In brief. A crypto exchange service is a party to the transaction, not a platform connecting two users. It holds cryptocurrency and fiat reserves, follows external market quotes, adds a spread, and locks the rate for the duration of an order. Once the coins are received and verified, the service makes a corresponding payout from its own reserves. You exchange assets with the service, not with another customer.
An Exchange Service Is Not an Exchange or P2P: Understanding the Model
A crypto exchange service buys one asset from you and sells another at an agreed rate. Within an order, your counterparty is the service itself, not a random buyer.
If you exchange USDT for hryvnia, the service does not look for someone who wants to buy your exact amount. It receives cryptocurrency from you and pays out hryvnia from its reserve. This model determines how the rate, available amount, and settlement process are structured.
On a trading exchange, transactions are concluded between market participants. Users place buy and sell orders, and the trading engine matches them. The price depends on offers in the order book. An order may be filled only partially if there is insufficient matching liquidity at the required price.
In a P2P transaction, the counterparty is also another user. The platform may provide escrow, chat, and a dispute resolution mechanism. However, money moves from one person to another. This means you need to consider the payment method, the counterparty’s reputation, and communication risks.
| Format | Who Is the Counterparty | Where the Funds for the Transaction Come From | What Limits the Available Amount |
|---|---|---|---|
| Crypto exchange service | The service itself | The service’s reserve | Reserve availability in the required direction |
| Trading exchange | Other market participants | Orders in the order book | Liquidity and market prices |
| P2P | Another user | Funds of a specific counterparty | Their offer and willingness to make the payment |
With an exchange service, there is one responsible party. The service displays the rate, receives cryptocurrency, verifies receipt, and makes the payout. It does not need to wait for another customer with a matching order to appear.
That is why the phrase “the exchange service could not find a buyer” does not describe how such a service normally works. If the exchange direction is available, the key factors are reserve availability, compliance with the order terms, and any required checks.
For a detailed comparison of these models, see P2P, an exchange service, or a trading exchange.
Where the Exchange Rate Comes From
An exchange service’s rate is based on external market quotes, availability of the required asset, and the costs of executing the transaction. The service adds a spread to the market benchmark.
A spread is the difference between the underlying market price and the rate at which the exchange service is prepared to complete the transaction. It allows the service to maintain reserves and assume the risk of market movements after an order is locked in.
The rate should not be set arbitrarily during correspondence with a customer. The logic is different: the system takes into account external market conditions, the exchange direction, the payout method, and available reserves. The customer then sees the terms of a specific order.
An asset’s market price and an exchange rate are not identical figures. A value on an exchange chart may reflect the latest trade in a particular market. An exchange rate applies to a specific direction, reserve, and method of receiving funds.
For example, the rate for cryptocurrency paid out in hryvnia may differ from a quote on a trading exchange. The service must not only receive the asset but also make a corresponding payment in the agreed form. This difference cannot be assessed using only the latest point on a chart.
Once an order is created, the rate is locked for the period of its validity. If the customer sends the correct amount through the required network on time, the exchange service applies the agreed terms. A change on the chart alone should not be grounds for a retroactive recalculation.
An old rate cannot remain valid indefinitely. Markets and reserve levels change, so a locked price applies only to a specific order. For more detail on rate components, see how an exchange rate is formed.
What a Reserve Is and Why It Limits Your Transaction
A reserve is the pool of funds from which an exchange service makes payouts in a specific direction. The available amount depends not on the service’s willingness, but on the actual supply of the required asset.
If you sell cryptocurrency for hryvnia, the service needs a hryvnia reserve. If you buy a crypto asset, it needs a reserve of that specific asset on the selected network. Having funds available in one direction does not mean they are available in another.
For a “cryptocurrency-to-cash” exchange, the service must have cash available for withdrawal. For a remote transaction, it needs funds for the relevant payout method. When exchanging between crypto assets, both the asset itself and the transfer network matter.
A reserve is not one customer’s deposit that is immediately passed on to the next customer. It is the service’s working capital for fulfilling its corresponding obligations. After every completed transaction, the composition of reserves changes: the exchange service receives one asset and pays out another.
