platoseed
social micropayments
Tipjoy was a simple, social payments engine that allowed merchants to sell digital content and features, charities to raise money for causes, and individuals to give money to one another. Tipjoy was a Winter '08 Y Combinator participant.
2X YC Tipjoy W08 and YesGraph W15, with time at iRobot, Facebook, Dropbox, and Lyft. How investing in ML, automation, and robotics at Tango.vc
Mobile crowdfunding: The easiest way to collect, fundraise, and sellโฆ

Payments for platform businesses.