code: def stats_blast(self, blast_id=None, start_date=None, end_date=None, options=None):
          
          options = options or {}
          data = options.copy()
          if blast_id is not None:
              data['blast_id'] = blast_id
          if start_date is not None:
              data['start_date'] = start_date
          if end_date is not None:
              data['end_date'] = end_date
          data['stat'] = 'blast'
          return self._stats(data)
docs: Retrieve information about a particular blast or aggregated information from all of blasts over a specified date range.
          http://docs.sailthru.com/api/stat