James WalkerChecker is an API-based tool that detects disposable emails, suspicious domains, and device fingerprints in under 200ms. Prevent fake signups, reduce server costs, and improve data quality. Easy to integrate with WordPress and AWS-backed.
Top comment
Hi Product Hunt! 👋 We built Checker to help developers and businesses fight back against fake signups and free trial abuse. Too many products suffer from spammy registrations that waste server resources, distort analytics, and hurt growth. Checker is different from basic email verifiers. It uses real-time detection (under 200ms) powered by our OmniCrawler and DomainCatch engines to block disposable emails and suspicious domain patterns. And soon, RiskyIPs will add device fingerprinting to identify multi-account abuse. What makes us proud? The API is lightning fast, developer-friendly, and already integrates with WordPress. It's designed to be powerful but lightweight — and easy to drop into any stack. We’d love your feedback and ideas — thank you for checking out Checker!
Comment highlights
Checker seems like a fantastic tool for preventing fake signups and reducing spam! The fact that it can detect disposable emails, suspicious domains, and device fingerprints in under 200ms is impressive. How does it handle users who try to bypass detection with VPNs or other privacy tools
Thanks for sharing, seems really useful!
Beyond a database of temporary emails, which other metrics does Checker use to decide which users to block?
About Checker on Product Hunt
“Detect fake signups in under 200ms with an easy-to-use API”
Checker launched on Product Hunt on June 24th, 2025 and earned 129 upvotes and 10 comments, placing #19 on the daily leaderboard. Checker is an API-based tool that detects disposable emails, suspicious domains, and device fingerprints in under 200ms. Prevent fake signups, reduce server costs, and improve data quality. Easy to integrate with WordPress and AWS-backed.
Checker was featured in API (98k followers), SaaS (41.5k followers) and Security (2.6k followers) on Product Hunt. Together, these topics include over 53.8k products, making this a competitive space to launch in.
Who hunted Checker?
Checker was hunted by James Walker. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Checker stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.