Open banking lets your portfolio tracker read your brokerage data directly — without storing your login credentials. Here's how the technology works, and why it matters for DIY investors.
Open banking is a system that lets financial software read your account data — with your explicit permission — directly from banks and brokerages. No screen scraping. No stored passwords. The technology uses secure, standardized APIs to transfer only the data you authorize.
Open banking was formalized in the United Kingdom under the Open Banking Standard in 2018. The European Union followed with PSD2 — the revised Payment Services Directive. In the United States, the Consumer Financial Protection Bureau (CFPB) issued a parallel framework under Section 1033 of the Dodd-Frank Act.
All three frameworks share the same core principle: consumers own their financial data. Banks and brokerages must make that data available to authorized third parties — on the consumer's request — via standardized, secure APIs.
For investors, open banking unlocks a more important shift: financial data is no longer trapped inside your brokerage's interface. Specialized tools like Ziggma can now access your Fidelity, Schwab, Vanguard, and Robinhood data directly — and do far more with it than any single brokerage dashboard can. Portfolio analysis, risk scoring, Impact Scores, and optimizer tools are built by companies whose entire focus is investment intelligence, not custody.
Open banking started in retail banking — checking accounts, savings, credit cards. Its scope has expanded to cover brokerage accounts, IRAs, 401(k)s, and investment platforms. That expansion is what makes open banking investment tracking possible.
Not every brokerage supports direct open banking APIs yet. Where direct APIs are unavailable, aggregators like Plaid and SnapTrade bridge the gap using OAuth-based connections. Ziggma works with both to maximize brokerage coverage across U.S. and Canadian brokerages.
The practical result: a Ziggma user with accounts at Fidelity, Charles Schwab, and Robinhood can see a full consolidated portfolio — holdings, performance, risk metrics, and Impact Scores — without entering a password into Ziggma's interface.
OAuth 2.0 is the authorization protocol that makes open banking secure. It lets you grant Ziggma permission to read your brokerage data — without sharing your username or password. The process takes under a minute.
Open banking comes with its own vocabulary. These are the ten terms you are most likely to encounter when connecting brokerage accounts to a portfolio tracker like Ziggma.
