UserCheck
API that identifies and blocks disposable email addresses during user signups to prevent spam accounts.
| What is it | API that identifies and blocks disposable email addresses during user signups to prevent spam accounts. |
|---|---|
| Pricing | Freemium — from $50/mo |
| Free tier | Yes |
| Platform | API |
| API | Yes |
| Works with | Integrately, Make |
| Best for | preventing fake account creation during user registration, reducing spam and maintaining clean user databases |
| Domain registered | 2003 |
Data updated Aug. 1, 2026
What does UserCheck do?
UserCheck is an email validation API that helps websites and applications stop fake user registrations. You send an email address to its API, and it returns a detailed analysis in real-time. It checks if an address is from a disposable provider (like TempMail), a relay service, a public domain (like Gmail), or a role-based account (like support@). It also validates syntax, checks for MX records to confirm the domain can receive mail, and even suggests corrections for common typos.
The tool works by comparing submitted emails against a constantly updated database of known disposable and relay providers. What makes it stand out is the depth of its analysis; it doesn't just give a simple 'valid' or 'invalid' response. It provides a full JSON breakdown with specific flags, allowing developers to create custom rules. For instance, you could block all disposables but only flag public domains for review. It's built for scale, processing over 100 million requests with high uptime.
This is most useful for developers, product managers, and community managers who need to maintain a legitimate user base. It directly tackles problems like spam account signups that waste resources, fake leads in marketing funnels, and fraudulent signups that abuse free trials or promotions. By integrating UserCheck at the point of registration, teams can significantly reduce moderation overhead and ensure they're building a community of real people.
Key features
What makes it stand outWho is UserCheck for?
Who benefits most from this toolPricing
Free tier available — start without a credit cardFree
- 1,000 credits
- 1 requests per second
- 1,000 credits per month
- 1 request per second
- Limited request log
- Unlimited user seats
- Multiple API Keys
- UserCheck Gates
Pro
- 200,000 credits
- 5 requests per second
- 200,000 credits per month
- 5 requests per second
- 30-day request log
- UserCheck Gates
- Unlimited user seats
- Multiple API Keys
- Bulk email & domain validation
- Custom blocklist
- Provider information
- Webhooks
- Email support
Enterprise
- Custom credits per month
- Custom requests per second
- 30-day request log
- UserCheck Gates
- Unlimited user seats
- Multiple API Keys
- Bulk email & domain validation
- Custom blocklist
- Provider information
- Webhooks
- Priority support
- Security questionnaire support
- Data Processing Agreement (DPA)
- Service Level Agreement (SLA)
- Custom legal documents (on request)
Trust & presence
Gallery
Click any image to enlargeSimilar tools
Protect Your Content with our Spam API
Verified
AI API
AI-powered spam detection API — analyze emails, IPs, URLs, and free-form JSON content to block spam effectively
Emailvalidation
Verified
Sales & CRM
Email validation tool — verify single or bulk emails, remove invalid addresses, and improve campaign deliverability.
antideo
Verified
AI API
API service for IP reputation checks, email validation, and phone number verification to block spam and fake signups
EmailVerify AI
Verified
Email Marketing
AI-powered email verification tool — check single emails, clean lists in bulk, and integrate via API to boost deliverability.
Unspam AI
Verified
Email Marketing
AI-powered email spam checker that analyzes your messages before sending to improve deliverability
MillionVerifier
Verified
Email Marketing
Verify email lists, individual emails, and block temporary addresses with 99%+ accuracy.
Verifalia
Verified
Email Marketing
Email validation and list cleaning service — verify addresses in real-time or batch with 99% accuracy
MailTester.AI
Verified
Email Marketing
AI email deliverability tool — test spam score, get content rewrites, and fix technical issues before you send.
Works with Integrately
View all →
OpenAI
Verified
Models
AI platform offering ChatGPT for conversation, an API for developers, and business solutions — all powered by GPT models.
Picsart
Verified
Photo Editor
AI-powered creative suite for photo editing, design templates, and AI image generation — all in one platform.
Anthropic
Verified
Models
AI research and product company building safe, capable assistants like Claude
Happy Scribe
Verified
Transcription
AI transcription and subtitling tool — convert audio/video to text, generate captions, and translate in 120+ languages.
Aircall
Verified
Customer Service
AI-powered business phone system with live call coaching, automated workflows, and 24/7 AI agents for customer support.
Trello
Verified
Productivity Tools
AI-powered project management tool to organize tasks, track progress, and collaborate with teams using boards, lists, and cards.
Wrike
Verified
Productivity Tools
AI-powered enterprise work management platform that automates tasks, provides insights, and coordinates teams.
Brevo
Verified
AI Marketing
All-in-one marketing platform with AI — send emails, SMS, automate campaigns, and manage customer relationships in one place.