Is there a limit of number of request for the Development version?
The latest pricing/limits/rules can be found here: http://www.kinvey.com/pricing and http://www.kinvey.com/pricing-starter
Currently, for the development plan, the important limit to worry about is the number of active users - the limit is 1k/month. Also, the current limit on data storage is 30 GB.
As of now, there is no such limit on the number of requests. But, Kinvey does monitor for request/load spikes to safeguard our multi-tenant setup against disruption.
I hope this helps.