1.1 Product Overview: What is Checker and What Does It Do

1.1.1 The Purpose of Checker

Checker is a software service designed to help businesses maintain genuine and reliable user data. It provides real-time solutions against common issues such as temporary email addresses during registration, fake account creation, and system abuse—particularly prevalent in SaaS and e-commerce platforms. By analyzing email addresses during the sign-up process, Checker detects and blocks the use of temporary email addresses.

1.1.2 Core Functions and Benefits

• Real-Time Verification: Through API integration, Checker identifies whether an email address is temporary at the moment of registration and takes appropriate action.

• Rich Database: It maintains an extensive database containing more than 170,000 temporary email domains.

• Low Latency: The infrastructure is optimized for rapid verification without affecting the user experience (average response time of around 100ms).

• Continuously Updated List: Daily scans add new temporary email services to the database, ensuring up-to-date protection.

1.1.3 Why the Need Arose

Temporary email services allow users to create disposable email addresses for privacy or one-time use. However, these can be exploited by malicious users to create multiple accounts, bypass free trial restrictions, or abuse promotional offers. Checker prevents such abuse, protecting businesses from revenue loss and inefficient use of system resources.