Fintech
Payments economics
Payments businesses earn a thin merchant fee on volume, so cost per transaction and fraud control decide whether they make money.
Definition
A payments business moves money between accounts and charges the merchant, not the sender, a small percentage of the value transferred. That fee is the merchant discount rate.
Because the percentage is small, profitability is decided by volume and by the cost of handling each transaction. A platform that cannot keep cost per transaction below the fee loses money on every payment it processes.
Intuition
Payments is a scale business with a fixed platform and a variable cost per transaction. Growth helps only when each additional payment costs less than it earns.
When to use it
- Evaluating the economics of a payment product or wallet.
- Comparing markets where the merchant rate or cost base differs.
- Deciding whether a new feature is worth the cost per transaction it adds.
When not to use it
- As the only measure for a lending product, where credit losses dominate.
- Ignoring fraud, which is a direct deduction from a thin margin.
Formula
Merchant revenue
Revenue = Processed volume × Merchant discount rate
What the platform earns from merchants.
Formula
Net revenue
Net revenue = Revenue − (Transactions × Cost per transaction)
What is left before fixed costs and fraud losses.
Worked example
A wallet's monthly economics
A platform processes ৳5,00,000,000 at a 0.35% merchant rate. It handles 4,00,000 transactions at a cost of ৳2.50 each.
- 1
Revenue
5,00,000,000 × 0.0035 = ৳17,50,000.
- 2
Variable cost
4,00,000 × ৳2.50 = ৳10,00,000.
- 3
Net
17,50,000 − 10,00,000 = ৳7,50,000 before fixed costs and fraud.
The platform keeps ৳7,50,000 in a good month. A rise in fraud losses or cost per transaction can erase that entirely.
Common mistakes
- Confusing processed volume with revenue.
- Assuming scale lowers cost per transaction without evidence.
- Treating instant settlement as free when it changes the cost of liquidity.
How it connects
relates to
Useful to study together, in either order.
- Working capital management: Settlement timing is a working-capital decision for the merchant.