Tradier supports a couple different response formats. The way you should request a specific format is using the standard HTTP header
This is the default format of the API due to its ubiquity in the financial space. You can omit or use the following Accept header to get XML:
Note: XML format will be removed in future version of all Tradier APIs.
JSON format is lightweight and readable. It is recommended you use this format for your requests. You should use the following Accept header to get JSON: