You can search here: https://developer.atlassian.com/display/JIRADEV/JIRA+Agile+Development.
You can also find tutorials here: https://developer.atlassian.com/display/JIRADEV/JIRA+REST+API+Tutorials
I hope this helps
None of the above links provide info on the greenhopper / agile API calls - the first link just talks about the Java API reference. I think you want
https://jira.atlassian.com/plugins/servlet/restbrowser#/ - make sure you uncheck the box at the top.
We're pleased to announce that JIRA Agile now has a public REST API. The new officially supported REST API includes a number of improvements over the old private JIRA Agile REST APIs:
Check out the documentation for the latest version here: https://docs.atlassian.com/greenhopper/REST/cloud/
If you are currently using the private JIRA Agile REST API, see the instructions below:
If you have problems using the new JIRA Agile REST API, create an issue in the ACJIRA project on ecosystem.atlassian.net (not the issue tracker shown at the top of this page).
Technical writer, JIRA ecosystem
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