Checker

Tired of fake signups flooding your platform and skewing your data?

Checker is the lightning-fast API-first solution built to detect and block fake users in under 200ms — before they touch your database, exploit your freemium plan, or wreck your analytics.

What Checker Does:

Checker catches disposable emails, suspicious domains, and (soon) device fingerprint abuse, helping SaaS companies, lead-gen platforms, and membership sites focus on real users — not bots or freeloaders.

With over 170,000+ known temporary email domains, a blazing-fast <200ms response time, and 99%+ detection accuracy, Checker is designed for developers who want a plug-and-play API that just works.

The Results (So Far):

  • 5M+ fake signups blocked

  • 170K+ disposable domains monitored

  • 99%+ detection accuracy

  • Trusted by 1K+ active users (and growing)

Why Teams Love Checker:

  • Protect your freemium/trial offers from abuse

  • Save on infrastructure & support by stopping fake accounts early

  • Improve marketing ROI with clean, high-quality user data

  • Plug in once and let it scale with your traffic — from day one

Checker is fully GDPR-compliant and developer-ready with clear documentation and enterprise-grade uptime.

Clean signups. Clean data. Clean growth.
Checker helps you focus on the humans, not the headaches.

👉 Start blocking fake signups in <200ms today.



Detect disposable emails and suspicious domains with 170K+ domain coverage and <200ms response time.



Save server resources and reduce support overhead by blocking junk signups before they consume bandwidth.




Get started in minutes with a plug-and-play API or WordPress plugin — plus a real-time analytics dashboard.



Eliminate fake users to unlock 99% accurate insights that improve conversions, CAC, and LTV.


Why Checker?

Because fake signups aren’t just annoying — they’re expensive.

They drain server resources, inflate infrastructure costs, skew your analytics, and exploit your freemium plans. Worst of all? They trick you into making product and marketing decisions based on noise, not truth.

Checker fixes that — in real time.

With sub-200ms API response times, 99%+ accuracy, and 170,000+ known disposable domains, Checker gives you instant protection against fake users before they ever touch your database.

It’s designed for developers, founders, and growth teams who want:

  • A clean user base

  • Accurate insights

  • Lower costs

  • And tools that just work

Key Features:

  • <200ms real-time API response - ultra-fast validation
  • OmniCrawler™ - constantly updates a 170k+ temp email domain database
  • DomainCatch - detects domain variants and sign-up abuse
  • RiskylPs (coming soon) - detects device/browser fingerprinting
  • WordPress plugin for seamless CMS integration
  • GDPR-compliant and AWS-hosted

Checker is privacy-first, scalable, and deadly simple to integrate.

You built your product for real people. Checker keeps it that way.

How It Works

The Problem with Traditional Email Checks & OTP: Why They're No Longer Enough

Standard verification methods were built for a different era — and they’re no match for today’s wave of disposable email abuse.

Checker goes beyond "is this a valid email?" and instantly flags suspicious signups using a 170,000+ domain blacklist and a blazing-fast API (<200ms).

Here’s why that matters:

  • Disposable emails are everywhere
    Tools like Temp Mail let users generate throwaway addresses in seconds — making it easy to flood your platform with fake accounts.

  • Basic email validation falls short
    Traditional checks only confirm if an email exists — not whether it’s tied to a suspicious or temporary domain.

  • OTP isn't a silver bullet
    Most disposable inboxes can receive OTPs instantly, rendering your extra step useless against determined fraudsters.

Smarter Signups, Leaner Ops: Cut Costs & Improve Performance

Fake signups don’t just skew your data — they quietly eat away at your infrastructure and margins. Checker stops the problem at the source, helping your systems and strategies run lean and clean.

Here’s how:

  •  Reduce infrastructure bloat
    Block bots, spam accounts, and fake users before they consume server bandwidth and storage.

  •  Protect your freemium model
    Prevent abuse from trial hoarders and multi-account users, ensuring fair access and sustainable growth.

  •  Make smarter decisions with clean data
    Eliminate the noise from your analytics and marketing funnels, so every insight reflects real user behaviour.

Checker keeps your platform efficient, your costs down, and your growth real.

Instant Setup, Continuous Protection: Integrate Checker in Minutes

Checker is built for speed — not just in detection, but in deployment. Whether you’re a solo dev, a growing SaaS team, or running a WordPress site, you’ll be up and running fast — with zero friction.

