For 400 years, banking worked on a simple model: take deposits, lend money, charge the borrower more than you pay the depositor, and keep the spread. Branches handled distribution. Regulators granted licences. Customers had no alternatives. That model is being disassembled. Today, a customer’s deposits might sit at a chartered bank they have never heard of, accessed through a fintech app they use daily, with the lending done by a separate institution, the payments processed by a third party, and the compliance handled by yet another. The global banking-as-a-service market that enables this disaggregation reached $18.6 billion in 2024, according to Global Market Insights, growing at 15.1% annually toward $73.7 billion by 2034.
The Unbundling of Banking
Traditional banking bundled four functions into one institution: deposit-taking, lending, payments, and advisory. A customer went to one bank for all four. The bank cross-subsidised between them (checking accounts often lost money; mortgages and credit cards made it back). The bundle persisted because customers had no practical way to use separate providers for each function.
Fintech changed this by making each function available independently. Wise handles international transfers. Robinhood handles investing. Affirm handles point-of-sale lending. Chime handles everyday spending and savings. Each does its specific function better and cheaper than the bundled version a traditional bank offers. The customer assembles their own financial stack from specialist providers.
The Boston Consulting Group projects fintech revenues will reach $1.5 trillion by 2030, with embedded finance and digital lending accounting for the largest share of projected growth.
According to CB Insights’ 2024 fintech report, global fintech funding declined 40 percent between 2022 and 2024, pushing the sector toward consolidation and a sharper focus on profitability over growth at all costs.
This unbundling is measurable. The neobanking market, where institutions offer banking without the traditional bundle, reached $210.16 billion in 2025, per Fortune Business Insights, growing at 49.30% annually. The cross-border payments market, one unbundled function, reached $371.59 billion in 2025. Each of these numbers represents revenue that would have stayed inside traditional banks had the bundle held.
The New Banking Model: Platform, Not Institution
The model replacing the traditional bank is a platform. Rather than owning every function, the platform orchestrates specialist providers through APIs. A fintech company that wants to offer a savings account does not build a bank. It connects to a BaaS platform that provides the account infrastructure, a licensed bank that provides the charter, an identity verification provider that handles KYC, and a card issuer that provides the debit card. Each component plugs in through an API.
Banks globally process over 2 billion API calls daily, handling $676 billion in transaction value, per Coinlaw. That volume represents the plumbing of the new banking model: millions of API calls connecting specialist providers into assembled banking products.
Platform-based BaaS models account for 69% of the global market, per Global Market Insights. Cloud deployment holds 67%. The US market alone reached $5.9 billion in 2024. These numbers describe a banking model where infrastructure is shared, functions are specialised, and the customer-facing company may have no banking licence at all.
How Lending Is Being Reinvented
Lending has been the most profitable part of traditional banking and the area where fintech reinvention is most disruptive. The traditional lending model relies on credit bureau scores, income documentation, and human underwriting committees. The process takes days to weeks. Approval rates for thin-file borrowers (those with limited credit history) are low.
Fintech lenders have rebuilt this process around data and algorithms. Companies like Upstart, Kabbage (now part of American Express), and Funding Circle analyse transaction data, cash flow patterns, and behavioural signals to make lending decisions in minutes. Their models assess risk differently from traditional scorecards, often approving borrowers that banks would decline while maintaining comparable or lower default rates.
Buy-now-pay-later (BNPL) is the most visible lending reinvention. Affirm, Klarna, and Afterpay offer point-of-sale instalment loans with instant approval, no interest (in many cases), and seamless integration into the checkout flow. The customer experiences a payment option, not a loan application. The merchant pays a fee to the BNPL provider, similar to a credit card interchange fee but typically higher.
Revenue-based financing for small businesses is another reinvention. Instead of fixed monthly payments on a traditional loan, the business repays as a percentage of daily revenue. Revenue is high: repayment is high. Revenue drops: repayment drops. This model, used by Stripe Capital, Square Loans, and Shopify Capital, aligns the lender’s interests with the borrower’s cash flow in a way that traditional term loans do not.
How Deposits Are Being Reinvented
The deposit side of banking is changing more slowly but no less significantly. Traditional banks gathered deposits through branch networks and paid low interest rates, relying on customer inertia to prevent outflows. For decades, this worked. Customers rarely moved banks because the process was cumbersome and the alternatives were identical.
Fintech has attacked both sides of that equation. Account portability is now trivial: a customer can open a new account in five minutes and redirect their salary in a single payroll change. And the alternatives are no longer identical. When Chase UK offered 5.1% on savings and high-street banks offered 1.5%, the competitive pressure forced rate increases across the market.
Deposit aggregation platforms like Raisin allow customers to spread their savings across multiple banks to maximise interest rates and deposit insurance coverage, without opening accounts at each bank individually. The platform handles the administrative work. The customer gets the best rates. The banks that offer competitive rates get the deposits. Those that do not lose them.
What the Reinvented Model Looks Like
The banking model that fintech is building has several distinct characteristics. Financial products are distributed through the platforms where customers already spend time (shopping, working, socialising), not through dedicated banking channels. Infrastructure is modular and assembled from specialist providers rather than built internally. Pricing is transparent and competitive because customers can switch providers in minutes. Data, not relationships, drives credit decisions.
The licensed bank remains necessary. Someone must hold the charter, maintain regulatory compliance, and provide deposit insurance. But the bank’s role has shifted from the primary customer-facing institution to an infrastructure provider. The customer relationship increasingly belongs to whoever builds the best product experience, which in many cases is a fintech company running on a bank’s infrastructure rather than the bank itself.
The reinvention is incomplete. Complex banking functions (trade finance, syndicated lending, treasury management) remain firmly in the hands of traditional institutions. But for consumer banking and small business banking, the model has already changed. The question is not whether fintech will reinvent banking but how much of the traditional model will survive the reinvention.
