Mendeley, which bills itself as the world's largest crowd-sourced research database, today announced the Mendeley API Binary Battle, challenging developers to build an application on top of Mendeley's open database of over 70 million research papers, usage statistics, reader demographics, social tags, and related research recommendations.

The prize?  $10,001. 

Modeled after Last.fm, Mendeley seeks to use its social reference manager and collaboration platform to make research more productive and transparent. This challenge is all about creating applications that open up its academic data to others.