AirPay VS Zcoin

Google Pay - Make secure payments right through your Android device.

Litecoin - Litecoin is a peer-to-peer Internet currency that enables instant payments to anyone in the world.

Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.

ZenCash - Keep doing what you love, we'll help you get paid.

PayGo Wallet - PayGo Wallet is a Mobile Application that offers a unique opportunity to make electronic payments.

Verge - Secure and anonymous cryptocurrency, built with a focus on privacy.