The verdict in three sentences
The FX markup is the most invisible fee in card payments: it never shows on the receipt but is added to the interbank rate. Between a 2 to 5 % FX spread and the DCC (Dynamic Currency Conversion) trap at 3 to 6 %, a merchant can lose up to 8 % on a diaspora transaction. Choosing the right settlement currency and refusing DCC recovers most of that margin.
Where the invisible cost comes from
When a customer pays in euros or dollars on a store billed in FCFA, conversion happens somewhere in the chain. The rate applied is not the market rate: the network (Visa/Mastercard), the issuing bank and sometimes the PSP each add a margin. The result: the customer pays more, or the merchant receives less, with no clear "FX fee" line anywhere.
The most common trap is DCC: at checkout, the customer is offered to "pay in their currency." It sounds reassuring but applies a clearly unfavourable rate, with a 3 to 6 % markup captured by the terminal or gateway — at the customer's expense and your store's trust.
Costed scenarios: quoted rate vs real rate
2026 order of magnitude for a 100 EUR sale collected by a store billed in FCFA (interbank rate ~656 FCFA/EUR).
| Scenario | What the customer sees | Hidden FX cost | Merchant net (est.) |
|---|---|---|---|
| FCFA billing, no DCC | Conversion by their bank | 1-2.5 % | ~63,900 FCFA |
| EUR billing, EUR settlement | None (same currency) | ~0 % | ~65,000 FCFA equiv. |
| DCC on (pay in local currency) | "Amount in your currency" | 3-6 % | ~61,500 FCFA |
| International card + PSP spread | Nothing visible | 2-4 % | ~62,800 FCFA |
| Misconfigured multi-currency | Double conversion | 4-7 % | ~60,500 FCFA |
Gap between best and worst scenario: nearly 4,500 FCFA on 100 EUR, i.e. ~7 % of margin evaporated on every international order.
Levers to cut the markup
Three technical decisions change everything. First, choose the settlement currency: if your customers are mostly diaspora paying in euros, settling in euros and converting in bulk avoids per-transaction conversion. Second, refuse DCC by default in the gateway config. Third, show a clear price in the customer's currency to avoid double conversion.
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| Lever | Effect on FX cost | Difficulty |
|---|---|---|
| Disable DCC | -3 to -6 % | Low (config) |
| Settle in sale currency | -2 to -4 % | Medium |
| Native multi-currency pricing | -1 to -3 % | Medium |
| Batch conversion | -1 to -2 % | Depends on bank |
| Fee transparency to buyer | +trust | Low |
Mini case study
Aminata sells crafts from Abidjan and 60 % of her sales come from the diaspora in France, paid by card. She bills in FCFA with DCC on by default. On an 80 EUR average basket, DCC captures ~5 %, a shortfall of about 2,600 FCFA per order.
With 150 diaspora orders/month, that's 390,000 FCFA of lost margin each month. By disabling DCC and settling in bulk-converted euros, she recovers most of it: about 4.3 million FCFA over the year, purely by fixing the FX configuration, without touching prices or volume.
FAQ
What exactly is DCC? Dynamic Currency Conversion offers the customer to pay in their own currency at checkout. The rate applied is unfavourable, with a 3 to 6 % markup captured by the gateway, often at the customer's expense.
How do I spot a hidden FX spread? Compare the applied rate to the day's interbank rate: an unjustified 2 to 5 % gap is a markup. It almost never appears as a separate line on the receipt.
Should I bill in FCFA or in euros for the diaspora? If your customers mostly pay in euros, settling in that currency and converting in bulk cuts the cost by 2 to 4 % versus converting transaction by transaction.
Is DCC illegal? No, it's legal but must be an explicit customer choice. The problem is that it's often on by default and presented misleadingly, which hurts trust.
Does mobile money have this problem? Much less: Wave, Orange Money or M-Pesa operate in local currency with no card conversion. FX markup mainly affects international cards.
Let's talk about your project. We audit your gateway, kill DCC and optimise the settlement currency to recover your diaspora margin. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
