Yes, it's safe to link your bank account through a reputable financial data aggregator. At most major banks it's safer than it feels. You log in on your bank's own site, and your password never passes through the aggregator. Most apps that read account data rely on one of these aggregators, and Truthifi itself connects through three of them (Plaid, Yodlee and ByAllAccounts). Their published security pages (Plaid, Finicity, MX; Yodlee and ByAllAccounts in our Sources) describe strong encryption and independent audits. This guide, part of our education library, explains how account aggregation works, walks through the main aggregators, and shows how to stay in control.

Key takeaways

• A financial data aggregator is the secure middle layer that lets an app read your account data with your permission, usually through encrypted, revocable connections.

• Plaid, Yodlee, Finicity, MX and ByAllAccounts have broadly similar security engineering. They differ in ownership and data use, which this guide compares.

• Linking is generally safe with reputable apps, and you can revoke a connection at any time.

What is account aggregation, and how does linking your bank account work?

A financial data aggregator is the infrastructure that lets an app you use connect to your bank or brokerage and read your balances and transactions with your permission. This is what people mean by account aggregation, or financial data aggregation: many accounts, read into one place. When you see the "link your bank" screen inside a budgeting tool, a brokerage, a payment app, or Truthifi, a bank data aggregator is usually doing the work behind it. So asking are budgeting apps safe really means asking about the aggregator behind that screen.

Three things make modern aggregation safer than the screen-scraping of a decade ago:

• OAuth / direct APIs at major banks. At large institutions you authenticate on your bank's own website; the aggregator receives a token, not your username and password.

• Tokenization + encryption. Connected apps receive a token instead of your raw login, with data encrypted both in transit and at rest (typically AES-256 / TLS).

• The industry is standardizing. Regulators and aggregators appear to be converging on the Financial Data Exchange (FDX) API and phasing out password-based screen-scraping. The CFPB's open-banking rule (Section 1033) remains unsettled. A federal court put its compliance dates on hold in 2025. According to the Federal Register notice (2025), the CFPB opened a reconsideration of the rule in August 2025 and is rewriting it.

Whichever bank account aggregator sits behind a link screen, the same four control questions decide your safety. Is the connection read-only? Are credentials stored? Can you revoke it? And how is the data used?

For this comparison, Truthifi connects through Plaid, Yodlee and ByAllAccounts, and it doesn't sell your personal information.

→ See Truthifi plans and pricing

The major aggregators at a glance

Plaid, Yodlee, Finicity, MX and ByAllAccounts all encrypt data and use OAuth or token-based connections where banks support them. Their security engineering is broadly similar. What sets them apart is ownership and how they handle data, detailed below. Security is covered in the table, and data use is covered in the notes beneath it.

Data-use background. Full detail and sources are available in each linked guide.

• Plaid: says it doesn't sell or rent your financial data; a 2022 privacy settlement strengthened its user controls, a pro-consumer outcome. Full guide →

• Yodlee: says it doesn't sell data that identifies you; like many aggregators it provides de-identified, aggregated data for research. A privacy class action against Yodlee saw most claims resolved on summary judgment in 2025, with one surviving claim settled; no court found Yodlee liable. Envestnet sold Yodlee to the private-equity firm STG in September 2025. Full guide →

• Finicity: Mastercard-owned, with a consent-first, privacy-driven design and a public data-responsibility commitment that puts you in control of your data. A privacy case raised over its data practices was resolved in 2025 with no court finding against Finicity. Full guide →

• MX & ByAllAccounts: MX's privacy notice says it doesn't sell or share personal information beyond the website identifiers and activity data its ad and analytics partners collect; ByAllAccounts is investment-focused and owned by Morningstar.

Plaid, Yodlee, Finicity, MX and ByAllAccounts each have a full guide; the key points for MX and ByAllAccounts are summarized in the sections below, with a link to each full guide.

Also out there: Akoya, a data-access network, and Fiserv AllData are US aggregators that mostly work behind the scenes for banks and fintechs. You'll rarely see their names on a link screen. Both operate on the same model: read-only, consent-based, token/API access.

Is MX safe?

Short answer: yes. MX is a security- and privacy-forward data aggregator that states it does not sell your personal data. MX connects banking apps to financial institutions and markets itself on a privacy-first stance. According to its trust page, it encrypts data at rest with AES-256 and in transit with TLS 1.2, has a SOC 2 Type II report (updated annually), and supports OAuth 2.0 credential-free connections you can approve, manage, and revoke. Per its trust and privacy pages, that no-sale stance carries the same nuance that applies to Plaid and Yodlee: it may use de-identified, aggregate data for research and benchmarking. Run it through the same checks you'd apply to any aggregator.

