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An accountless swap is nothing more than a well-organised pair of on-chain transfers. You tell a provider what you are sending and where the output should land, it gives you a deposit address that exists only for that swap, and once your deposit confirms it broadcasts the payout. No balance is ever parked under your name, because there is no name.
The cost is entirely inside the quote. A provider's spread and the network fee for the payout are baked into the number you are shown, which is why the only figure worth comparing is the amount you would actually receive. Comparing eighteen quotes for the same pair at the same second turns an abstract 'good rate' into a concrete difference you can read off the screen.
Three checks before you send. First, the network: USDT on Tron and USDT on Ethereum are different assets from the wallet's point of view. Second, the destination address, compared character by character at both ends against your own wallet, on your own screen. Third, the minimum for that pair — a deposit below it can be stranded rather than refunded automatically.
Save the swap ID. It is the one piece of information that lets anyone reconstruct what happened, and it is the first thing support will ask for.