Currency, rounding and hidden fees in small orders

A small order is not a scaled-down large order. The rate scales with the quantity, and several of the costs do not. A card processor may charge a percentage plus a fixed amount. A currency conversion may add a spread on the whole amount. A rounding step may add a fraction of a cent. At 1,000 units those costs are a visible share of the charge. At 100,000 units they are a rounding line.

The headline rate is the part of the price that is easiest to compare and the part that hides the rest. The final charge is the rate times the quantity, plus the fees, minus any credit, rounded by the panel's rule. This page walks through the lines after the rate, with the arithmetic in the open. The numbers that describe the panel come from its policy and money modules. The card fee is a published processor price, and the currency conversion is a question to ask rather than a number to assume.

The charge is not the rate

A rate is a price per 1,000 units. A charge is what leaves the wallet for a specific quantity. The conversion is one multiplication and one division: rate times quantity, divided by 1,000. The result is then rounded by the panel's rule and adjusted by any fee. A buyer who compares rates is comparing an input. A buyer who compares charges is comparing the output.

The difference is small at a large quantity and large at a small one. At 1,000 units, the charge is the rate. At 100 units, the charge is one tenth of the rate, and the minimum charge can be larger than the arithmetic result. The minimum charge this panel accepts is $0.01. An order that rounds below that is raised to the minimum, because a free order still costs the supplier money.

The minimum charge is not a fee. It is a floor. A 10 unit order at a low rate can produce a charge below one cent, and the floor sets it to one cent. The effective rate for that order is much higher than the headline, and the reason is the floor, not the rate. If you need a very small quantity, compare the minimum charge with the value of the order.

Fixed fees and small orders

A fixed fee is the same amount on every transaction. A proportional fee is a share of the amount. A card processor often uses both. The published US card price used here, read on 7 November 2026, is 2.9 percent plus 30 cents per successful domestic transaction. The percentage scales with the order. The 30 cents does not.

On a minimum top-up of $5.00, the card fee is $0.45, which is 9.0% of the top-up. On a maximum top-up of $500.00, the fee is $14.80, which is 3.0% of the top-up. The fee is larger in dollars on the large top-up and smaller as a share.

If the panel passes the fee to the wallet credit, the credit is the top-up minus the fee. On the minimum, the credit is $4.55 against a $5.00 payment. On the maximum, the credit is $485.20 against a $500.00 payment. If the panel absorbs the fee, the credit is the full amount and the fee is already inside the price. Ask which one applies before the first top-up.

Rounding: the step and the direction

A charge has to land on an amount the panel can store. This panel stores micro-dollars, so a charge is rounded to the micro-dollar, not to the cent. The charge is rounded once, at the end, after the rate is multiplied by the quantity. A panel that stores cents rounds earlier and loses the fraction. A panel that rounds the rate before multiplying can produce a different result at a small quantity.

Take 1,234 units at the median rate. The exact charge is $0.9008. Rounded up to the cent, the charge is $0.91. The difference is $0.0092, or 1.02% of the exact charge. The direction is in the panel's favour in this example. A panel that rounds down is giving the fraction back.

The step matters more than the direction at small amounts. A one cent step on a one dollar charge is one percent. The same step on a hundred dollar charge is one hundredth of a percent. If the rate difference between two panels is smaller than the rounding step, the rounding can decide which panel costs less at your quantity. Compare the final charge, not the rate.

Currency conversion: ask who converts

A price can be quoted in one currency and settled in another. The conversion can happen at the card issuer, at the payment processor or at the panel. Each side can add a spread, and the spread is usually inside the exchange rate rather than on a separate line. A buyer who compares the quoted price with the card statement sees the spread only after the payment posts.

Ask three questions before a cross-currency payment: which currency the panel prices in, which currency the card settles in, and which side performs the conversion. If the panel prices in dollars and the card settles in dollars, there is no conversion at the panel. If the card settles in another currency, the issuer may convert at its own rate. If the panel converts, the rate is the panel's. The three answers produce different final charges for the same order.

A conversion is not automatically a bad deal. It can be cheaper than holding a foreign currency account or paying a transfer fee. The problem is the hidden spread, not the conversion itself. A quoted rate with a date and a source is a fact you can compare. A rate that appears only on the statement is a number you cannot check before you pay.

The payment method changes the fee

A card payment carries the processor fee. A crypto payment carries the network fee. A Stars payment carries the store price and the panel's conversion rate. The three fees have different shapes: the card fee has a fixed part, the network fee is set by the chain, and the Stars price is set by the store and the country. The payment method is part of the price, not a neutral choice at the end.

At the minimum top-up, the fixed part of the card fee is a large share. At the maximum, it is small. A crypto network fee is also fixed in the short term, so it has the same shape. A Stars top-up has no network fee from the buyer's side, but the store price may include a commission. The Stars versus USDT guide compares the credit received on each path.

