Hello @brian.keating,

You can use the Search/Historical Chain Resolution endpoint to get the chain constituents for your date range.

Thank you for replying @Gurpreet

I did try this with the sample .net project and a few different chains that I'm permissioned to see in the web portal, however I get a forbidden exception when trying via the API, I'm not sure why.

Hello @brian.keating,

Historical Chain Resolution is only available to TickHistory users. The error message shows that you are not entitled to invoke this API call. You can speak to the LSEG account manager to get additional permissions, or you can use the Terms and Conditions extraction request from the ExtractWithNotes and specify RIC as the field that needs to be extracted in the output. This will lead to the expansion of the chain.

For e.g.:

{
  "ExtractionRequest": {
    "@odata.type": "#DataScope.Select.Api.Extractions.ExtractionRequests.TermsAndConditionsExtractionRequest",
    "ContentFieldNames": ["RIC"],
    "IdentifierList": {
      "@odata.type": "#DataScope.Select.Api.Extractions.ExtractionRequests.InstrumentIdentifierList",
      "InstrumentIdentifiers": [{
          "IdentifierType": "ChainRIC",
          "Identifier": "0#HO:"
        }
      ],
      "ValidationOptions": {
        "AllowHistoricalInstruments": true,
        "AllowInactiveInstruments": true,
        "AllowOpenAccessInstruments": false
      },
      "UseUserPreferencesForValidationOptions": false
    }
  }
}

Tnx again @Gurpreet apreciate your responses, seems I dont have permission for the ExtractWithNotes either, I'll get the correct person to follow up with the Account Manager

tnx again for all your help.