---
title: "Account Takeover Protection: Stop ATO Fraud"
description: "Block credential stuffing, brute-force and bot logins at the edge with behavioral detection, leaked-credential intelligence and progressive challenges, so real users sign in untouched."
canonical_url: https://optimi.com/en/security/account-takeover
md_url: https://optimi.com/en/security/account-takeover.md
last_updated: 2026-09-04
---

# Account Take Over

Stop attackers from hijacking your users' accounts: credential stuffing, brute-force and bot logins are blocked at the edge while real users sign in untouched.

Account takeover (ATO) is when attackers gain control of legitimate user accounts to commit
fraud. They lean on **credential stuffing** with breached username and password lists,
**brute-force and password spraying**, **phishing**, **session hijacking** and **MFA-bypass**
attempts. Our **ATO protection** inspects every login and authentication request at the edge,
so credential attacks are stopped before they reach your origin and genuine users sign in
without friction.

*Credential attacks and bot logins are filtered at the edge, closest to the source, legitimate sign-ins continue to your origin.*

- Real users (Signing in)
- Credential stuffing (Breached lists)
- Bot login attempts (Brute-force)
- Optimi Edge
- Users sign in (Accounts stay safe)
- Takeover blocked (Stopped at the edge)

## Defend the login, protect the account

- **Stop credential attacks** — Behavioral and bot detection on your login and authentication endpoints identifies credential stuffing, brute-force and password spraying, then blocks them before a single guess reaches your origin.
- **Know compromised credentials** — Leaked-credential intelligence flags sign-ins that use username and password pairs from known breaches, so an account is protected even when the password is technically correct.
- **Frictionless for real users** — Device and session fingerprinting and anomaly detection separate humans from automation. Legitimate users log in untouched while suspicious attempts face progressive challenges.

> **One breach, many accounts**
>
> Users reuse passwords, so a breach elsewhere becomes an attack on you. Edge detection and
>   leaked-credential intelligence stop stuffing campaigns before they turn into fraud, stolen
>   funds and chargebacks.

## Main features

- **[Bot detection on login](/en/security/bot-management)** — Behavioral analysis tells real users apart from automated login traffic.
- **Credential-stuffing protection** — Breached username and password lists are detected and blocked at the authentication layer.
- **Leaked-credential intelligence** — Known compromised credentials are flagged so risky sign-ins are challenged or denied.
- **[Rate limiting on auth](/en/security/rate-limiter)** — Brute-force and spraying are throttled on your authentication endpoints.
- **Device & session fingerprinting** — Anomalies in device and session signals expose hijacking and MFA-bypass attempts.
- **[Layered with the WAF](/en/security/waf)** — Works alongside the WAF to cover the full path from request to login.

## Related guides
- [web-security](/en/guides/tags/web-security)
- [api-security](/en/guides/tags/api-security)

[Get in touch](/en/contact): Worried about account takeover? — Talk to our team about stopping credential stuffing and bot logins at the edge, before they reach your accounts.