· Flint blog
Multi-currency settlement: how it works and where the fees hide
Selling internationally means someone converts money somewhere, and every conversion has a spread. Multi-currency settlement is the machinery that decides who converts, when, and at what markup. Merchants who don't understand it pay 2 to 4% more than they think they do, because the costs hide in exchange rates rather than line items. Here's the machinery, the real costs, and the shortcut.
The three settlement models
Every provider implements one of three models. First: transact in local currency, settle in your home currency. The customer pays €89, you receive dollars, and the provider converts at a rate they set. Second: like-for-like settlement. You hold a EUR account and euros settle as euros; you convert when you choose. Third: multi-currency treasury accounts, where a provider holds balances in several currencies and you convert between them on demand.
Model one is the default because it's easiest, and it's where merchants get quietly charged. Models two and three cost monthly fees and require banking setup, but put the conversion decision back in your hands.
Where the fees actually sit
The costs stack in layers, and only some appear on invoices:
| Layer | Typical cost | Visible on statement? |
|---|---|---|
| FX markup on conversion | 1 to 3% over mid-market rate | No, embedded in the rate |
| Cross-border interchange/assessment | 0.6 to 1.5% | Sometimes, as 'international surcharge' |
| Currency conversion by the customer's issuer | 1 to 3% (customer pays) | No, but it drives disputes |
| Like-for-like account fees | $10 to $50 per currency per month | Yes |
The compounding case is worst: a customer pays in AED, the PSP settles you in EUR, your bank converts to USD. Two spreads plus a cross-border fee can total 4 to 5% before your processing rate. High-risk merchants get it worse, because high-risk PSPs pad FX markups knowing you can't shop around easily.
Practical rules for card rails
Ask your provider three questions in writing: what reference rate they convert against, what their markup is, and whether like-for-like settlement is available for your top currencies. Then price the answer. If 30% of your volume is EUR and the markup is 2%, a EUR account paying for itself is simple arithmetic. Display prices in local currency regardless of settlement model, since customers convert mentally at bad rates and abandoned carts cost more than the FX ever will. And avoid double conversion above all: every extra hop is a fee you chose.
The stablecoin shortcut
Stablecoin settlement collapses the chain. A customer in any country pays USDT or USDC against your dollar price, the rate locks at checkout, and you receive dollar-denominated funds in minutes. There is no correspondent chain, no per-currency account fee, and no FX markup layer, because there is no conversion between payment and settlement.
It doesn't cover the customer who only holds AED in a bank account; that buyer still needs your card rail and its conversion machinery. But for the growing share of international customers who hold stablecoins precisely because their local rails are expensive, it's the cheapest path between their money and yours. Flint settles this way by default, one integration for every country, and the multi-currency gateway page covers the setup. For settlement speed specifics, see instant settlement.
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