AI agents for business finance: what they can and can't do
What AI agents can do in bookkeeping, close, collections and compliance today, where a person must stay in charge, and how to judge a product.
The short answer
The rate a search engine shows is generally a mid-market reference, the midpoint between buying and selling prices, and no provider sends money at it. A provider's customer rate is lower by its exchange-rate margin, and a separate fee may be added. The World Bank's Spain-to-Nigeria survey of August 2025 recorded an average margin of 0.98%; you can work out the margin on any quote by comparing its rate with the mid-market rate at the same moment.
You check the euro-naira rate on your phone, open a transfer app, and the naira figure is lower. It is not a mistake. Money transfer firms and banks earn in two ways: a fee you can see, and a margin built into the rate. Western Union says it plainly on its Spain page: it "also makes money from currency exchange". Knowing how to measure the margin lets you compare quotes fairly.
Mid-market rate versus customer rate
- Mid-market rate
- The midpoint between the price buyers pay and sellers accept in the wholesale market at a given moment. It is a reference, not an offer.
- Customer rate
- The rate a provider actually gives you. When you send euros to be paid in naira, it gives you fewer naira per euro than the mid-market rate.
- Exchange-rate margin
- The gap between the two, as a percentage of the mid-market rate.
- Fee
- A separate charge in euros, sometimes zero, sometimes varying with the amount and payment method.
The World Bank's Remittance Prices Worldwide survey measures exactly these two parts. For Spain to Nigeria, with data collected 2-20 August 2025, it recorded an average exchange-rate margin of 0.98% and an average total cost of 2.88% on a €140 transfer and 1.78% on a €345 transfer. Margins recorded across providers that month ran from -0.11% to 1.66%. Those figures are from one survey; prices change daily.
How to work out the margin on a quote
- Open the provider's quote and note the rate (naira per euro) and the fee.
- At the same moment, note the mid-market rate from a currency site.
- Margin % = (mid-market rate - provider rate) / mid-market rate x 100.
- Total cost in euros = fee + (amount x margin %).
Worked example (round figures for arithmetic only, not today's rate)
Say the mid-market rate is ₦1,000 per euro and an app offers ₦985 with a €2 fee on a €300 transfer. The margin is (1,000 - 985) / 1,000 = 1.5%. On €300 that is €4.50. Add the €2 fee and the transfer costs €6.50 in total, about 2.2% of the amount. The receiver gets 300 x 985 = ₦295,500, against ₦300,000 at mid-market. A second app offering ₦975 with no fee costs (1,000 - 975) / 1,000 = 2.5%, or €7.50: more, even though it says "no fee".
Why quotes differ between providers
- Promotional rates. Remitly's Spain page offers a promotional rate to new customers on the first EUR 500.00 sent; above that, its standard rate applies.
- Payment method. Providers price card, bank and cash payments differently. See card or bank in Spain.
- Payout method. Cash pickup and bank deposit can carry different prices.
- Timing. Rates move through the day. Remitly says "Any rates shown are subject to change", and Western Union calls its displayed fees and rates "estimates".
- The naira market itself. Providers buy naira at the rates available to them, which can differ from the reference you see.
Reading a quote line by line
A typical quote screen shows four numbers: what you send in euros, the fee, the exchange rate, and what the receiver gets in naira. Only the last one tells you the full result. Two habits help:
- Write down the receive amount for the same euro sum from each app you consider, within a few minutes of each other.
- Check whether the rate shown is a promotional one, and what the rate would be on your next transfer.
- Note whether the quote changes when you switch payment method or payout method; it often does.
- If a provider shows a rate that is better than the mid-market reference, it may be a promotion or an introductory offer. The World Bank survey did record a negative margin for one provider in August 2025, so it can happen, but check the fee alongside it.
Banks work the same way. A SWIFT transfer from a Spanish bank converted into naira uses the bank's own rate, and the bank's fee is separate again.
Where to check today's rate
Check the mid-market reference and the provider's live quote side by side, just before you send. Every provider read for this guide shows the rate and fee before you confirm. For more on the gap and what it costs, see FX margins on transfers to Nigeria and the euro-naira rate today.
Where Pryme fits
With Swap in a Pryme account, the rate is shown first and the fee on its own line, and you approve before anything converts, so you can run the same margin check. Euros stay euros in your multicurrency account until you choose.
Questions people ask
Why is the Western Union rate lower than Google?
A search result generally shows a mid-market reference. Western Union says it makes money from currency exchange, so its customer rate includes a margin.
How do I calculate the exchange rate margin?
(Mid-market rate minus provider rate) divided by the mid-market rate, times 100. Do it at the same moment.
Is a zero-fee transfer free?
Not necessarily. The cost can sit in the exchange-rate margin.
What is a normal margin on euro to naira?
The World Bank's August 2025 survey for Spain to Nigeria recorded an average of 0.98%, with providers from -0.11% to 1.66%. Check the current quote.
Sources
- World Bank Remittance Prices Worldwide: Spain to Nigeria (data collected 2-20 Aug 2025) · accessed Oct 2026
- Western Union Spain: Send money to Nigeria · accessed Oct 2026
- Remitly: Send money to Nigeria from Spain · accessed Oct 2026
This article is general information, not financial, legal or tax advice. Products described are provided under the terms on this site and are subject to regulation and eligibility.