Gas is the fee Ethereum charges to process a transaction, and confirmations are the blocks that settle it. Whether either one touches your roulette spins depends on where the table lives. At a casino site, your deposit and withdrawal pay gas and wait for confirmations, but the spins in between run on the casino’s own ledger and cost nothing to place. At an on-chain table run by a smart contract, every spin is its own transaction, so every spin pays gas and waits for a block. Knowing which type of table you are at tells you what each spin costs. Here is how gas and confirmations work in crypto roulette on Ethereum, and what to watch before you sit down.
How is gas priced?
A gas fee has two parts. The network sets the base fee and raises it when blocks are full. The priority fee is a tip you add to be included sooner. Both are quoted in gwei, a billionth of an ether, and multiplied by the work your transaction needs. A plain transfer of ether to a casino’s deposit address uses 21,000 units of gas. At a quiet time, with a base fee of 10 gwei, that costs a few pence. At a busy time with a base fee of 100 gwei, the same transfer costs a pound or two.
What confirmations do you have for your deposit?
Ethereum produces a block every twelve seconds. Once your deposit transaction is in a block, the casino counts confirmations until it reaches its threshold, often between six and twelve. Twelve confirmations are about two and a half minutes. Some casinos wait for finality instead, which takes around fifteen minutes. Until the threshold is met, the deposit shows as pending and cannot be wagered. Send it before you settle in.
Spins at a casino site
Once your balance is credited, gas stops mattering. Each bet moves a number in the casino’s database. The balance updates and the next spin are ready in seconds with nothing sent to the chain. You can play a hundred spins for a total network cost of zero. Gas returns only when you withdraw. The casino’s wallet pays the fee to send ether back to you, and some deduct it from the amount or charge a flat withdrawal fee to cover it. Check the withdrawal page for the current figure.
Spins at an on-chain table
A smart contract roulette table works differently. Placing a bet means calling the contract, which is a transaction. It pays gas, waits for a block, and the result is written on-chain. Because the contract does more work than a plain transfer, the gas used per spin is higher, often between 100,000 and 200,000 units. At a base fee of 30 gwei, that is a few pounds per spin. Confirmations apply too. The result is not final until the block that holds it is confirmed, so each spin takes at least twelve seconds and usually longer. Layer 2 networks built on Ethereum cut both the fee and the wait by batching transactions, which is why many on-chain tables now run there rather than on the main chain.
Reading the cost before you play
At a casino site, count gas twice, once in and once out, and treat the spins as free. At an on-chain table, add gas to every stake and check the network’s base fee before you start, because a busy hour can double what each spin costs. Your wallet shows the number before you confirm, and a glance at it keeps the fee from surprising you.
