Checker - Detect fake signups in under 200ms with an easy-to-use API
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.
Replies
Checker
Thanks for sharing, seems really useful!
Beyond a database of temporary emails, which other metrics does Checker use to decide which users to block?
Checker
@petr_ivan
Thanks for your interest!
Beyond just relying on a database of temporary emails, Checker uses several additional metrics to detect and block suspicious users:
DomainCatch: Analyzes patterns of sign-ups using variations of the same domain. It detects unusual spikes in registrations and flags potential abuse early on.
RiskyIPs (coming soon): Assesses device fingerprints, browser versions, and IP addresses. It identifies multiple account creation attempts from the same device or IP, enhancing security against repeated fraudulent activity.
In short, Checker combines email reputation, domain behavior, and (soon) device/IP intelligence to make accurate real-time decisions about which users to block.
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
Checker
@evgenii_zaitsev1 Thanks! We're glad you see the value in Checker.
While VPNs and privacy tools can mask some signals, our upcoming RiskyIPs feature is designed to address this. It analyzes device-level data like browser version, OS fingerprint, and behavioral patterns — making it much harder to bypass detection just with a VPN.
We're also working on clustering techniques to detect repeated abuse from the same underlying setups, even if IPs rotate.
Key problem to solve - Hope to see it evolve.
Checker
@audi_liu Absolutely — solving this problem well is our top priority, and we're committed to continuous improvement. Thanks for the encouragement!
Smoopit
@james_walker76 Looks awesome for devs! We made our own API at AirLyft to find fake users, but this looks really good and something we would definitely think about using in the future.