You can use native Jira REST API to query Quantify data stored in a custom Jira field.

1) Identify the field name

Custom fields in Jira have the following naming convention -- customfield_10030 where number identifies a particular field. Unfortunately, number differs from one installation to another so you need to identify it first.

In order to do that, choose any existing ticket and open the URL below right in your browser. Don't forget to replace URL with your subdomain and corresponding ticket.

In the JSON response, look for Quantify under the names key:

From this example, the key for our custom field is customfield_10043

2) Query data

Now you can use Jira API knowing where to find Quantify data. Below is an example of search API that queries tickets using Jira Query Language.

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