Why read-only bank access matters

“Connect your bank” is a vague phrase. It can mean reporting, or it can mean movement. Those are different trust decisions, and most connect screens don’t make the difference obvious.

Read-only vs payment permissions

Read-only access (balances, transactions, holdings) lets an app show you information and fill a spreadsheet or dashboard. It can see what happened. It cannot make anything happen.

Payment or write permissions can initiate transfers. That’s a much higher bar, appropriate for bill pay and brokerage funding, and not required for budgeting sync. If a tool whose entire job is showing you your spending asks for the ability to move money, that’s worth a question.

Sheetful’s bank connections and Prismfolio’s brokerage connections are both built around read access to data you choose to link. Neither is a substitute for your bank’s bill pay, and neither is trying to be.

Why the distinction matters

The blast radius of a compromised budgeting app should be embarrassment and the rotation of a token, not an unexpected wire. Scope is the part of security you can reason about without knowing anything about the vendor’s infrastructure: an access grant that has no transfer capability cannot be used to transfer, regardless of who ends up holding it.

Architecture can’t eliminate risk. A read-only breach still exposes your transaction history, which is genuinely sensitive. But it caps the worst case at disclosure rather than loss, and that ceiling is worth choosing deliberately.

How to tell what you granted

The connection screen usually lists permissions in plain language before you approve. Read it. Aggregators like Plaid present the specific products an app requested, and “transactions” and “auth” are not the same grant.

After the fact, two places hold the record: the aggregator’s own portal, and your bank’s third-party access or connected-apps page. The bank’s view is the authoritative one, because it shows every grant regardless of which aggregator brokered it.

What you should still do

• Use unique passwords, and SSO or a password manager where possible
• Turn on two-factor authentication at the bank, not just at the app
• Review connected apps annually, in both the Plaid portal and your bank’s third-party access pages
• Disconnect tools you stopped using, including trials you abandoned
• Treat a tool that asks for your banking password directly, outside an aggregator flow, as a hard no

That last one matters most. Credential sharing hands over everything at once and leaves no way to revoke a single app.

Revoking is the underrated step

Access granted in 2023 is still access today. Most people connect more apps than they remember, and abandoned tools keep syncing quietly. Revoking takes a minute per connection and shrinks your exposure permanently, which is a better return than almost anything else on a security checklist.

Privacy isn’t a slogan. It’s what the token is allowed to do when nobody’s watching.