Where the cost hides
A crypto platform earns in five places, and no platform charges in all of them equally. The spread: the gap between the price at which it sells you a coin and the price at which it buys it back, invisible on the fee page and often the largest cost on simple buy buttons. The trading fee: a percentage of each order, usually lower for makers, who place limit orders that wait, than for takers, who hit an existing price. Deposit and withdrawal fees in euros: SEPA transfers are often free, cards cost two to four percent, and withdrawing euros may carry a fixed fee. Network fees when you move coins to your own wallet, set by the blockchain but sometimes marked up. And a cut of staking rewards, often a quarter or more, on platforms that stake your coins.
Instant buy versus the order book
Most platforms offer two ways to buy. The instant or convert button quotes a single price and is the one beginners use; its spread is commonly one to two percent, sometimes more, on top of any stated fee. The exchange or pro view shows an order book where you place orders at a price; its fee is a stated percentage, typically 0.1 to 0.5 percent, and the spread on a liquid coin is a few hundredths of a percent. The same platform can therefore cost twenty times more through one door than through the other.
How to compute the all-in cost
Take the platform's quoted buy and sell prices at the same moment and divide the gap by the mid price: that is the spread. Add the stated trading fee twice, once to buy and once to sell. Add the euro deposit fee for the way you deposit and the euro withdrawal fee. If you intend to hold the coins yourself, add the network withdrawal fee at the platform's rate, not the blockchain's. The sum, as a percentage of the amount, is what a round trip costs, and it is the only figure that lets you compare platforms.
Tiers and tokens
Trading fees fall with monthly volume, in tiers that start at a few tens of thousands of euros a month; a private investor rarely reaches the second tier. Some platforms cut fees for holding their own token, which turns a fee discount into a position in a volatile asset. Neither affects the spread on the instant button, which is where most retail cost sits.
What MiCA requires
An authorised crypto-asset service provider must publish its fee schedule, act honestly and fairly in the client's interest, and execute orders on the best available terms, with a written execution policy. It must disclose when it acts as the counterparty to your trade, which is exactly what an instant-buy service does. The rules do not cap fees, but they make the spread a disclosed item rather than a hidden one; read the execution policy, which will tell you whether the platform trades against you.
In practice
Deposit euros by SEPA transfer, never by card. Use the order-book view with limit orders rather than the instant button. Check the network withdrawal fee before you choose a coin to move to your own wallet; on some chains it is cents, on others tens of euros. Compare the round-trip cost on €1,000 across two or three authorised platforms before choosing one. And remember that a low fee on an asset that halves is still a bad trade; the fee is the part you control.
