The UserCheck API allows you to verify the validity of a domain by sending a simple GET request to the domain endpoint. It provides responses indicating whether the domain is valid, invalid, or if rate limits have been exceeded.
Build a signup gate that blocks disposable emails, enrich user records with domain signals, or stop spam account creation with a single call. You can use lightweight lookup endpoints for fast checks or the Gates visual engine to get allow/block decisions without writing decision logic. The free plan includes 1,000 credits per month so you can prototype quickly. Integrations and webhooks help you run this in production when you scale.
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