A crypto exchanger rarely charges just one fee. What you pay is the difference between the market value of what you send and the market value of what you receive, and that difference has up to five parts: a markup built into the rate, sometimes a separate service fee, the network fee for sending you the payout, the network fee you pay to send your coins, and a withdrawal fee if you send from an exchange account. The fair way to compare exchangers is therefore the final amount you receive for the same input, not the advertised percentage.
The five parts of the cost
| Part | Who charges it | Shown where | How to reduce it |
|---|---|---|---|
| Rate markup (spread) | The exchanger | Hidden in the rate | Compare the rate with a market reference |
| Separate service fee | Some exchangers | As a line in the form, if at all | Count it, even if it looks small |
| Payout network fee | The blockchain, passed on by the exchanger | Usually included in the receive amount | Pick a cheaper payout network |
| Your sending fee | The blockchain | In your wallet when you sign | Send from a cheap network; set a sensible fee rate |
| Exchange withdrawal fee | Your exchange, if you send from there | In the exchange's withdrawal screen | Send from a self-custody wallet instead |
The first three end up in the receive estimate of most forms. The last two are outside the exchanger and easy to forget. On KOT.CASH the service fee is built into the rate and the payout network fee is included in the estimate, as described on the fees page; the amount shown is what is sent to you.
Fixed and floating rates
Many exchangers offer either a rate that is fixed when you create the order or a floating rate that is set when your deposit is processed. A fixed rate protects you from price moves during the confirmation wait, and the exchanger usually prices that risk into the rate. A floating rate can end up better or worse than the estimate. Neither is cheaper by definition; what matters is whether you want certainty about the final amount. On KOT.CASH the rate is fixed for your order once it is confirmed, within the time window shown, as explained on how it works.
A worked comparison
Suppose you swap the same amount at three imaginary services. All numbers are invented to show the method; they say nothing about any real exchanger.
| Service A | Service B | Service C | |
|---|---|---|---|
| Advertised | 0% fee | 0.5% fee | Best rate |
| Rate markup vs market | 1.2% | 0.3% | 0.8% |
| Separate service fee | 0 | 0.5% | 0 |
| Payout network fee on $500 | $3 (0.6%) | $1 (0.2%) | $1 (0.2%) |
| Total cost on $500 | 1.8% | 1.0% | 1.0% |
The service with "0% fee" turns out to be the most expensive, because the cost sits in the rate. That is the general lesson: percentages in ads are not comparable, final amounts are. The rate markup calculator shows how far a quoted rate is from the market, and the swap fee calculator adds up all parts for your own numbers.
How fees differ by type of service
- Centralised exchange: trading fee plus spread, then a withdrawal fee in the destination coin; deposit and withdrawal are two extra steps.
- Instant exchanger or swap service: cost mostly in the rate and the payout fee; one deposit, one payout, no balance held.
- Decentralised exchange: protocol fee, price impact on thin pools, and gas for every transaction you sign; on small amounts gas dominates.
- P2P: no protocol fee, but a wider spread and counterparty risk, which is a cost of its own.
Checklist for comparing exchangers
- Fix the input: the same amount of the same coin on the same network.
- Fix the output: the same coin on the same payout network.
- Write down the final receive amount from each service at the same moment.
- Add your own sending fee and any exchange withdrawal fee, which are the same for every exchanger only if you send from the same place.
- Check fixed or floating: a floating estimate is not a promise.
- Read the minimum amount and the rules for refunds and checks, such as the AML policy.
Where the network fee goes
The network fee is not the exchanger's income: it is paid to the miners or validators of the blockchain that carries your payout. It rises when the network is busy, which is why the same swap can cost a little more at a different hour. Ethereum is the most sensitive to load among the large networks; TRON, BNB Smart Chain and Solana are usually much cheaper per transfer, and Bitcoin depends on the fee market in the mempool.
To see the method on real pairs, open BTC to USDT or ETH to USDT, switch the payout network and watch the receive amount change. For the opposite direction, USDT to BTC shows how the Bitcoin payout fee affects the result.
FAQ
What fees does a crypto exchanger charge?
Usually a markup built into the rate, sometimes a separate service fee, and the network fee for sending you the payout. Your own sending fee and any exchange withdrawal fee come on top.
Is a 0% fee exchanger really free?
Rarely. The cost is usually in the rate. Compare the final amount you receive for the same input across services instead of the advertised percentage.
Why is the network fee different every time?
It is set by demand for space on the blockchain, not by the exchanger. When a network is busy, the fee for including a transaction rises.
Is a fixed rate more expensive than a floating one?
Not necessarily. A fixed rate includes the risk of price moves during the wait; a floating rate can end better or worse than the estimate. It is a choice between certainty and chance.