Maybe. But misunderstandings are rife, and especially different brokers (among the ones who talk in terms of “units”) can use that term differently.
But first: welcome to the forum!
In a sense, that could end the conversation, right there. But that would come across as both rude and unhelpful, so we’ll doubtless try to do better.
The big important point (and it’s really a hugely important one, that eclipses everything else you’ve mentioned and asked about) is that a broker offering 1:200 leverage cannot, by definition, be properly regulated, for the very simple and vitally significant reason that proper regulators aren’t allowed, by law, to regulate brokers offering that level of leverage.
So that means the broker is either unregulated (in which case run a mile) or “regulated” by a non-proper regulator (in which case still run a mile) of the type you get on Caribbean/Pacific island nations where dodgy/corrupt “financial services” are part of the local industry, and there are plenty of “regulators” who will pretend to regulate forex brokers in exchange for a larger-than-normal annual fee, the understanding being that under no circumstances will those “regulators” ever rule against their customer-broker, in the event of a dispute.
And - surprise, surprise - those are the brokers whose customers have all the disputes.
So that kind of settles it, really. Or ought to.
This “10,000 units” you mention probably means 0.1 lots, I’m guessing? When you’re trading a dollar pair (like GBP/USD or EUR/USD or AUD/USD), where the USD is the quote currency, “1 lot” means $100,000. (This doesn’t apply to other pairs). So 10,000 units is probably a tenth of a lot, or 0.1 lots.
If the spread for that is $0.30, that’s a low and very acceptable spread, for a commission-free broker. Is that a fixed spread, or does it vary?
I think what you’ve missed is the “regulation” question.
This is cool … and presumably you can do that with a real, regulated broker?
Well, maybe …
The key point to appreciate, in that context, is that when you “trade forex” you’re not really trading, and no currencies change hands. So the party being “scalped” is actually your broker! (Are they going to like that? Are they going to let you do it long term? Will there be a “dispute” about it? Maybe you can start to see one of the reasons why regulation is so crucially important?).
These few posts/threads may interest you (at least I hope they will!). Just click on the words in green, in each case.