A cross-chain swap inside a casino cashier is priced from an exchange rate, a spread the site adds on top, a network fee for the chain the new coin lives on, and a size adjustment for larger amounts. The four are combined into one quote that the cashier shows before you confirm, usually held for thirty to sixty seconds. Nothing about the quote is hidden, but the four parts are folded into a single number, and pulling them apart shows where the cost sits.
The example below swaps 100 dollars of bitcoin held on the casino ledger into USDT on Tron, a common move for players who want to take the price out of a session. The method is the same at most crypto roulette sites, and the figures are typical of a quiet afternoon.
- The reference rate – The cashier pulls the current bitcoin price from one or more exchanges, usually the midpoint between the best buy and sell orders. This is the rate you would see on a price site. At the moment of the quote, say bitcoin is 60,000 dollars, so 100 dollars is 0.001667 bitcoin. Cost: zero. This is the fair value; the rest is built on it.
- The spread – The site adds a margin to the reference rate to cover its own risk of the price moving before it hedges, and as its fee for the service. Typical spreads run from 0.1 per cent on major pairs at large sites to 1 per cent on smaller coins or at smaller sites. At 0.5 per cent, the 100 dollars becomes 99.50 dollars of USDT. Cost: 50 cents.
- The network fee – If the swap only changes the coin on the ledger, there is no network fee, because nothing moves on a chain. If the swap is bundled with a withdrawal, the fee for the destination chain is deducted for USDT on Tron, which is a few cents to a couple of dollars. In this example, the swap is on-ledger, and the player withdraws later, so the fee here is zero, and the tron fee applies at withdrawal.
- The size adjustment – For amounts large enough to move the market when the site hedges, the quote widens. On most sites, this begins above a few thousand dollars and is stated as a slightly worse rate rather than a separate line. At 100 dollars, it is zero.
Adding the four parts, 100 dollars of bitcoin becomes 99.50 dollars of USDT on the ledger, and the quote is good for about a minute. Let it lapse, and the cashier refreshes it at the new reference rate, which may be higher or lower, with the same 0.5 per cent spread on top.
Two comparisons show whether the price is fair. An exchange charges a trading fee of 0.1 to 0.5 per cent plus a withdrawal fee, and takes fifteen to thirty minutes to send the coins back to the casino, so an in-cashier swap at 0.5 per cent is level on cost and far ahead on time. A bridge costs a network fee on both sides and takes minutes to days, so for anything under a few hundred dollars, the swap is cheaper.
Verdict: read the spread. It is the only part of the quote the site controls; it is stated in the cashier’s swap terms, and at 0.5 per cent or under, the swap is the cheapest way to change coins without leaving the table.