(Note: MX is a capable aggregator, but Truthifi does not use MX. Truthifi connects through Plaid, Yodlee, and ByAllAccounts. This section is here for completeness.) Read the full MX guide →

Is ByAllAccounts safe?

Short answer: yes. Like Plaid and Yodlee, ByAllAccounts is one of Truthifi's connection partners. It's an investment-focused data-aggregation service for portfolio and holdings data. Morningstar describes it as used by advisors and wealth platforms to read investment accounts. Morningstar and FinTech Global describe its scale in approximate, company-reported figures: a data network of about $1 trillion in assets, 200 ready-made custodial data feeds and 6,000 wealth management firms served (Morningstar; FinTech Global). Unlike consumer-banking aggregators, ByAllAccounts specializes in investment data such as holdings, positions and cost basis. ByAllAccounts is owned by Morningstar. According to WealthTech Strategy (2026), Morningstar says ByAllAccounts continues to operate as a business within the company. It's the aggregator that matters specifically for investment accounts, and it's one of the three connection partners Truthifi uses, alongside Plaid and Yodlee. Read the full ByAllAccounts guide →

The aggregators above handle the secure connection. Once you link your accounts, we bring them into one Truthifi view and check them for fees, concentration and other issues. Run a free Truthifi checkup to see for yourself → (limits apply).

How to stay in control of your connected accounts

Every app you've linked holds its own connection. Revoking one app doesn't revoke the others, unless you use an aggregator portal such as my.plaid.com that lists the apps connected through that aggregator. So the useful audit runs app by app, not aggregator by aggregator:

1. List the apps. Write down every app that has ever asked you to link a bank or brokerage.

2. Revoke inside each app. Open each one's connected-apps settings and remove the links you no longer use.

3. Check your bank and the aggregator portal. Review your bank's own connected-apps settings, plus an aggregator portal such as my.plaid.com where one exists.

4. Ask for deletion. Revoking access stops new data from flowing, but it doesn't erase what an app already copied. When you stop using an app, send it a deletion request as well.

What Truthifi adds on top of any aggregator

Plaid, Yodlee or ByAllAccounts delivers the raw feed; Truthifi's work starts after that. Once you connect, Truthifi cleans and organizes what each institution sends. For instance, it labels reinvested dividends correctly and matches the same security across accounts, so you and your AI assistant work from consistent numbers. That cleaning already runs on real portfolios: according to Truthifi platform data as of October 2026, it has $6B+ monitored in the accounts its users have connected.

Ask your own AI assistant about your accounts

Whether you call it AI for personal finance or AI money management, it works best from consistent numbers. That's why Truthifi cleans the data first. Connecting your own AI assistant works on every current consumer plan, including the free ones, through Truthifi's MCP server. MCP, or Model Context Protocol, is an open standard letting AI assistants connect to outside tools and data. Connect an assistant such as Claude from its own connector menu, then sign in to Truthifi and click Authorize. For most assistants there's no API key to enter, and you don't need spreadsheets or code. The built-in Truthifi AI agent is also included with Monitoring and Monitoring Plus+. Connect Truthifi to your AI agent →

Then ask: "Which of my accounts costs me the most in fees?" You see the fees on each account, by type (in your own AI assistant this needs Connect Max, Monitoring or Monitoring Plus+). Questions about your returns next to a benchmark, or your exposure to single stocks including what you hold through funds, need Connect Pro or higher, or Monitoring (compare plans on the pricing page). Truthifi is not an investment adviser and doesn't give investment, tax or legal advice. If fees are the concern, our lifetime fee calculator shows what those fees cost you over time.

Curious what your own accounts would show? Connect free and run your checkup → (Free Checkup is free, limits apply.)

One picture for investors, advisors and firms

That same cleaned picture shows how your money splits by asset class, sector, industry and country, and Truthifi checks it for fees, concentration and other issues. Truthifi automatically refreshes your data once a day, as long as the connection to your bank or broker is working.

As an investor, you see fees, performance and the Truthifi Score in one place. Working with an advisor or a firm? You can share the accounts you choose with them. Whatever you've chosen to share is visible to your advisor, and sharing can be stopped whenever you like.

There are no commissions, no ads and no advice built into the product. Monitoring starts with a free checkup and includes the built-in Truthifi AI agent; current monthly and annual prices are on the pricing page. → How Truthifi Connect works

Start free at app.truthifi.com/register (limits apply) and run a Free Checkup of your connected accounts.

Truthifi for financial advisors

Clients can be sponsored by their advisor or firm. When sponsored, a client's Truthifi plan is free, covered by the advisor or firm. Everything the client has chosen to share is visible to you, and they can cut that off at any time, keeping you both on one consistent picture.

