Guide · Fees · Updated 2026-05-16
Crypto card FX margin, explained.
FX margin is the spread between the interbank exchange rate and the rate your card actually uses on cross-currency spend. Across our coverage it ranges from 0% to 3%. Over a year of typical travel, that spread can cost more than the headline conversion fee. Here is how to read it accurately.
What FX margin actually is
Banks and card networks publish two types of exchange rate:
- Interbank rate: the rate large institutions get on inter-bank trades. This is the "true" market rate at any given moment.
- Consumer rate: the rate a card actually applies when you spend. It is always slightly worse than interbank, and the gap is the FX margin.
A 1% FX margin means your card adds 1% to the cost of the conversion. Spend €100 with a USD-billed card at 1% FX: you pay roughly $109 if interbank is $1.08/EUR. Same purchase at 3% FX: you pay $111.24.
Why FX stacks with conversion fees
Crypto cards have two rate spreads when you spend in a non-base currency:
- Conversion fee: spread on crypto to the card's base currency. e.g. USDC to USD.
- FX fee: spread on base currency to spend currency. e.g. USD to EUR.
Both happen on the same transaction. A USDC-funded card spending €100 at a Lisbon café:
- Step 1: USDC to USD conversion at 1% spread = $1.00 cost on the conversion
- Step 2: USD to EUR FX at 1.20% spread = $1.30 cost on the FX
- Total effective spread: ~2.20%, $2.30 on a $100 purchase
For same-currency spend (USDC funded card, USD merchant), only the conversion fee applies. FX is zero. This is why the right card depends on your spend pattern.
FX rates across our coverage
| Card | FX (non-base spend) | Notes |
|---|---|---|
| MetaMask Card | 0% | Genuinely 0% in published terms |
| Gnosis Pay | 0% (EUR) / normal otherwise | You spend EURe; 0% for EUR merchants |
| Crypto.com Visa | 0% up to tier-dependent monthly cap | Above cap, normal rates apply |
| Nexo Card | 0% up to tier-dependent monthly cap | Above cap, normal rates apply |
| Kast Card | 0.5% | Among the lowest no-cap rates |
| Bybit Card | 0.5% | Tied for second-lowest no-cap |
| Brighty | 0.95% | EU only |
| Bleap | 1.0% | EU only, MPC custody |
| Wirex Card | 1.0% | EU EMI established |
| COCA | 1.0% | Non-custodial wallet |
| Ether.fi Cash | 1.0% | DeFi restaking collateral |
| RedotPay | 1.20% | Mid-pack; large country coverage |
| Bitpanda | 1.49% | Premium MiCA license |
| Bitsa | 1.5% | EU prepaid |
| Coinbase Card | 3.0% | US only; highest FX |
The DCC trap
At ATMs and some merchant terminals, you'll be offered "dynamic currency conversion" or "convert to your home currency at our rate." Always decline.
The DCC rate is set by the terminal operator and is typically 3-8% worse than the card network's rate. On a €500 ATM withdrawal you can lose €25-40 to DCC versus letting the card handle the conversion at standard FX.
At an ATM, choose "no conversion" or "bill in local currency". At a merchant terminal, ask them to charge you in the local currency, not in your home currency.
How to minimise FX in practice
- Match the card to the currency. Spending in EUR? Use Gnosis Pay (0%). Spending in USD? Use a USD-base card (MetaMask Card or Bybit). FX hits you on the conversion, so don't trigger it unnecessarily.
- Stack cards by use case. Run a low-FX daily card (MetaMask, Bybit, Kast) for routine spend; reserve higher-FX-but-higher-limit cards (RedotPay) for big-ticket spend where the absolute FX cost matters less.
- Avoid 0%-up-to-cap traps. Crypto.com Visa's 0% applies only up to a monthly cap; high-volume users blow past it quickly. Verify your monthly spend against the cap.
- Always decline DCC. Saves more than any card choice.
- Pre-convert when it makes sense. Holding stablecoins in your spend currency (EURe for EUR spend, USDC for USD spend) eliminates the conversion-to-spend-currency layer.
Background reading
- Crypto card fees explained — the full five-layer fee structure
- ATM withdrawal fees — separate fee schedule for cash
- Best crypto card for travel — FX-optimised picks
FAQ
What is FX margin on a crypto card? +
The spread between the interbank exchange rate and the rate your card actually uses when you spend in a foreign currency. A 1% FX margin means a €100 purchase costs the dollar-equivalent at the interbank rate plus 1%. It is charged on cross-currency spend only; same-currency spend pays no FX.
Which crypto card has 0% FX? +
MetaMask Card publishes 0% FX. Gnosis Pay is 0% on EUR-denominated spend specifically. Crypto.com Visa is 0% up to a tier-dependent monthly cap, then normal FX. Other cards range from 0.5% (Bybit) up to 3% (Coinbase Card).
How does FX interact with the conversion fee? +
They stack. A USDC-funded card spending in EUR pays: conversion fee (USDC to USD) + FX fee (USD to EUR). On a 1% + 1% card, the total spread is approximately 2% on cross-currency spend. Some cards bake them together; others publish separately.
Is "0% FX" actually free? +
Read the asterisks. Cards advertising 0% FX usually apply a monthly cap (Crypto.com Visa) or apply the rate only above a certain spend volume. Genuinely 0% in all conditions is rare; MetaMask Card is the cleanest example in our coverage.
What is dynamic currency conversion and why decline it? +
DCC is offered at ATMs and some merchants. The terminal asks if you want to "convert to your home currency at our rate." The rate is typically 3-8% worse than the card network rate. Always decline and let the card handle the conversion at its standard FX rate.