# Convert Fiat to Crypto: Card, Transfer, and What Each Really Costs

> A comparison of the payment methods behind a crypto on-ramp, what each costs, how long each takes to settle, and which one fails in which situation.

- Source: https://cryptounderthehood.com/convert-fiat-to-crypto-methods/
- Published: 2026-03-21
- Author: Ivan Kruse
- Publication: Crypto Under the Hood — How crypto payment infrastructure actually works
- Topic: onramp
- Tags: onramp, payments, settlement

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There are four realistic ways to convert fiat to crypto through a regulated venue, and they differ more in failure mode than in price. Price is easy to compare. What happens when something goes wrong is not, and that is usually what decides whether a method is appropriate. The version of this that operates in production is [an on-ramp that publishes its limits](https://collectnexchange.cy/services/crypto-onramp), and their documentation fills most of the gaps below.

## Card

Fastest, most expensive, most likely to be declined.

A card purchase settles in seconds and the crypto is available immediately. The cost is 1.5 to 3.5 percent depending on the card type and the country. Corporate cards are frequently more expensive than personal ones because the interchange is higher.

The failure mode is the decline. Card issuers in several European markets block crypto merchant category codes by default, and many treat a crypto purchase as a cash advance, which attracts a separate fee from your bank on top of the platform fee. That fee does not appear anywhere in the platform's quote because the platform never sees it.

If you are going to use a card, make one small test purchase first and then check your bank statement, not the platform's confirmation. The cash advance fee shows up on the statement.

## SEPA transfer

Slowest to set up, cheapest to run, most reliable.

A SEPA transfer costs nothing or close to nothing and settles the same business day for SEPA Instant, next business day otherwise. Once the first transfer has cleared and the account relationship exists, subsequent transfers are routine.

The failure mode is the first transfer. Name mismatches between the sending account and the platform account cause returns. So do missing reference codes. A returned transfer is not lost, but it takes three to five business days to come back and the return usually costs something.

For recurring purchases this is the correct method. The setup cost is one-time and the running cost is near zero.

## Open banking

A middle option that has become the default in several markets.

The platform initiates a payment directly from your bank account through an open banking provider. You authenticate in your banking app. It settles in seconds like a card but costs like a transfer, typically 0 to 0.8 percent. Above a certain balance the same logic points at [crypto rails built for fintech companies](https://collectnexchange.cy/industries/fintech) instead.

The failure mode is coverage. Not every bank is connected, and the connection breaks periodically when banks change their authentication flow. When it works it is the best of both. When it does not, you fall back to a transfer.

## Corporate transfer

What a business actually uses, and the one with the most requirements.

The money moves from a company account to the platform. The platform has to be willing to accept corporate funds, which requires that the company has been onboarded, that the beneficial owners are documented, and that the source of funds question has been answered.

The failure mode is onboarding, not payment. Once a company is onboarded the transfers are boring. Getting onboarded takes between two days and six weeks depending on the structure of the company and the jurisdiction. A company with a single shareholder in an EU country is quick. A company with a holding structure across three jurisdictions is not.

If you are planning to convert fiat to crypto as a business, start the onboarding before you need the funds. A platform running [a crypto on-ramp for corporate accounts](https://collectnexchange.cy/services/crypto-onramp) will tell you what documents are needed up front, and the list is longer than most people expect.

## The comparison in one place

| Method | Cost | Settlement | Fails when |
|---|---|---|---|
| Card | 1.5 to 3.5% | Seconds | Issuer blocks the MCC, or charges a cash advance fee |
| SEPA transfer | 0 to 0.5% | Same or next business day | Name mismatch or missing reference on the first transfer |
| Open banking | 0 to 0.8% | Seconds | Your bank is not connected, or the connection is broken |
| Corporate transfer | 0 to 0.5% | Same or next business day | Onboarding is incomplete |

## What actually determines the right choice

Not the percentage. The percentage difference between the cheapest and most expensive method on a five hundred euro purchase is about twelve euros. That matters if you are doing it weekly and does not if you are doing it once.

What determines the right choice is whether the money needs to arrive at a predictable time, whether it is coming from a company or a person, and whether you can absorb a three day delay if the first attempt bounces. Answer those three and the method chooses itself.

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This article explains how something works. It is not financial advice.
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