

IB is very big, and covers a lot of financial instruments, and niche areas as well. They clear multi billion dollar hedge funds. Tastyworks, and Tradier, are good, but they just cover the kind of niche area of the market that SO type trading involves, which can be very commission intensive. I like to trade many other products that are not talked about here (sugar, crude, and others), and, with IB, if I have a thought about almost anything in the world, I can pull up charts, and options chains, and all sorts of analysis, about whatever comes to my mind. Like ,what is the IV skew in Crude oil, or Natural Gas ....they cover so much territory, and their commissions can be very competitive with anyone else. You really get quite alot for your money

You can take a look at this trade as well : https://steadyoptions.com/forums/forum/topic/420-trading-form-netherlands/?do=findComment&comment=80126 It seems that for european customers, depending on the country there are : IB, TastyWorks, Tradier. I'm based in the US so i can't help more than that (i'm using IB, but i have a Tastyworks account as well that i don't use). Many on SO forum are on one of those 3 brokers (IB, TastyWorks, Tradier). One thing that could be of interest to you is that you can buy shares/ETF in non-US exchanges as well with IB.

I have been with IB since they first started, and from all I know, they seem like what you are looking for. But, I haven't looked into the particulars of whether there are any countries that cannot open an account. I just went to their website, and typed in "foreign accounts", but it didn't give me what I was looking for.