The panel can absorb a fee or pass it through. A panel that absorbs the card fee has already included it in the price, which is why a card price can be higher than a crypto price for the same service. A panel that passes the fee through shows a lower headline and a smaller credit. Neither is dishonest if it is disclosed. The problem is a fee that appears only after the payment.

A worked example: the same five dollars

Start with the minimum top-up of $5.00. If the card fee is passed through, the credit is $4.55. The fee is $0.45, or 9.0% of the amount paid. A crypto transfer with a 1.00 dollar network fee would credit four dollars, which is a different path with a different fee. The card path and the crypto path are not the same price.

Now the maximum top-up of $500.00. The card fee is $14.80, or 3.0% of the amount paid. The credit, if the fee is passed through, is $485.20. The fee is larger in dollars on the maximum top-up and smaller as a share. The size of the top-up decides which line matters.

The worked example uses the card fee as a published price and the network fee as an illustrative input. The panel's own fee is a separate line. If the panel charges a deposit fee, add it to the fee before comparing the credit. The only number that matters at the end is the credit that reaches the wallet.

The order of operations

The charge is built in a fixed order: rate, quantity, rounding, fee, currency. The order matters because a fee applied before the rounding can be rounded again, and a currency converted before the fee can change the fee's share. Ask the panel to show the order on the checkout, or reconstruct it from the statement. A charge that cannot be reconstructed is a charge that cannot be checked.

The first step is the rate for the exact service. The second is the quantity, including the minimum. The third is the rounding rule: one rounding at the end, or a rounded rate before the multiplication. The fourth is the panel fee and the payment fee. The fifth is the currency conversion, if any. A quote that combines the steps into one number hides the one that changed.

The order also matters for a refund. A refund calculated on the charge after the fee can return less than the customer paid. A refund calculated on the charge before the fee can return more than the panel received. The policy should say which base it uses. The refund destinations guide covers the base and the destination together.

What to ask support

Three questions cover much of the hidden cost. First: is the payment fee absorbed or passed through? Second: which currency does the panel price in, and which side converts? Third: what amount will the wallet receive for a specific top-up? The third question is the one that produces a number. The first two explain the number.

Ask the questions before the first payment, and keep the answer. A support answer with a number is evidence of the quote. A support answer with a promise is not. If the answer changes after the payment, the earlier answer is the one you agreed to, and the record is the reason to keep it.

The same three questions apply to a refund. A refund can carry a fee, a conversion or a minimum. The policy should name them. If the policy is silent, the support answer is the only record, and the support answer can change with the agent.

How to read a card statement

The statement shows the posted amount, not the amount the panel quoted. The difference can be a conversion, a fee or a duplicate charge. Compare the posted amount with the checkout amount on the same day. If the difference is a conversion, the statement usually shows the rate. If the difference is a fee, the statement usually shows a separate line. If the difference is a duplicate, the statement shows two charges for one order.

The statement is also the record a dispute needs. A card dispute asks for the transaction, the amount and the reason. The statement provides the first two. The order page and the support thread provide the third. Keep the statement with the order record, not in a separate folder that is lost.

A checklist before paying

1. Calculate the charge. Rate times quantity divided by 1,000, then apply the minimum and the rounding rule.
2. Name the fee. Ask whether the panel absorbs the payment fee or passes it through, and whether a deposit fee applies.
3. Name the currency. Check the currency the panel prices in and the currency the card settles in. Ask which side converts.
4. Compare the credit. Subtract the fees from the amount paid. The result is the number to compare across payment methods.
5. Test at the minimum. A small top-up shows the fee and the credit before a large amount is at stake.
6. Keep the statement. The card statement or the transaction id shows the final charge after conversion.

Where each fee appears

Fee	Who sets it	Where it appears
Panel rate	The panel	The service page and the checkout
Minimum charge	The panel	The order page, when the charge rounds below one cent
Rounding	The panel	Inside the final charge
Card fee	The card processor	The processor's pricing page and the panel's disclosure
Network fee	The blockchain	The wallet or exchange before the send
Currency spread	The issuer, the processor or the panel	The exchange rate on the statement or the checkout
Deposit fee	The panel	The deposit page or the support answer

A qualitative comparison. The card fee is the processor's published price read on 7 November 2026; the panel's own fee is on its checkout.

The table is a map of where to look. The panel controls the rate, the minimum charge, the rounding and any deposit fee. The processor controls the card fee. The network controls the crypto fee. The issuer, the processor or the panel can control the conversion. A fee you cannot locate is a fee you cannot compare, and the first step is to ask which line it belongs to.

For the rate formula, read how to read a price per 1,000. For the cost stack, read how panel pricing works. The panel's written remedy is on the refund page, and a charge that does not match the checkout can be sent to support with the order id.

Figures marked with a data key are read from the Talon database, the policy module, the money module or the order module when this page is rendered. A dated external fact carries its source link and the date it was read.