Hello @roroian

DSS request supports single indentifier as a parameter to FuturesAndOptionsSearch.

One can verify the complete spec on any request via

Datascope Reqference Tree

However,

The identifier can be wildcarted, for example:

{
    "SearchRequest": {
        "FileCodes": null,
        "CurrencyCodes": null,
        "ExchangeCodes": null,
        "StrikePrice": {
            "@odata.type": "#ThomsonReuters.Dss.Api.Search.NumericRangeComparison",
            "From": 85,
            "To": 88
        },
        "ExpirationDate": {
            "@odata.type": "#ThomsonReuters.Dss.Api.Search.DateValueComparison",
            "ComparisonOperator": "GreaterThanEquals",
            "Value": "2016-12-31T00:00:00.000Z"
        },
        "IdentifierType": "Ric",
        "Identifier": "IB*"
    }
}

Would yield resulting rics starting with IB*, such as

...
{
            "Identifier": "IBMM172008500.U",
...
            "Identifier": "IBMA172008500.U",
...  

If this does not work for your requirements, you may want to look at HistoricalBulkSearch and HistoricalCriteriaSearch, that may be a better fit.