Overview

UserCheck is an API designed to help businesses and developers detect and block disposable (temporary) email addresses and domains in real time. By ensuring only genuine users can sign up or interact with your platform, UserCheck protects your business from abuse, improves data quality, and reduces operational costs.

What Can UserCheck Do?

• Validate Emails & Domains – Instantly check if an email address or domain is valid, active, and trustworthy.
• Detect Disposable & Spam Sources – Block temporary, throwaway, or known spam email addresses before they reach your system.
• Check Domain Reputation – Identify public email providers, relays, and suspicious domains.
• Bulk Verification – Efficiently process large lists of emails or domains.
• Custom Blocklists – Create and manage your own lists of blocked domains.

Why Use UserCheck?

• Prevent Platform Abuse – Stop free trial and promo abuse, reduce spam, and maintain authentic user communities.
• Improve Data Quality – Ensure your marketing, analytics, and support efforts reach real users, not fake accounts.
• Reduce Costs – Save resources by avoiding fake signups, improve email deliverability, and reduce fraud.
• Easy Integration – Simple REST API, clear documentation, and integrations for popular services make setup fast and developer-friendly.
• Scalable & Reliable – Built on modern infrastructure for high performance, reliability, and global reach.

Get Started

Ready to protect your platform and improve your data? Head to the Quick Start Guide to make your first API call.