Card Purchase Costs, Measured

Buying with a card is the fastest route into crypto and the most expensive. The total cost has four components and only one is typically advertised.

The components

The card processing fee. Charged by the platform, typically in the range of two to four percent, sometimes higher. Usually disclosed.

The spread. Card purchases almost always go through a simplified interface rather than an order book, which carries a margin on top of the fee.

The cash advance charge. Some card issuers treat crypto purchases as cash advances rather than purchases, which adds a fee and starts interest accruing immediately with no grace period.

This is the one that catches people and it is decided by the card issuer, not the platform.

Currency conversion. If the platform charges in a different currency to your card, the issuer adds a conversion margin.

The measurement method

For a fixed purchase amount, record:

1. The amount debited from the card, in your currency
2. The quantity of crypto received
3. The mid price on the order book at the moment of purchase
4. Any separate line on the card statement

Total cost is the difference between what you paid and what the same quantity would have cost at mid price, expressed as a percentage.

Check the card statement a few days later for a cash advance line, which is not visible at the time of purchase.

What we have observed

Total costs for card purchases in the range of four to eight percent are typical once the spread is included. Where a cash advance charge applies, higher.

The same purchase by bank transfer, executed on the order book, has come in under half a percent on every platform we have measured.

The difference on a purchase of a few hundred units of currency is the price of a meal. Repeated monthly, it is a meaningful share of annual contributions.

When a card is defensible

Small first purchase, where the absolute amount is trivial and the objective is learning the process.

Genuine urgency, which in practice almost never applies to a long-term position.

No bank transfer option in your jurisdiction or with your bank.

Outside those, the case is difficult to make.

The alternative

Bank transfer for deposits, order book for execution.

Bank transfer is typically free and takes between the same day and two days. On a recurring purchase where timing is irrelevant by design, that delay costs nothing.

Platforms publishing both deposit methods and their charges, such as platforms that do not round the fee up, make the comparison possible before opening an account.

The check worth doing once

Look at your last card purchase on your bank statement and identify every line associated with it.

Most people find at least one charge they did not know about, and the exercise is what converts an abstract percentage into a decision to change method.