Rainmaker - Rainmaker allows you to make your Google Contacts better.
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.
Shopify Pay - Give shoppers a fast, secure way to pay
dip - accountability groups for developers
Stripe iOS SDK - Accept both Apple Pay and credit card payments easily on iOS
Paymobil - A global Venmo using stablecoins