This is why not every amount can be exchanged immediately. A refusal or an offer of a different amount does not necessarily mean the service is unwilling to work with the customer. Often, there are simply insufficient funds for a payout in the required direction.
This mechanism has practical implications:
- The amount depends on the direction. A supply of one asset does not guarantee the availability of another.
- A transaction requires actual coverage. The service should not promise a payout it cannot make.
- The reserve changes continuously. It is affected by completed orders, deposits, and payouts.
- A promise of unlimited exchange requires an explanation. Every direction depends on funds that are actually available.
An honest service should communicate limitations before cryptocurrency is transferred. An invented “technical reason” after receiving the coins only complicates the situation and undermines trust.
A reserve alone does not prove that a service is safe. Before making a payment, check the website address, terms, payment details, and support channels. Other warning signs are described in the article on signs of a scam crypto exchange service.
Why Rates Are Locked — and What Happens if the Market Moves Sharply
The rate is locked so that the terms of a specific order do not change with every market movement. The customer can see in advance how much they will receive once the conditions are met.
The market price may change between the creation of an order and the receipt of coins. If the movement is unfavorable for the exchange service, the service assumes that risk. This rate lock distinguishes an agreed transaction from a constantly changing quote on a chart.
This risk is connected to the spread. The customer receives defined terms for the duration of the order, while the service agrees to fulfill it despite interim price movements. After timely payment, the rate should not automatically change simply because the market moved in another direction.
The other side of a rate lock is the limited validity period of the order. The longer the service waits for payment, the more difficult it becomes to maintain the old terms. The market price, asset availability, and reserve level all change.
This is why a request not to delay payment has an operational explanation. It should not turn into psychological pressure. The time limit applies to a specific order and must be clear before the transfer is made.
If coins arrive after the deadline, automatic execution at the old rate may be impossible. The same applies if a different amount, asset, or network is used. In this situation, the service must compare the actual transfer with the order rules and parameters.
A normal timer differs from the false urgency used by scammers. A timer is displayed in the order and explains the rate-lock period. Scammers, by contrast, rush users in chat, threaten account blocking, or demand an additional payment without a clear reason.
What Happens to Your Coins After You Send Them
After the transfer, the service verifies receipt of the coins, the transaction status, and compliance with the order parameters. It then assesses risks related to the origin of the assets and makes the corresponding payout from its reserve.
The customer sends cryptocurrency first because blockchain and fiat transactions work differently. A confirmed blockchain transfer usually cannot be reversed unilaterally. In certain cases, a fiat payment can be disputed, reversed, or made using someone else’s payment details.
If an exchange service systematically paid first, it would have no protection against such scenarios. Therefore, the service first verifies receipt of the asset and then performs its part of the transaction. This is an inconvenient but fundamental asymmetry of the exchange model.
Trust here should not rely on requests to “just believe.” Before sending funds, the customer must see the rate, asset, network, amount, payout method, and order deadline. A clear communication channel is also needed in case of an error or delay.
The operational sequence looks like this:
- The transaction appears on the blockchain. The network records the transfer to the address specified in the order.
- The service checks the transaction status. A transfer visible on the network may still be awaiting confirmations.
- The data is matched against the order. The asset, network, address, amount, and other important parameters are checked.
- The origin of the coins is assessed. The check helps identify risks related to the asset’s previous movement.
- The corresponding payout is made. The service issues or transfers funds from its reserve using the agreed method.
An AML check may affect the execution of a transaction if it requires additional review. Funds with problematic origins may be delayed or not accepted for exchange. You should not attempt to conceal the origin of assets or bypass the review.
The article on AML checks for coins explains what this type of analysis assesses.
An exchange service cannot change the details of an already completed blockchain transaction. Sending funds through the wrong network, to a third-party address, or with incorrect details may make recovery impossible. Therefore, all parameters must be checked before sending coins.
Online and Offline: The Same Mechanics, Different Delivery
Online and offline exchanges operate under the same financial model. The difference is how the customer receives funds after the order is completed.
