USPS Shipping API

I need to do USPS shipping from within my Rails app. Before I reinvent
the wheel, is there anything out there already?

I’m familiar with the Shipping gem that has support for Fedex and UPS so
far, and came across a post on Robby on Rails’ blog that he might be
adding USPS support to it back in April. Does anyone know if that or
anything similar has ever came to fruition?

Thanks!

-Pawel