Here’s what makes it effortless:

  • Real-time API integration
    Plug Checker into your sign-up flow or backend systems and start filtering bad signups immediately.

  • No-code WordPress plugin
    Protect your site in just a few clicks — no custom code or dev time required.

  • Live analytics dashboard
    Monitor signups, blocks, and threat activity as it happens — stay informed, stay ahead.

Checker delivers powerful protection without slowing you down. Set it up once, and let it silently safeguard your growth — 24/7.


Checker

Your first line of defense against fake accounts! Detect fake signups in under 200ms with an easy-to-use API.

$59 $590 -90% off
Select a Plan View All Plans

✅ 30 day money back guarantee

Tired of fake signups flooding your platform and skewing your data?

Checker is the lightning-fast API-first solution built to detect and block fake users in under 200ms — before they touch your database, exploit your freemium plan, or wreck your analytics.

What Checker Does:

Checker catches disposable emails, suspicious domains, and (soon) device fingerprint abuse, helping SaaS companies, lead-gen platforms, and membership sites focus on real users — not bots or freeloaders.

With over 170,000+ known temporary email domains, a blazing-fast <200ms response time, and 99%+ detection accuracy, Checker is designed for developers who want a plug-and-play API that just works.

The Results (So Far):

  • 5M+ fake signups blocked

  • 170K+ disposable domains monitored

  • 99%+ detection accuracy

  • Trusted by 1K+ active users (and growing)

Why Teams Love Checker:

  • Protect your freemium/trial offers from abuse

  • Save on infrastructure & support by stopping fake accounts early

  • Improve marketing ROI with clean, high-quality user data

  • Plug in once and let it scale with your traffic — from day one

Checker is fully GDPR-compliant and developer-ready with clear documentation and enterprise-grade uptime.

Clean signups. Clean data. Clean growth.
Checker helps you focus on the humans, not the headaches.

👉 Start blocking fake signups in <200ms today.



Detect disposable emails and suspicious domains with 170K+ domain coverage and <200ms response time.



Save server resources and reduce support overhead by blocking junk signups before they consume bandwidth.




Get started in minutes with a plug-and-play API or WordPress plugin — plus a real-time analytics dashboard.



Eliminate fake users to unlock 99% accurate insights that improve conversions, CAC, and LTV.


Why Checker?

Because fake signups aren’t just annoying — they’re expensive.

They drain server resources, inflate infrastructure costs, skew your analytics, and exploit your freemium plans. Worst of all? They trick you into making product and marketing decisions based on noise, not truth.

Checker fixes that — in real time.

With sub-200ms API response times, 99%+ accuracy, and 170,000+ known disposable domains, Checker gives you instant protection against fake users before they ever touch your database.

It’s designed for developers, founders, and growth teams who want:

  • A clean user base

  • Accurate insights

  • Lower costs

  • And tools that just work

Key Features:

  • <200ms real-time API response - ultra-fast validation
  • OmniCrawler™ - constantly updates a 170k+ temp email domain database
  • DomainCatch - detects domain variants and sign-up abuse
  • RiskylPs (coming soon) - detects device/browser fingerprinting
  • WordPress plugin for seamless CMS integration
  • GDPR-compliant and AWS-hosted

Checker is privacy-first, scalable, and deadly simple to integrate.

You built your product for real people. Checker keeps it that way.

How It Works

The Problem with Traditional Email Checks & OTP: Why They're No Longer Enough

Standard verification methods were built for a different era — and they’re no match for today’s wave of disposable email abuse.

Checker goes beyond "is this a valid email?" and instantly flags suspicious signups using a 170,000+ domain blacklist and a blazing-fast API (<200ms).

Here’s why that matters:

  • Disposable emails are everywhere
    Tools like Temp Mail let users generate throwaway addresses in seconds — making it easy to flood your platform with fake accounts.

  • Basic email validation falls short
    Traditional checks only confirm if an email exists — not whether it’s tied to a suspicious or temporary domain.

  • OTP isn't a silver bullet
    Most disposable inboxes can receive OTPs instantly, rendering your extra step useless against determined fraudsters.

Smarter Signups, Leaner Ops: Cut Costs & Improve Performance

Fake signups don’t just skew your data — they quietly eat away at your infrastructure and margins. Checker stops the problem at the source, helping your systems and strategies run lean and clean.

Here’s how:

  •  Reduce infrastructure bloat
    Block bots, spam accounts, and fake users before they consume server bandwidth and storage.

