Payment Rails
Why this chapter
To understand where the percentage on every card sale of yours goes, and why in some countries it has almost disappeared.
An analogy
Picture a town market with several gates. Through one gate come buyers with loyalty cards — the trader pays for their entry, part of the money goes to whoever issued the card and part to the keeper of the gate. Through another gate, built by the town, entry costs next to nothing, because the town did not build it for profit. The traders gradually move their signs to the second gate, and the whole economy of the first begins to crumble: there is nothing left to pay the card issuers with. The fourteenth chapter is about how these gates are built, who earns on them, and why fast cheap gates change not only prices but also the rules that protect the buyer.
How it works
A payment = a message + clearing + settlement. A card network (Visa/MC) holds no money — it counts and gives orders, living on basis points. Interchange is paid by the acquirer to the issuer: this is how the network “bribes” banks into issuing cards; your cashback is a slice of interchange (the EU capped it at 0.2–0.3% — and cashback died there; in the US credit cards run at ~1.5–2%).
Clearing versus settlement: net clearing (DNS) shrinks the need for reserves several times over while it piles up intraday risk; RTGS settles every payment finally and at once, but demands reserves for all of it. State instant-payment rails (UPI, Pix, SBP) sell settlement almost at cost — and eat the card rent.
Wallets and fintech: EMIs and MTLs hold other people's money 1:1 (segregation) and earn on float + fees — creating money by lending is closed to them. The fintech ladder: BaaS (on someone else's license) → EMI (your own float) → a bank (the full engine). The investor's view: any fintech raises three questions: whose license it lives on, where the float sits, and what share of revenue is interest.
The words of this chapter
The three parts of a payment
Any payment consists of a message, an offsetting of mutual claims, and a final settlement. These are three different events, and they happen at different times.
The split appeared out of thrift: counting every payment separately is expensive, while piling them up and settling the difference is cheap.
Interchange
The charge the merchant's bank passes to the cardholder's bank for every operation. Cashback is formed out of it.
It was invented by the network so that banks would find it worth issuing cards: without that charge nobody would hand them out for free.
Net clearing
A way of settling in which participants pile up mutual payments and transfer only the difference at the end of the day.
It was invented for the saving: the real money needed is many times less than the turnover.
RTGS
A way of settling in which every payment goes through separately and finally at the moment it is sent.
It was invented as the opposite of netting: there is no intraday risk at all.
Float and EMI
Float is other people's money sitting with a payment company. An EMI is the license that allows it to hold and move that money but forbids it to lend out of it.
That license was invented as a middle rung: launch faster than a bank, but without the right to create money.
Irrevocability
A property of an instant payment: what has been sent cannot be brought back, and there is no mechanism for disputing it the way there is with a card.
It appears as the flip side of speed: settlement is final in the same second.
The ladder of licenses
Three rungs for a payment business: working on somebody else's banking license, your own payment license with the right to hold other people's money, and finally a full bank.
It appeared because regulation is trying to let new players into the industry without letting them straight through to creating money.
What happens to the balance sheet
Compare two routes for one and the same purchase. By card: the message travels through a network, two banks hold the money, the network does the counting and the commanding, and the trader pays the fee — out of which the buyer's cashback is fed as well. By a fast state rail: the message and the settlement happen almost at the same moment, there are fewer intermediaries, and the cost is close to cost price. The difference in the economics is enormous: in the first case about two percent leaves the trader's revenue, in the second a fraction of a percent. The difference in protection is just as enormous and runs the other way: where settlement is instant and final, it cannot be disputed.
Where the money comes from here
A card network earns basis points on somebody else's turnover while holding neither money nor credit risk: the banks hold the money, the banks carry the risk. The cardholder's bank earns a charge on every operation and shares part of it with the buyer as cashback. The merchant's bank earns the difference between what it charges the merchant and what it passes up the chain. A payment company with no banking license earns interest on other people's balances and fees. The trader pays for all of it, and through the price so does the buyer. Here is why this matters to you: if you are in retail, the fee for accepting payments is a variable you can manage by choosing the rail, not a given.
What people usually get wrong
The common belief. Cashback is a gift from the bank for your loyalty.
What is actually true. It is a share of the charge the merchant's bank passes to the cardholder's bank. In Europe that charge was capped — and the generous programs there disappeared almost at once.
The common belief. The money arrived in the account, so the payment is complete.
What is actually true. Crediting and final settlement are different events. Sometimes a bank shows the recipient the money before the settlement is actually closed, lending to them briefly against the message that arrived.
The common belief. Fast payments are safer than old ones.
What is actually true. They are final, and there is no mechanism for disputing them. The speed of settlement is also the fraudster's speed.
After this chapter you will be able to
- spread authorization, clearing and settlement out in time and name who finances the gap between them
- choose between saving liquidity and intraday risk, comparing net settlement with gross
- judge the price of irrevocability and see why on fast rails protection moves to the moment before sending
- count an institution's income from other people's balances and check what exactly protects those balances
- choose a rung on the license ladder by weighing speed to launch against whose customer it is and where their float sits
Check yourself
Who ends up paying for your card cashback?
The trader, and through the price the buyer.
The merchant's bank passes a charge for the operation to the cardholder's bank, and part of it comes back to the holder as bonuses. Where that charge was capped by law, generous bonus programs disappeared almost at once.
Why is netting cheaper than settling every payment separately?
Because real money is needed only for the difference.
Opposing payments cancel each other out, and at the end of the day only the balance is transferred. The price of that saving is the risk built up inside the day: if a participant does not survive until evening, the whole web of mutual obligations has to be recalculated.
A payment company holds your money in a wallet. Is that the same as a deposit at a bank?
No.
That kind of license allows them to hold and move other people's money but forbids them to lend out of it. A wallet balance is usually not insured, and the first question to ask a service is where that money physically sits and whether it is separated from the company's own money.
In short
When you pay by card, about two percent leaves the seller's revenue, and part of that money comes back to you as bonuses. In some countries the state has built cheap fast rails, and a payment came to cost next to nothing. Speed has a flip side: such a payment is final, and it cannot be reversed the way a card payment can. Companies that hold your money in a wallet are usually not banks: they are forbidden to lend out of that money, and it is not always insured. So it is worth asking any payment service whose license it works on and where your money sits.
Reading is half the job. In the academy this chapter is worked through by posting entries: you run the operations yourself and see whether the balance sheet still balances.