DSS REST API - Instrument List Cross IDs

constantin.vulpescu
constantin.vulpescu LSEG
in DSS

Client: Query and details:




I’m working as a developer for an asset management firm. I’m
task to develop java API which can communicate with the DSS Rest API. I’m
currently using Equity Search end point and Extract end point to get the information required.
Unfortunately extract end point take around 18 seconds to get the information I
need. Hopefully you would be able to point me on to right direction. My
requirement is to search security by ISIN and exchange and return security name
,Ticker, SEDOL ,RIC , ISIN , exchange and security type. I’m currently
constructing json packets based on the sample provided in sample.

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Best Answer

  • Rick Weyrauch
    Rick Weyrauch LSEG
    Answer ✓

    Instrument Lists are for when the instruments do not need to be
    fluid, that is, different on every extraction. And there are 2 additional aspects of Instrument Lists that are possible
    directly with the REST API: by calling Validate and the passing the validated results to each
    request (as opposed to identifiers):

    • Instrument Lists can be re-used across different report
      templates.
    • Instruments Lists are pre-validated.

    But then also note, because of the above, they can drift out of scope as the instrument universe changes, especially for things like a T-Bill issuance, and so periodic re-validation may be required.

    If the instruments change significantly from extraction to extraction,
    then making them into an Instrument List beforehand will not help (it is
    basically what the On Demand extractions do under the covers). But you could manage your own collection of validated instruments (which too would need to "account for universe drift") and send in the validated instruments of interest on each request.

    If the list is mostly static with only a few small edits between
    extractions, then using an Instrument List will help.

    This is also true of the report template and even Schedule if a
    regular schedule is usable for the client’s purpose. For instance, if the need were "once-a-day pricing on a fixed list of instruments at 18:00 UTC each
    workday", then a reoccurring schedule referencing a saved Report Template and
    Instrument List will get those files generated the closet to 18:00 physically
    possible each day, then one would just use the API to come some-time-after-that and pick
    up the files.

    There is no right answer, Datascope Select and the Datascope Select API have been designed to allow a wide variety of use cases to serve a very wide audience.

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