TestCast is an Android app developed by Magix app dev, available for free in the Business & Productivity category. With TestCast, you can earn extra cash for each automatic test SMS message that is sent to your phone. The app runs in the background, generating test messages itself, so you don't have to do anything.

Unlike other similar money making apps, TestCast doesn't require you to watch advertisements or complete certain tasks to earn money. All you need to do is subscribe to their plan and run the TestCast SMS app. You will automatically earn real money for each test SMS received, which can be paid out via PayPal or Mpesa.

The reason why TestCast pays its users is because many Telecom SMS providers and Mobile Network Operators need to send SMS test messages to foreign countries to ensure proper delivery of their SMS. Your phone number is used to provide such testing services, and you get paid for it.

Overall, TestCast is a great way to earn extra cash without much effort. Just download the app, run it in the background, and watch your earnings grow.