I built an image sharing utility connected to a friend's service, because I wanted to be able to directly share an image from anywhere on my phone without going on his website.
Nice. I was actually looking for a simple image host with an API that I could use for a personal project, and didn't know about Pix. Ended up using Cloudinary, which is way overblown for my needs. Maybe I'll make an iOS port of your app!
If you do so, don't hesitate to contact me so I can also advertise it, and send the information to the service's owner, a friend of mine.