Block Inc.'s business model is organized around two primary ecosystem platforms — Square for merchants and Cash App for consumers — each of which monetizes through multiple revenue layers that create compounding value as customer engagement deepens. Understanding Block's economics requires looking past the gross revenue headline to the gross profit contribution of each segment, because the Bitcoin revenue that dominates gross revenue carries negligible margin while the subscription and services revenue that is smaller in absolute terms carries margins above 70 percent. The Square ecosystem serves approximately 4 million active sellers globally, ranging from single-location food trucks to multi-location restaurant chains and retail businesses. Square's original card-present payment processing — where a merchant accepts a card through Square hardware — generates transaction-based gross profit through the spread between the fee charged to the merchant (typically 2.6 percent plus $0.10 per swipe) and the interchange cost paid to card networks and issuing banks. This payment processing revenue is high-volume and relatively low-margin per transaction, but it creates the data relationship and customer trust that enables Square to sell higher-margin products. The higher-margin Square products are where the business model's leverage resides. Square Loans — short-term working capital advances repaid through a percentage of daily card sales — generate interest and fee income from a customer base that Square understands intimately through its payment processing data. The lending decision is not based on credit score or financial statement analysis but on the actual daily sales history processed through Square, making underwriting both more accurate for Square and more accessible for merchants who lack the documentation history that conventional small business lenders require. Square has originated over $15 billion in loans to small businesses since launch, with loss rates substantially below conventional small business lending benchmarks because the repayment mechanism — daily card sales percentage — aligns repayment capacity with actual business performance. Square Payroll, Square Appointments, Square for Restaurants, Square for Retail, and the broader Square software suite generate subscription revenue from merchants who want specialized business management features beyond payment processing. This subscription revenue — now a meaningful component of Square's contribution — is structurally superior to transaction revenue because it recurs monthly regardless of payment volume, creating earnings stability through seasonal and economic fluctuations in merchant sales activity. Cash App's business model operates on a different economic logic. The platform's approximately 57 million monthly active users generate revenue through several mechanisms: instant transfer fees (1.5 percent of the transfer amount for instant bank deposits versus the free standard 1 to 3 business day transfer), Cash Card spending interchange revenue from Visa network payments, Bitcoin trading spread (Cash App charges a fee above the mid-market Bitcoin price rather than a flat commission, creating margin that scales with Bitcoin price volatility), stock trading (commission-free but monetized through payment for order flow), and Cash App Pay (a merchant payment product that generates processing revenue when users pay at merchants using their Cash App balance). The subscription and services gross profit — which encompasses Square software subscriptions, Cash App premium features, and platform services for both ecosystems — reached approximately $2.1 billion in fiscal year 2023, growing at approximately 20 percent year-over-year and representing the highest-quality earnings in Block's portfolio. The transaction profit from payment processing was approximately $1.8 billion, growing at approximately 12 percent. Bitcoin gross profit, representing the spread Block earns on Bitcoin transactions, was approximately $1 billion despite Bitcoin gross revenue of $10.2 billion — a margin of approximately 10 percent that reflects the narrow spread on a commodity transaction volume business. The Afterpay acquisition, completed in January 2022 for approximately $29 billion in an all-stock transaction, added a buy now, pay later capability to both Square and Cash App. Afterpay's merchant network and consumer base in Australia, the UK, and North America were intended to accelerate international expansion of both Block ecosystems — Square merchants gaining access to Afterpay consumer financing, Cash App users gaining access to Afterpay's installment purchase product through the app. The acquisition's strategic logic was sound, but the timing — completed at the peak of fintech valuations before the 2022 rate rise that compressed buy now, pay later economics — resulted in significant goodwill impairment charges that weighed on reported earnings through 2022 and 2023.