Attachments: Up to 2 attachments (including images) can be used with a maximum of 512.0 KiB each and 1.0 MiB total.
You can use below webservice to know your quota of usage of RICs.
Can you upload the sample node js code?
Chain Ric Intraday Download Request: "all identifiers were invalid. No Extraction performed"
DSS API on Python
DSS Java API - Extract via https proxy
Is there an API for data challenges?