Stripe iOS SDK - Accept both Apple Pay and credit card payments easily on iOS
Pilgrim SDK by Foursquare - Location data to understand & engage with your customers
Lendflow API - The Lendflow API allows you to embed lending services into your product so you can increase engagement, improve retention and expand revenue per user.
MightySignal Top SDKs - Most used SDKs in top 200 free iOS apps. Learn what to use.
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.
Radar - Radar - Location sharing for friends and teams.