A hosted JSON database that i can Set and Get objects

https://www.firebase.com/ does not have free plan.

Direction to go seems to select NoSQL db like MongoDB or CouchDB, and then search/compare for db as service providers.

Quick search gives 10 Online Storage APIs That is file oriented APIs

• Adobe Share: Recently released online document sharing service from Adobe with a REST-based API that integrates with Flash, AIR and non-Adobe applications.
• Amazon S3, Simple Storage Service: Probably the best known storage API and a key element of Amazon’s pay-as-you-go infrastructure services.

• Box.net: The “Box Enabled” platform offers a choice of SOAP, REST or XML-POST APIs. Below is Fireloader, a Firefox extension which allows you to upload, and download photos, files and videos using a familiar FTP like interface. In this version Flickr, Picasa, Box.net and Youtube are supported.

• Cellblock: This multimedia sharing service offers a REST-based API.

• MoveDigital: File delivery and management services geared towards large files.
• Nirvanix: A newer entrant into this space, focused scalable, secure storage through their Storage Delivery Service (SDS). See their feature comparison vs. S3.
• Omnidrive: A well regarded REST-based API which has been used for a variety of interesting commercial integrations including direct access from Zoho.
• Open XDrive: AOL offers this storage serviced using a JSON-RPC protocol.
• Openomy: Experimental online storage service started in 2005 (although a quick check of this service over this past week indicated leaves some question about its current operating status).

ref https://webapps.stackexchange.com/questions/8247/seeking-online-hosted-database-web-service-with-rest-api