Using websocket how to Fetch options chains/data

Hello @bopanna.alemada

If you want those specific fields, you can use the WebSocket View feature to set only interested in a subset of the fields in the "View" attribute of the JSON request message as follows:

{
    'ID': 2,
    'Key': {
        'Name': ['0#SPX*.U'],
        'Service': 'ServiceName'
    },
    'View': [
        'DSPLY_NAME', 'UNDERLYING', 'EXPIR_DATE', 'STRIKE_PRC', 'PUT_CALL', 'OPINT_1'
    ]
}

If you want to get the Chain's RICs and their data, you need to get a list of RICs from the chain record, then manually subscribe to each RIC data.

You can find more detail in the following resources:

• My colleague answered in this old thread.
• Building a Chain Expander application using Websocket API and .NET Core C# article.
• Chain introduction in this Simple Chain objects for EMA - Part 1 article.

Hope this helps.