Sweepbase

Spent the last couple months pulling fee structures from 141 crypto debit and credit cards into a comparison page. The thing that kept surprising me: marketing copy and real cost almost never line up. Almost every card says "no fees" somewhere on its landing page. Almost none actually charge nothing.

Here are the five fee buckets that move the needle, ranked by how often they trip people up.

1. FX markup. Ranges from 0 to 3 percent on the cards I checked. The trick: 0 percent FX often hides inside a wider crypto-to-fiat conversion spread. A 0 percent FX card with a 2 percent conversion spread costs more than a 1 percent FX card with a tight spread.

2. Conversion spread. The gap between what the card uses to convert your crypto and the actual market rate at that moment. Never appears as a line item on the statement. The only way to find it is a small test transaction compared against the live rate.

3. ATM fee. Usually flat or percentage on top of any FX. Some cards give a free monthly allowance (200 to 500 USD) before the fee kicks in. If you withdraw cash often this is usually the biggest fee on your statement, not FX.

4. Annual or issuance fee. Most cards I saw are 0 here, but a few premium tiers charge 100 to 500 USD a year and claim cashback offsets it. With realistic spend the math rarely works out.

5. Top-up fee. Bank-card top-ups often add 1 to 3 percent on the deposit side. Some products stack this on top of FX. One I found charges roughly 5 percent on credit-card top-up, which makes the headline 0 percent FX meaningless.

The combined cost is what matters. I wrote a longer breakdown with the formula and per-card numbers here: https://sweepbase.net/guides/crypto-card-fees-explained

Happy to dig into specific cards if anyone is considering one.