The verdict in three sentences
When a diaspora customer pays your shop in EUR or USD, the real cost isn't just the 2.9 % + fixed card fee — it's also the hidden FX margin. This margin, the FX spread, adds 1.5 to 3.5 % above the interbank rate, usually invisible on the invoice. On a 100 EUR collection, the true all-in cost can reach 6 to 8 % once everything is added.
Headline rate vs real rate: where the hidden margin lives
The interbank (mid-market) rate is the true market rate. The aggregator applies a spread above it: it converts at a less favourable rate and keeps the difference. This spread stacks on top of the visible card fees.
| Cost component | Estimated 2026 rate/fee | On 100 EUR collected |
|---|---|---|
| International card fee | 2.9 % + fixed | ~2.9 % + fixed |
| FX spread (currency margin) | 1.5 to 3.5 % | 1.50 to 3.50 EUR |
| Local payout fee (withdrawal) | 0.5 to 1 % | 0.50 to 1.00 EUR |
| Estimated all-in cost | 5 to 8 % | 5 to 8 EUR |
| Net actually received | — | 92 to 95 EUR |
Lesson: an advertised "2.9 %" can hide a real cost of 6 %. Always ask for the applied conversion rate and compare it to the day's mid-market.
Compare aggregators on spread, not headline fees
Two aggregators showing the same card fee can have very different real costs depending on their FX spread. The right metric is the all-in cost: how much net local currency you receive for 100 EUR collected.
| Aggregator profile | Headline card fee | Estimated FX spread | Estimated all-in cost |
|---|---|---|---|
| Premium international aggregator | 2.9 % + fixed | 0.5 to 1.5 % | 3.5 to 4.5 % |
| Regional aggregator | 3.5 % | 2 to 3 % | 5.5 to 6.5 % |
| Local PSP + bank conversion | 2.5 % | 3 to 3.5 % | 5.5 to 6 % |
| "No-fee" solution (hidden spread) | 0 % shown | 4 to 5 % | 4 to 5 % |
The figures above are 2026 ballparks: the real spread depends on the currency pair and the day's volatility.
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Mini case study
Mariama sells crafts from Nairobi to a diaspora clientele in France. A customer pays a 100 EUR basket by card. The regional aggregator advertises 3.5 % fees but applies a 3 % FX spread: real all-in cost around 6.5 %, so 6.50 EUR lost, she receives only 93.50 EUR in local-currency equivalent. Switching to a premium aggregator (1 % spread, 2.9 % fees), her all-in cost drops to ~4 %, she receives 96 EUR: 2.50 EUR more per order, or 250 EUR across 100 orders.
FAQ
What exactly is the FX spread? It's the margin the aggregator adds to the interbank rate at conversion. Invisible on the invoice, it's often 1.5 to 3.5 % of the amount, as much as or more than the visible card fee.
How do I know if I'm overpaying? Compare the applied conversion rate to the day's mid-market rate (visible on public sources). The percentage gap is your spread. Add it to card fees for the all-in cost.
Is a "no-fee" solution really free? Rarely: "no fee" usually means the margin sits entirely in the FX spread, sometimes 4 to 5 %. A transparent rate with a small spread beats a "0 %" with a high spread.
How do you show a multi-currency price without eroding margin? Build the estimated all-in cost (5 to 8 %) into your diaspora price, or show a slightly marked-up EUR price. The key is knowing your real cost before setting the rate.
Does the spread change during the day? Yes, it tracks the currency pair's volatility. For large amounts, an aggregator that locks the rate at payment time reduces exchange risk.
Let's talk about your project. We audit your diaspora conversion costs and pick the aggregator with the best all-in cost for your shop. 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.
