Built for product-led teams

Email Verification for SaaS & Technology

Stop fake signups before they reach your database.

A throwaway address in your signup form is not just a bad row in a table. It is a trial that never converts, an onboarding sequence that bounces, and a sender reputation that quietly erodes. ClearBounce checks every address the moment it is typed.

Start with 100 free credits View pricing

10M+ verifications · 99.5% accuracy · 4.9/5 rated · No credit card required

What we found in 807,203 verifications · H1 2026

75.9%

Deliverable

10.2%

Invalid

8.7%

Risky

8.1%

Catch-all

80% of the lists we processed were at least 20% unusable. See the full benchmark data

Why SaaS teams run every signup through ClearBounce

Product-led growth lives or dies on the activation email arriving. Here is what changes when the address is verified at the point of entry.

Block disposable and throwaway signups

Free-trial abuse usually starts with a 10-minute mailbox. We flag disposable domains in real time, so the abuse never gets an account.

Protect activation and onboarding sequences

Your welcome email is the highest-stakes message you will ever send. A verified address means it lands instead of bouncing.

Keep trial-to-paid metrics honest

Invalid signups inflate top-of-funnel numbers and hide your real conversion rate. Clean data means your dashboard tells the truth.

Enforce work-email-only signups

Our result includes free-provider detection, so you can require a company address without maintaining a domain blocklist yourself.

Ship it in an afternoon

A single REST call, libraries for Node, Python, PHP, Ruby and Go, and documentation that does not send you hunting.

Pay only for what you verify

Pay-as-you-go from $4 per 1,000 emails. Credits never expire, so seasonal signup spikes do not cost you a plan upgrade.

Verify at the signup form, not after the damage

Add one call to your registration handler. The response comes back fast enough to sit inside the form submit, so an invalid address gets corrected while the user is still on the page.

Catch typos like gmial.com and yaho.com before the account is created

Reject disposable domains, role accounts and known spam traps at the door

Same API powers your in-app invite flows, waitlists and lead forms

Read the API documentation

Node.js

// app/api/register.ts
const res = await fetch(
  'https://clearbounce.net/api/v1/verify?email=' + email,
  { headers: { 'X-API-Key': process.env.CB_KEY } }
);
const { result, is_disposable, is_free } = await res.json();

if (result === 'undeliverable' || is_disposable) {
  return reply.code(422).send({
    error: 'Please use a valid work email address.'
  });
}
// ...create the account

Already sitting on years of signups?

Most SaaS databases carry a long tail of addresses collected before verification was in place. Upload the export, get a clean file back, and re-engage the part of your list that can actually receive mail.

Drag and drop a CSV, or connect your ESP directly through our integrations

Every address labelled deliverable, undeliverable, risky or catch-all

Suppress the dead weight before a re-engagement campaign, not after

When email verification becomes urgent for a SaaS business

These are the moments where a clean list stops being a nice-to-have and starts protecting revenue.

Trial abuse is climbing

The same person keeps opening new trials with disposable addresses. Real-time verification cuts off the supply without adding friction for genuine users.

Product emails are landing in spam

Password resets and invoices are transactional, but mailbox providers still judge you on aggregate bounce rates. Cleaning the list is usually the fastest fix.

You are migrating to a new ESP or CRM

Importing a dirty list into a fresh sending domain is the quickest way to burn it. Verify before the migration, not after the first send fails.

A pricing or feature announcement is going out

Company-wide sends hit the full database at once, which is exactly when a decade of accumulated invalid addresses does the most damage.

Sales is working an outbound list

Bounced prospecting mail damages the same domain your product emails go out from. Verify the list before your SDRs touch it.

You cannot explain a signup spike

A sudden jump in registrations is either a great week or a bot. Verification results tell you which one within minutes.

Works with the tools you already send from

Connect your platform and verify the list where it already lives, or use the API and skip the export entirely.

See all integrations

Pay for what you verify, keep what you do not use

Verification demand is rarely flat. It spikes when you migrate, when a season starts, when a list arrives. Pricing that assumes a steady monthly volume charges you for the quiet months too.

Credits never expire. Buy for the spike, use the balance whenever it comes up next.

From $4 per 1,000 emails pay-as-you-go, or save 20% on a subscription if your volume is predictable.

100 free credits on signup, no credit card required.

Start free

100 credits

Enough to verify a real sample of your list and see the result breakdown before you spend anything.

Create a free account Compare all plans

Questions SaaS teams ask

Will real-time verification slow down my signup form?

A single verification typically completes fast enough to run inside the form submit. If you would rather not block the request at all, verify asynchronously right after the account is created and flag the record instead.

Can I require users to sign up with a work email?

Yes. Every verification result includes a free-provider flag, so you can reject Gmail, Outlook and similar consumer domains without maintaining your own blocklist.

What happens to addresses that come back as catch-all?

Catch-all domains accept mail for any address, so no verification service can prove a specific mailbox exists there. We label them honestly as risky rather than guessing, and you decide whether to allow the signup.

Do you have libraries for my stack?

The API is a plain REST endpoint that works with any HTTP client. We publish examples for Node.js, Python, PHP, Ruby and Go, plus a WordPress plugin and Zapier, Make and n8n connectors.

How often should I re-verify existing users?

Email addresses decay at roughly two percent a month as people change jobs. For an active product database, a full re-verification every six months is a reasonable rhythm, or before any large announcement.

Related reading: How email verification actually works Disposable email addresses explained

Other industries we work with

Ecommerce & Retail

Built for online retail

Financial Services

Built for regulated senders

Agencies & Marketing

Built for teams running many lists

Travel & Hospitality

Built for guest-facing teams

Media & Publishing

Built for newsletter and subscription teams