Built for SaaS signup flows
Stop spam signups before they reach your product
Stop spam and abusive signups before they reach your SaaS. SignUp Guard analyzes every email for business vs personal type, disposable risk, and abuse signals — so you only onboard real users.
No credit card required · Free plan available
Checks today
1,284
Blocked
12%
Avg. score
77
| Type | Score | Verdict | |
|---|---|---|---|
| alex@acme.io | Business | 92 | Allow |
| jane@gmail.com | Personal | 58 | Review |
| test@mailinator.com | Personal | 6 | Block |
| sam@startup.dev | Business | 89 | Allow |
One REST API. Works with any stack.
The problem
Bad signups cost more than you think
Spam registrations don't just clutter your database — they distort metrics, waste resources, and hide real customers.
Disposable emails inflate your metrics
Burner inboxes sign up, never verify, and never convert — but they still count toward MAU and skew every funnel report.
Abusive signups waste your resources
Free tiers and AI-powered features attract abuse farmers. Every fake account costs you storage, compute, and support time.
You can't tell business from noise
Personal emails flood B2B signups. Without classification, sales and success teams chase the wrong leads.
Live demo
See how an email gets scored
Try a business email, a personal inbox, or a known disposable domain. Results are instant.
Try an email check
See how SignUp Guard classifies an address in real time.
Features
Everything you need to protect signups
From classification to custom lists — one platform for signup quality.
Email intelligence
Every signup tells a story. SignUp Guard classifies emails as business or personal so you can route real buyers to sales and keep consumer noise out of your pipeline.
Learn moreDisposable detection
Catch burner emails before they pollute your product
Learn moreAllowlist & blocklist
Your rules, enforced at the door
Learn moreAnalysis history
Full visibility into every signup decision
Learn moreTeam management
Bring your team into one account
Learn moreHow it works
Three steps to cleaner signups
Connect at signup
Add one API call before account creation. SignUp Guard returns in under a second.
Get a clear verdict
Every check returns email type, a 0–100 score, and allow, review, or block recommendation.
Act in your flow
Block disposable emails, route business signups to sales, or flag suspicious addresses for review.
Built for developers
One API call. Instant verdict.
Add SignUp Guard before account creation and get structured results your signup flow can act on immediately.
Sub-second responses
Built for the signup hot path — validate before you provision accounts or send welcome emails.
Single REST call
One POST with an email address. No SDK lock-in, no batch jobs, no list imports.
Clear verdicts
Every check returns email type, a 0–100 score, and allow, review, or block recommendations.
// Request
curl -X POST https://api.signupguard.com/v1/checks \
-H "Authorization: Bearer sg_live_..." \
-d '{"email":"alex@acme.io"}'
// Response
{
"email": "alex@acme.io",
"type": "business",
"score": 92,
"verdict": "allow"
}Pricing
Simple plans that scale with you
Start free. Upgrade when signup volume grows. No hidden credits or multipliers.
Free
For side projects and early validation.
500 checks / month
- 500 email checks per month
- Business vs personal detection
- AI quality score
- 7-day analysis history
- 1 team member
Pro
For growing SaaS teams with real signup volume.
5,000 checks / month
- 5,000 email checks per month
- Custom allowlist & blocklist
- 90-day analysis history
- Up to 3 team members
- Email support
Business
For production apps with high signup traffic.
50,000 checks / month
- 50,000 email checks per month
- Unlimited analysis history
- Up to 10 team members
- Priority support
- Webhooks (coming soon)
FAQ
Common questions
Protect your signups today
500 free checks every month. Set up in minutes. No credit card required.