getchaintxstats

{                                       (json object)
  "time" : xxx,                         (numeric) The timestamp for the final block in the window, expressed in UNIX epoch time
  "txcount" : n,                        (numeric) The total number of transactions in the chain up to that point
  "window_final_block_hash" : "hex",    (string) The hash of the final block in the window
  "window_final_block_height" : n,      (numeric) The height of the final block in the window.
  "window_block_count" : n,             (numeric) Size of the window in number of blocks
  "window_tx_count" : n,                (numeric) The number of transactions in the window. Only returned if "window_block_count" is > 0
  "window_interval" : n,                (numeric) The elapsed time in the window in seconds. Only returned if "window_block_count" is > 0
  "txrate" : n                          (numeric) The average rate of transactions per second in the window. Only returned if "window_interval" is > 0
}