Welcome.
There are hundreds of brokers where you can open an account with $200. That doesn’t mean you should.
What matters is that you’ll need a broker with nearly infinite “granularity,” as it’s called, because $200 isn’t really enough to trade a microlot (0.01 lots) safely, though $250 to $300 probably would be.
But that doesn‘t really matter because there are brokers like Oanda (a pretty good one) where you can trade position-sizes much smaller than 0.01 lots.
Just make sure of 3 things:
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it’s $200 you can afford to lose (we all lost our initial small deposit!)
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it’s the same broker you’ll want to stick with later, with more experience, to grow your account (so you only need one “practical learning process” rather than two)
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your account with the broker is regulated by a proper regulator (that means the UK’s FCA, or Australia’s ASIC or the US’s CFTC/NFA or a proper regulator in an EU country, meaning not Bulgaria Cyprus or Malta). This is definitely and always the single most important thing to know and act on, because if you get this right, then you’re protected from most of the potential problems ahead anyway. Good luck.