UserCheck

UserCheck is an email validation API for blocking fake user signups, especially disposable and temporary email addresses. It is built to identify and block fake email addresses so sites and applications can focus on real users.

Its email checks include disposable email detection, email forwarding detection for relay services, MX record validation, public email detection for providers such as Gmail and Yahoo, smart email suggestions for common typos, role account detection for addresses like hello@ and support@, and syntax validation against industry standards. The API can also return fields such as normalized email, domain, domain authority, domain age, MX records, MX providers, SPF, DMARC, and flags including disposable, public_domain, relay_domain, free_subdomain, alias, role_account, spam, and did_you_mean. The page also says users can choose between comprehensive email analysis or domain-only verification.

UserCheck is delivered through a RESTful HTTP API that works with any language or framework. Named integrations include WordPress, where it blocks disposable emails from forms and registrations, Laravel through a native validation rule, Zapier, and Make. The service also describes low-latency API use for real-time user authentication workflows and says it is hosted in the EU.

Pricing includes a free plan with 1,000 credits per month, 1 request per second, limited request log, unlimited user seats, and multiple API keys. Paid Pro and Enterprise plans are listed with additional features such as bulk email and domain validation, custom blocklists, provider information, webhooks, email support, priority support, security questionnaire support, a data processing agreement, an SLA, and custom legal documents on request. The site also states that the service does not sell, trade, or share data with third parties and that its services are GDPR compliant.