In both formats, the service checks the direction, available reserve, and transaction parameters. The rate is locked for the order period. After receiving and verifying the cryptocurrency, the exchange service completes the corresponding part of the transaction.
In the online format, the payout is made remotely using the method specified in the order. This type of exchange is available throughout Ukraine. The customer does not need to be physically present at an office.
The offline format involves collecting cash in person. It requires physical presence at the payout location and prior agreement on the transaction parameters.
MW Exchange has an office only in Kharkiv: 190 Poltavskyi Shliakh Street. Pages for other cities do not mean that offices or cash desks operate there. The terms for the relevant direction are provided on the cryptocurrency-to-cash exchange page.
Regardless of the format, the key parameters must be clear before the transfer. Check the asset, network, amount, payout method, and rate-lock period. Answers to common organizational questions are collected in the frequently asked questions about exchanges section.
If you need customer instructions rather than an explanation of the internal mechanics, read step by step: how to sell cryptocurrency.
What an Exchange Service Does NOT Do
An exchange service does not store cryptocurrency as a customer’s personal wallet. An address provided for an order is intended for a specific transaction, not for long-term asset storage.
You should not send coins again to old payment details without creating a new order. Transaction parameters, the available network, or the address may change. Such a transfer is more difficult to match correctly with your transaction.
An exchange service also does not invest customer funds or promise profits. “Growing a deposit,” passive income for transferring coins, or guaranteed compensation for market losses are not part of an exchange service.
If, under the guise of an exchange, you are asked to make an insurance payment, top up an investment balance, or transfer assets into trust management, the mechanism is already different. Such an offer cannot be assessed as a standard cryptocurrency exchange.
The service does not guarantee a rate after an order’s validity period ends. Markets and reserves change, so an old price cannot remain valid indefinitely. A new current order is required for new terms.
An exchange service does not control the blockchain and cannot reverse a confirmed transfer at the customer’s request. An error in the address or network may result in loss of funds. Support can review the situation but cannot rewrite a transaction.
An exchange service also does not replace a tax adviser or lawyer. The answer for a specific person depends on their circumstances and documents. Information about the service and available communication channels is provided on the about MW Exchange page.
FAQ
How does a crypto exchange service make money?
An exchange service earns income from the spread between the market benchmark and the rate of a specific transaction. The spread is related to processing the transaction, maintaining reserves, and the risk of price changes after an order is locked. This does not mean the rate can be changed arbitrarily after coins are received: the agreed terms apply during the order’s validity period.
Why do I have to send cryptocurrency first?
A confirmed blockchain transaction usually cannot be reversed unilaterally. Fiat payments can be disputed or reversed in certain cases. If the service paid first, it would have no protection against fraudulent transactions. Therefore, the exchange service first verifies receipt of cryptocurrency and then makes the corresponding payout from its reserve.
What is an exchange service reserve?
A reserve is the pool of funds from which the service makes payouts in a particular direction. Selling cryptocurrency for hryvnia requires a hryvnia reserve. Buying a crypto asset requires a reserve of that asset on the relevant network. The reserve determines whether the exchange service can process the required amount at that time.
Why does an exchange service rate differ from an exchange rate?
An exchange chart shows quotes under specific trading conditions. An exchange service’s rate takes into account the direction, payout method, available reserve, spread, and rate-lock risk. Therefore, it is not accurate to compare it only with the latest price on a particular chart. At the same time, the customer must know the terms before transferring cryptocurrency.
Does an exchange service check the origin of coins?
Yes, transactions may be checked to assess risks related to the asset’s previous movement. If the origin of coins raises concerns, the transaction may require additional review. This check should not be treated as a formality or bypassed. Its purpose is to assess transaction risk.
What happens if the rate changes while I am paying for an order?
If you meet the deadline and other order terms, the locked rate applies. Market movements after the order is created should not by themselves change the agreed price. If payment arrives late, in a different amount, or through the wrong network, automatic execution under the original parameters may be impossible.