  •  Protect your freemium model
    Prevent abuse from trial hoarders and multi-account users, ensuring fair access and sustainable growth.

  •  Make smarter decisions with clean data
    Eliminate the noise from your analytics and marketing funnels, so every insight reflects real user behaviour.

Checker keeps your platform efficient, your costs down, and your growth real.

Instant Setup, Continuous Protection: Integrate Checker in Minutes

Checker is built for speed — not just in detection, but in deployment. Whether you’re a solo dev, a growing SaaS team, or running a WordPress site, you’ll be up and running fast — with zero friction.

Here’s what makes it effortless:

  • Real-time API integration
    Plug Checker into your sign-up flow or backend systems and start filtering bad signups immediately.

  • No-code WordPress plugin
    Protect your site in just a few clicks — no custom code or dev time required.

  • Live analytics dashboard
    Monitor signups, blocks, and threat activity as it happens — stay informed, stay ahead.

Checker delivers powerful protection without slowing you down. Set it up once, and let it silently safeguard your growth — 24/7.

Pricing - Lifetime Deal - Pay Only Once

Checker – Lifetime Subscription

  • Request limit per second: 20
  • 5 API keys
  • Pro Scrape Technology
  • Unlimited Disposable Email Checks
  • Custom blacklist/whitelist
  • WordPress plugin
  • 30-day Money Back Guarantee
  • You must redeem your code(s) within 60 days of purchase
$59 $590

Checker Pro – Lifetime Subscription

  • Request limit per second: 100
  • 20 API keys
  • Pro Scrape Technology
  • Unlimited Disposable Email Checks
  • Custom blacklist/whitelist
  • WordPress plugin
  • 30-day Money Back Guarantee
  • You must redeem your code(s) within 60 days of purchase
$149 $1,490

How can I activate the deal?

After purchasing you will get a unique activation code in your mailbox. Simply follow the instructions on your email and your deal is activated!

What if I’m not 100% satisfied?

We offer a hassle-free 30-day Money Back Guarantee, just drop us a message and we will make sure to process the refund as soon as possible.

What is Checker and what does it do?

Checker is an API-focused, real-time user registration validation service that protects your registration forms from fake users. It detects temporary email addresses, suspicious domains, and soon device fingerprints, blocking fraudulent and malicious registrations with an extremely low response time of 200 ms.

Who should use Checker?

Anyone with registration forms who wants to protect them from fake users can benefit from Checker. It is ideal for e-commerce sites, SaaS platforms, content management systems, forum sites, and all web applications requiring membership.

What are the advantages of Checker?

Checker enables more efficient use of your server resources, prevents abuse in freemium models, improves the accuracy of your marketing and analytical data, ensures your advertising spending targets the right audiences, and reduces your IT costs.

How does Checker work?

Checker uses three powerful components called Pro Scrape Technology: OmniCrawler scans temporary email providers and updates our database containing more than 170,000 suspicious domains.

DomainCatch analyzes different registration attempts on the same domain.

RiskylPs (Coming Soon) analyzes users' device characteristics to detect multiple registrations from the same device.

How can I integrate Checker with my website?

Checker offers two different integration options: With API Integration, your development team can integrate the Checker API into your existing registration system using our documentation.

If you have a WordPress-based site, you can integrate Checker without any coding knowledge by installing our user-friendly plugin.

Is Checker GDPR compliant?

Yes, Checker operates in full compliance with GDPR standards and processes user data according to these standards.

Can I use Checker for multiple websites?

Yes, you can use Checker on multiple websites with a single account.

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Founder’s Note

Hey there,

We built Checker out of a real need — not just for ourselves, but for every builder, marketer, and founder who’s ever watched fake signups quietly drain time, money, and energy from their product.

We were tired of seeing clean dashboards polluted by junk data. Tired of trial abusers gaming freemium models. Tired of verification tools that looked helpful but didn’t actually catch what mattered.

So we made something different:

A tool that’s fast, accurate, and frictionless — one that helps you protect your platform at the point of entry, with response times under 200ms, 170K+ disposable domains monitored, and zero fluff.

Checker is API-first, but it’s built for humans. Whether you're a solo dev, a SaaS team, or running a WordPress site, our goal is to help you grow confidently — with clean data, healthy funnels, and a user base you can trust.

We’re just getting started, and we’re excited to grow alongside you.

Thanks for building with integrity,

— The Checker Team 💙

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