Open a budgeting app for the first time and within seconds it shows every account you own: the checking account at one bank, the credit card at another, the brokerage somewhere else. You never handed it a stack of statements. Behind that small moment of convenience is open banking, the set of technologies that let your bank share your data, with your permission, with apps you choose. The market built on it is growing fast. The global open banking market was estimated at $31.61 billion in 2024 and is projected to reach $135.17 billion by 2030, a compound annual growth rate of 27.6 percent, according to Grand View Research. This guide explains how open banking technologies work and what they mean for the US financial market.
Open banking is the practice of banks opening up customer data and payment capabilities, through secure software connections, to licensed third parties that the customer approves. Instead of a bank holding your financial life behind a wall, open banking lets you carry it with you to whichever app serves you best.
How open banking technologies work
The engine is the application programming interface, or API. An API is a secure, standardized way for one system to request information from another. When you connect a budgeting app to your bank, the bank exposes an API, you grant consent, and the app receives a limited, revocable key to read your transactions. It never sees your bank password, and you can switch the access off at any time.
Consent is the part that makes open banking different from the old workarounds. Earlier apps asked for your bank login and copied your screen, a fragile and risky method. Open banking replaces that with explicit permission, scoped access, and an audit trail. The same API approach that powers modern digital financial systems is what makes this safe enough to scale.
Two roles sit between you and the apps. Data aggregators specialize in connecting to thousands of banks and normalizing the data, so a single app does not have to build a separate connection to every institution. The banks, meanwhile, publish and maintain the APIs that expose accounts and payments. When the handoff works, the customer sees a clean screen; when it does not, a connection silently breaks and an app shows stale balances. The reliability of these links is becoming as important as the features built on top of them.
What open banking enables
Once data and payments can move with consent, a wave of products becomes possible. Payments is the fastest-growing segment of the market, per Grand View Research. The table below shows the main use cases.
| Use case | What it does |
|---|---|
| Account aggregation | Shows all accounts in one app |
| Pay by bank | Moves money direct from an account |
| Cash-flow lending | Underwrites loans on real data |
| Easy account switching | Carries history to a new provider |
Source: Grand View Research and MarkNtel Advisors.
A second forecast from MarkNtel Advisors puts the global market on a similar path, near $136 billion by 2030 at a 27.6 percent compound annual growth rate, with the US expected to lead. This is the infrastructure beneath much of today’s automated fintech software and the richer data that feeds decision intelligence inside lenders.
Benefits for consumers and businesses
For consumers, open banking turns financial data into a tool they control rather than something locked inside one bank. A renter with a thin credit file can prove steady income from real cash flow and qualify for a loan. A shopper can pay a merchant straight from a bank account, skipping card fees. Switching banks stops meaning starting over, because history can travel.
For businesses, the benefit is better decisions and lower costs. A lender that can see verified income and spending can underwrite faster and more accurately than one relying on a credit score alone. A merchant that accepts pay-by-bank avoids a slice of card processing fees. And a fintech can build a product on data the customer has agreed to share, rather than guessing from limited signals.
The risks of opening the data
More data moving means more places it can leak. Every new connection is a potential target, and a breach at a single aggregator can expose data from many banks at once. Consent can also be abused: a user who clicks through a permission screen without reading it may grant more access than intended, and scammers can imitate legitimate connection flows to trick people into sharing data.
Liability is the harder question. When something goes wrong across a chain of bank, aggregator, and app, it is not always clear who is responsible. US regulators have advanced rules to give consumers the right to share and revoke access to their financial data, anchored in Section 1033 of the Dodd-Frank Act, but the details of security standards and accountability are still being worked out. The convenience is real, and so is the need to get the guardrails right.
Long-term opportunities
The direction points toward consumers owning their financial data and lenders competing on what they can do with it. With the US expected to lead the global market by 2030, American banks and fintechs that build trusted, well-secured connections will set the standard for everyone else. Payments stand to gain the most, as pay-by-bank chips away at the dominance of cards.
For the US specifically, the opportunity is partly about catching up. Several markets in Europe and parts of Asia mandated open banking years ago, while the US largely let it develop through private agreements between banks and aggregators. A clearer national framework could speed adoption and standardize security, turning a patchwork of connections into dependable public infrastructure that smaller banks and startups can rely on equally.
The deeper change is a shift in power. For decades a bank’s advantage was the data it held about you. Open banking hands that data back to the customer and lets them shop it around, which rewards whoever offers the best product rather than whoever happened to hold the account first. That is a different kind of competition, and it is only getting started.
