Solo - Personal kanban boards hosted on your own server
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.
$Cashtags by Square - Get paid via $cashtags for things you do online or in person
Payment Rails Payout API - Send business payments to any country in any currency.
Plasso.com - Payments made simple. Sell subscriptions & products online.
Flutterwave - 1 API for ACH, card and mobile money payments across Africa