Ok so pretty much you Buying and selling percentages of bitcoins ? Like you can buy 300 US dollars worth of bitcoin and only receive .0363 of a damn bitcoin? Shit is so sketchy I just don't understand
Yeah that's it but a source will only ask for 300 worth or whatever your order is. As soon as it's sent it could go up or down so it's up to them to either convert it back into currency or leave it as BTC. So a source will only ever receive what you sent them. The fluctuations have no effect really on sending money only if your holding money.
Think of it like a token you buy with cash and exchange for goods. What happens the token after is up to the receiver