Access SDP Response Information (i.e. hasMore)

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Is there a way to tell if an SDP has more data?  We are adding the ability to download SDP data to Excel, but we would like to download ALL the SDP data even though the user may only be seeing the first 25 rows.  Currently, in the download action chain, we are going through a recursive call to get all the SDP data before downloading.  However, we already have the first 25 rows.  We would like to avoid making an additional REST call to get those rows.  If the SDP already has all the data, there is no need