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My side project, OttoPost[1] does Instagram postcard mailing. It's currently using Lob's API (which has been great). There are several others too, though.

[1] https://www.ottopost.com

I made a little side project that I use to send postcards to my grandma: https://github.com/scott113341/post

It sends the requests to the Lob API directly, so you there's no price markup! $0.70 for a 4"x6" postcard and $1.50 for a 6"x11".

Years ago there was postful: http://postful.com/

And postal methods: http://www.postalmethods.com/

http://repostage.com/

These guys are doing this, as I believe are many others.