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I've used account aggregation at Schwab and First Republic Bank for several years now. I did wonder about the potential security risks, but rationalized that if the risks were significant then large banks and brokerages probably wouldn't involve themselves with the service, especially as it's likely there isn't much profit in it. Maybe I'm being too complacent about all of this.From Investopedia
What is Account Aggregation?
How Account Aggregation Works
Account aggregation usually occurs only within a single financial institution. However, certain assets held outside a financial institution may be included if the account holder has agreed to that.
Many personal finance services offer customers the ability to aggregate data from all of their savings, checking, and brokerage accounts, as well as other financial assets across all the institutions with which they do business. These services usually require that users provide account-access information, such as a username and password, for each of the accounts that they wish to include in the aggregation. Using this information, the service "scrapes" or downloads account balances and other data from each account to include in the aggregation.
However, account aggregation software is often allowed only to access balance information and transaction records. And for security reasons, many aggregation services do not permit users to make transactions from within the service.
In addition to aggregating data from savings, checking, brokerage, and other financial accounts, some aggregation services and software—particularly those used by professional financial advisers on behalf of their clients—aggregate additional net-worth data, such as recent home-value estimates. Account aggregation platforms may also categorize cash inflows and outflows.
From "The Balance"
Account aggregation services only give the software permission to view your account balances and transactions, not make transactions. If you actually want to access your money or move it, you would need to sign in to each account's website.
Additionally, the software draws on many advanced security features. For example, if you are logging on from an unknown computer or device, additional authentication will likely be necessary.
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