→ Truthifi for Advisors · Request a demo

Frequently asked questions

Is it safe to link my bank account to an app?

At most major banks, yes. You log in on your bank's own site, the app receives a token rather than your password, and your data is encrypted in transit and at rest. Per their own published trust pages (for example Plaid, Finicity and MX; the rest are in Sources), the major aggregators use strong encryption and independent audits, so the technical risk is low. Data-use practices differ, though. Before you link, confirm the app only reads your data, doesn't keep your login, lets you cut access off, and says plainly whether it sells data.

Is account aggregation safe?

Generally, yes. Reputable aggregators (Plaid, Yodlee, Finicity, MX, ByAllAccounts) state on their trust pages that they use strong encryption and independent audits, so the technical risk is low. Where they diverge is data use: ownership and privacy policies differ. Read the policy of the specific app and aggregator you're about to use.

Is MX safe?

Yes, by the same checks this guide applies to every aggregator. Its no-sale data stance, the de-identified data caveat, and its encryption, audit and OAuth details are all covered in the MX section above.

Which aggregator is safest?

The honest answer is that the connection side is well covered; the bigger risk usually isn't linking an account, it's not knowing what's in it. They differ mainly in ownership and data handling: Plaid and Yodlee say they don't sell data that identifies you, Finicity (Mastercard-owned) is built on a consent-first design, MX positions itself as privacy-first, and ByAllAccounts is investment-focused and owned by Morningstar. Past privacy questions about these aggregators have been settled or closed, with no court finding of liability against any of them. To dig into any one, read its full guide and check the connecting app's current policy before you link.

How do I disconnect an aggregator?

You can disconnect through the aggregator's own portal where one exists, such as Plaid's my.plaid.com, or through the app you connected with. Revoking through the app's connected-apps settings and your bank's own settings covers most cases, and you can also ask the app to delete data it already collected. If you spot an app you don't recognize in either list, revoke it first, then send that app a deletion request.

Why add Truthifi on top of an aggregator?

The aggregator and Truthifi do different jobs. The aggregator securely connects your accounts and moves the data. Truthifi cleans and organizes that data into one household-level picture, refreshes it automatically once a day when the connection is working, and lets you connect your own AI assistant to it.

Does Truthifi reach accounts one aggregator doesn't?

No single aggregator covers everything. Truthifi isn't limited to one network: it connects to 18,000+ financial institutions through Plaid, Yodlee and ByAllAccounts, so it often reaches accounts a single aggregator alone would miss. Check your bank or broker's status at truthifi.com/connections before you link it. A connection that works today can still break when a bank changes its login or API, so if your data stops refreshing, that status page is the first place to look.

The bottom line

Security engineering is where the major aggregators look most alike; ownership and data use, covered above, are where they differ, and those are worth reading before you link. Because their encryption is broadly comparable, much of the risk that remains sits in the links you forgot you made. An old budgeting app you abandoned years ago can still hold a live token. One app-by-app pass each year, revoking what you no longer use, likely does more for your safety than switching aggregators.

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How we researched this guide

This guide draws on each aggregator's published trust and privacy pages, the court and regulatory records cited in the text, and the public reporting listed in Sources. Figures about Truthifi itself come from Truthifi platform data.

About the author

Truthifi Bot drafts these guides from Truthifi's data and public sources. Every page is reviewed by the Truthifi Team before publishing.

Reviewed by the Truthifi Team

Read next from the Truthifi blog

• Is Plaid safe?: the largest consumer aggregator, and what it does with your data

• Is Yodlee safe?: one of the oldest aggregators, and how it handles data

• Is Finicity safe?: Mastercard-owned, consent-first open banking

• Is MX safe? · Is ByAllAccounts safe?: the privacy-first and investment-focused aggregators

• How Truthifi Connect works · Connect Truthifi to your AI agent: read-only and revocable

• Lifetime fee calculator · All Truthifi education guides

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Sources

Sources on the aggregators: trust/privacy pages for Plaid, Finicity, MX trust / MX privacy, Yodlee, and ByAllAccounts. We also drew on public reporting on the Plaid privacy settlement (2022), the Envestnet | Yodlee privacy case, where most claims were resolved on summary judgment in 2025 and the one surviving claim was settled, with no finding of liability, and the Finicity privacy case resolved in 2025 with no court finding against Finicity. Morningstar's statement that ByAllAccounts continues to operate within the company is from WealthTech Strategy. Questions: support@truthifi.com.

Disclaimer

General information, not legal or financial advice. Verify against each provider's current policies.

Plaid, Yodlee, Finicity, MX, and ByAllAccounts are trademarks of their respective owners. This is independent editorial content and is not endorsed by, affiliated with, or sponsored by any of them; their names are used nominatively for identification and commentary only.

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