Google Payment API - Enable an easy-to-use checkout experience for customers

Bitcoin Hero - Bitcoin trading simulator with real-time prices

Giftbit Payment API - Stripe for gift cards

Altcoin Fantasy - Learn to trade crypto and win prizes 🤑🎁

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.

Bitcoin Flip - Trading Simulator for all the popular crypto currencies.