# How payment processing fees are actually built

https://www.uniwebpay.com/guides/payment-processing-fees-singapore/

*Last updated: 2026-08-03*

The percentage on your statement is not one number, it is three stacked on each other: interchange, which the scheme sets and pays to the card’s issuer; scheme fees, which the network keeps; and the acquirer’s margin. Only the third is negotiable, which is why two providers quoting very different numbers are usually not disagreeing about the same thing.

**In short**

- Three layers: interchange (to the issuer), scheme fees (to the network), acquirer margin (negotiable).
- Interchange is the floor. No provider can price below it, and anyone who appears to is recovering it elsewhere.
- What moves your effective rate most is your card mix, not your negotiation.
- Card present costs less than card not present. Foreign-issued costs more than local.
- Uniweb Pay quotes per merchant and does not publish rates — some Singapore providers do, and that is a real reason to look at them.

## The three layers, and which one you are actually negotiating

Interchange is the portion of a card fee that goes from the acquirer to the bank that issued the customer’s card. The card scheme sets it, not the acquirer and not the issuer, and it varies by card type, by transaction type and by where the card was issued. It is the floor under any rate you will ever be quoted.

Scheme fees are what the network itself keeps for running the rails — authorisation, clearing, and the assorted per-transaction and per-account charges that come with being connected to it. Also not set by your provider.

The acquirer’s margin is the third layer, and it is the only one anybody can move. It covers underwriting you, holding your merchant account, settling your money, running the terminals, and answering the phone when something breaks. When a provider "sharpens a rate", this is the layer being sharpened.

The practical consequence is that a rate quoted with no reference to your card mix is not really a quote. Two merchants on identical margins can have effective rates that differ by a lot, purely because one takes mostly local debit across a counter and the other takes mostly foreign-issued credit online.

## What actually moves your effective rate

In rough order of size, and none of these is about who you signed with.

**The drivers, largest first**

| Driver | Direction | Why |
| --- | --- | --- |
| Card present vs not present | Present costs less | The card or phone was at the terminal, so the fraud risk is lower and the interchange band is lower. |
| Card type | Debit < consumer credit < commercial | Rewards and credit lines are funded partly out of interchange; commercial cards carry more of it. |
| Where the card was issued | Local costs less than foreign | Cross-border interchange is higher. Directly relevant if you enabled the visitor wallets because your customers are visitors. |
| Average ticket | Depends on the pricing shape | A fixed per-transaction component hurts small tickets; a pure percentage hurts large ones. |
| Method mix | Varies | QR wallet rails price differently from card rails, and a statement that does not separate them is hard to reason about. |

The thing worth taking from that table is that a merchant can change their own effective rate without changing provider — by getting more of the mix card-present, or by making sure the cheaper rails are actually enabled and being used rather than sitting switched off.

## Blended, interchange-plus, and why a low headline number can cost more

A blended rate is one percentage across everything. It is simple to read, simple to forecast, and it hides which of your transactions is expensive — which is fine if your mix is stable and a problem if it is not.

Interchange-plus quotes the acquirer margin separately from the pass-through cost, so the statement shows what went to the issuer and the scheme and what went to the provider. It is harder to read and it is the only shape that lets you tell whether a rate change is your provider or your customers.

Neither is inherently better value. What matters is whether the shape matches how stable your mix is, and whether you can tell from the statement which transactions cost what. A headline number is not comparable across two providers unless you know which shape each is quoting.

> **Costs that are not on the rate card**
> - Terminal rental or purchase, and what a replacement costs when one dies.
> - Whether a wallet method settles into a separate account — that is a daily reconciliation, indefinitely.
> - Chargeback administration fees, separate from the disputed amount itself.
> - Statement or account fees, and minimum monthly charges.
> - What it costs to leave, and how long the notice period is.
>

## How to read a statement you already have

1. Take one month and divide total fees by total gross takings. That is your effective rate, and it is the only number worth comparing to anything.
2. Split the same month by method: cards, wallets, QR. If the statement will not let you, that is itself a finding.
3. Split the card half by present and not present. If those two are close together, something is priced oddly.
4. List every line item that is not a percentage of a transaction — rentals, minimums, admin fees — and add them into the effective rate.
5. Only then compare with anyone else, and compare effective rate against effective rate.

Merchants who do this usually find one of two things: a method they are paying to have enabled and nobody at the counter offers, or a rail that is switched off and would have been cheaper than the one being used in its place.

## What Uniweb Pay does and does not publish

Rates are quoted per merchant and are not published — not the figures and not the pricing model. It is a decision rather than an omission, and it has a cost worth stating plainly: if what you need is to compare public rate cards before speaking to anyone, several Singapore providers publish theirs and we do not. [The category comparison](https://www.uniwebpay.com/guides/best-payment-gateway-singapore/) says the same thing in the same words.

What is published, and what shapes the number: in-store, online and in-app on one merchant account; the six card schemes plus Alipay+, WeChat Pay, UnionPay and Dynamic PayNow on that same account; settlement in SGD in T+1 batches; and one statement rather than several. The reconciliation cost of that arrangement is lower than a split one, every day, and it does not appear on anybody’s rate card.

What is not published, beyond rates: any guaranteed approval time, chargeback handling specifics, and which third-party POS systems acceptance can sit behind. Those are named here as gaps rather than left as silences.

## Questions merchants ask

**What is interchange?**

The portion of a card fee that goes from the acquirer to the bank that issued the customer’s card. The card scheme sets it, not your provider, and it is the floor under any rate you can be quoted.

**Why is my rate different from another merchant’s?**

Mostly card mix rather than negotiation: card present versus not present, debit versus consumer credit versus commercial, and whether the cards you take were issued locally or abroad.

**Is interchange-plus cheaper than a blended rate?**

Not inherently. It is more transparent — the statement separates what went to the issuer and the scheme from what went to your provider — which lets you tell whether a change is your provider or your customers.

**How do I compare two providers fairly?**

Compare effective rates, not headline rates: total fees divided by total gross takings for the same month, with every non-percentage line item folded in. A headline number is not comparable unless you know which pricing shape each one is quoting.

**Does Uniweb Pay publish its rates?**

No. Rates are quoted per merchant. Several Singapore providers do publish theirs, and if comparing public rate cards before speaking to anyone is what you need, that is a genuine reason to look at them.

## Related guides

- [The best payment gateway in Singapore is the wrong question](https://www.uniwebpay.com/guides/best-payment-gateway-singapore/)
- [Settlement and reconciliation](https://www.uniwebpay.com/guides/settlement-and-reconciliation-singapore/)
- [Card acceptance in Singapore](https://www.uniwebpay.com/payments/credit-cards/)
- [How to choose a payment acquirer in Singapore](https://www.uniwebpay.com/guides/choosing-a-payment-acquirer-singapore/)

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