UserCheck
UserCheck: Email validation API that identifies and blocks fake and disposable email addr
UserCheck is an email validation API designed to solve the problem of fake and disposable email addresses during user signups. It helps developers automatically block temporary emails, forwarding services, and other fraudulent addresses, ensuring that only legitimate users can create accounts. The service also includes a rule-based decision engine called Gates, which combines email, domain, and IP signals to determine whether to allow, block, or challenge a signup attempt.
The core offering is a real-time email intelligence API that checks for disposable emails, relay domains, MX records, public domains, role accounts, and syntax errors. It also provides smart email suggestions for common typos. The Gates feature adds IP intelligence—detecting VPNs, proxies, Tor exit nodes, and geolocation—and allows users to build visual rules with over 30 signals. Integrations include HTTP API, WordPress, Laravel, Zapier, and Make. The service is hosted in the EU and is GDPR compliant.
UserCheck is aimed at developers and businesses of all sizes, from startups to enterprises, who want to protect their authentication flows from abuse. It offers a free plan with 1,000 credits per month and one request per second, a Pro plan with higher limits and access to Gates, and an Enterprise plan with custom credits, SLAs, and support. Pricing is seat-based with monthly credit allocations, and no credit card is required to start.
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