Traditional banks partner with Frode because it's too costly for them to underwrite small loans (avg. $20k). Frode's specialized tech and higher risk appetite turn this unprofitable segment into a new line of business for the banks, allowing them to focus on larger corporate clients.

Direct-to-consumer brands with high gross margins (like Casper) could afford to pay Affirm a high merchant discount rate (MDR). This subsidy allowed Affirm to offer true 0% APR loans to consumers, creating a win-win that fueled explosive growth.

Spresso, a $5M ARR SaaS company, maintains a conservative debt strategy. Leverage is kept below 10% of ARR (e.g., <$500k debt on $5M revenue) at a ~10% interest rate. The lender also received warrants for an equity position under 10%, providing a clear model for early-stage debt.

Grab leverages its rich transaction data—like a merchant's daily cash flow or a driver's income—to create proprietary credit scores. This allows it to safely underwrite loans for unbanked individuals and small businesses, a segment traditional banks avoid due to a lack of data.

While many assume high credit card rates cover default risk, actual charge-offs on revolving balances average only 5.75%. This is a significant cost but accounts for less than a third of the typical interest rate spread, indicating that other factors like risk premiums and operating costs are major drivers.

A surprisingly large portion of high credit card APRs covers operating expenses, particularly marketing. Issuers like Amex and Capital One spend billions annually on customer acquisition. This spending is passed directly to consumers, as higher marketing budgets correlate with higher chargeable rates.

A skilled service provider's pricing should target an 80% profit margin, with only 20% allocated to cost of goods. This high margin is not just profit; it's the capital engine that allows the business to fund expansion, such as hiring staff and renting space, without taking on external debt.

While typical banks earn a 1-1.2% return on assets (ROA), credit card-focused banks achieve ROAs of 3.5-4%. This exceptional profitability, driven by high interest rates, explains why the sector is so attractive to new entrants, as it is one of the most profitable areas in all of finance.

By eliminating late fees and compounding interest, Affirm removes any financial upside from borrower mistakes. This forces the company's business model to depend solely on successful repayment, demanding superior, transaction-by-transaction underwriting to survive.