You said each app comes with a hosted DB, do developers get direct access to this db or is it a big shared one? Are you planning on providing this direct access in the future? Can you disclose the exact DB (MySql/PostgreSQL/MongoDB)?

Congratulations on the launch, you are doing a good job education developers in regard to this new way of building APIs which helps everyone competing in this space (myself included) and the YC backing helps with credibility to this domain. Keep up the good work.