Why this matters

The numbers most platforms
never show you

41%

of active email addresses appear in at least one known data breach

Source: HIBP database analysis

28%

average voluntary 2FA adoption on consumer fintech platforms

Source: FIDO Alliance, 2023

0.5%

credential stuffing success rate against breach-exposed accounts

Source: ComplianceRise research

<200ms

time needed to run a breach check — most platforms simply choose not to

Source: API latency benchmarks

How it works

Three steps.
Under two seconds.

GuardBreach checks your email against publicly disclosed breach databases. Here's exactly what happens.

You enter your email

Your email is sent securely over HTTPS to the XposedOrNot API. No account is created and your email is not stored, logged, or used for any purpose beyond the lookup.

We check the database

Your email is matched against billions of compromised account records sourced from known public data breaches worldwide — including major incidents like LinkedIn, Adobe, and hundreds more.

You see clear results

You see exactly which services were breached, what data was exposed, and specific steps to protect yourself — in plain language, not technical jargon.

If your email was breached, your password is likely compromised too

Most people don't realize that a data breach almost always means attackers have access to more than just your email address. Passwords are the most commonly exposed data type — and even when they're encrypted, modern cracking tools break weak passwords in seconds.

Attackers don't just use your stolen credentials on the site that was breached. They test them everywhere — your bank, your email, your Amazon account. This is called credential stuffing and it's fully automated.

The rule of thumb: If a service you use was breached and you haven't changed your password since — assume it's compromised. Change it today on that service and everywhere you've reused it. Then enable two-factor authentication.

Common questions

Everything you need
to know

This is one of the highest-risk habits in digital security. When one service is breached, attackers use your email as a key to attempt access on every other platform — your banking app, your Amazon account, your email itself.

What to do: You don't need to change your email address. Start by enabling two-factor authentication (2FA) on your most important accounts — especially your email provider, which controls password resets for everything else. Use a password manager to create unique passwords for each service. For low-trust signups (newsletters, apps you try once), consider using a free email alias service like SimpleLogin or Gmail's + trick (e.g. youremail+netflix@gmail.com).

Not always — but treat it as if it is. Some breaches only expose email addresses, names, or non-sensitive data. But passwords are the most commonly stolen data type, and even hashed passwords can be cracked if they're weak or common.

The safest assumption is: if your email appeared in a breach and you haven't changed your password for that service since the breach date, your credentials should be considered compromised. Change the password immediately and enable 2FA. This takes five minutes and closes the risk entirely.

Credential stuffing is when attackers take email/password combinations stolen from one breach and automatically test them against hundreds of other websites. It's fully automated — bots run millions of login attempts per hour.

The success rate is low (around 0.5%) but the volume is enormous. A list of 10 million stolen credentials generates 50,000 successful account takeovers — affecting real people who lose access to their bank accounts, email, and personal data.

The only complete defense is using a unique password for every service so a breach on one site can't cascade to others.

Yes. GuardBreach sends your email to the XposedOrNot API over a secure HTTPS connection for the purpose of the lookup only. XposedOrNot's terms prohibit storing or selling query data. GuardBreach itself stores nothing — there is no database, no analytics, no tracking.

If you want additional assurance, you can review XposedOrNot's privacy policy and their open-source API code on GitHub.

It means your email doesn't appear in any publicly disclosed breaches in this database — which is good news, but not a guarantee. Not all breaches are publicly disclosed. Some are sold on private markets and never become part of public breach databases. A clean result means no known exposure, not zero exposure.

Check periodically — new breaches are discovered and added regularly. Enable 2FA on your key accounts regardless of your result. A clean check today doesn't mean a clean check in six months.

Every three to six months is a reasonable habit. Also check immediately after any major breach makes the news — even if the breached service isn't one you use directly, attackers often cross-reference email addresses across multiple databases.

The faster you find out, the faster you can act. Breaches that happened years ago still matter if you've never changed that password.

About GuardBreach

Built on research.
Built for everyone.

GuardBreach exists because the data is clear: nearly half of all active email addresses have been exposed in known breaches. Most people are never told. Most platforms don't check.

This tool is the public-facing application of a recommendation made in the ComplianceRise Fintech Credential Safety research report — that platforms have both the technical means and the obligation to detect compromised credentials at the moment of account creation, and that users deserve to know when their data has been exposed.

GuardBreach is free, open, and will remain so. No sign-ups. No ads. No data collection.

Read the research — ComplianceRise.com contact@guardbreach.com

Research foundation

41% of active emails in known breach databases

The ComplianceRise Fintech Credential Safety report (2025) found that fintech and crypto platforms silently accept compromised credentials at registration — embedding account takeover vulnerability at the moment of first login. Read the full report →

Built by

Muhammad Huzaifa

Platform safety researcher and founder of ComplianceRise, an independent platform safety and consumer protection research firm. GuardBreach is the public implementation of his credential safety research.

Data source

XposedOrNot

Breach data provided by XposedOrNot, an open-source breach monitoring platform. GuardBreach displays this data with full attribution per XposedOrNot's terms of service.