Of all the markets being impacted by the booming API economy, perhaps none has seen as much activity and innovation as the payments space. The past several years have seen the launch of a number of disruptive and successful API-centric upstarts, including Stripe and Balanced. Meanwhile, entrenched players like PayPal and Verifone have responded with new offerings of their own.
Put your social project on the map. Or, use those already listed to find something new in an area you care about. The OpenAction Map is a well-done full-screen map mashup that shows positive work based on the location that is being impacted.