eBay is building the infrastructure and working on guidelines for the Project Echo Beta Release, due in late September or early October.

Feedback is being sought on Project Echo participation criteria, which will be based on principles of trust, reliability, and great customer experience. Developers can post their feedback in a Project Echo forum thread.

Project Echo is an initiative to open up eBay to applications created by third-party developers, starting with the Selling Manager section of My eBay. It was announced at the eBay Developer's Conference in June this year.