Returns details on the active state of the TX memory pool.

{                            (json object)
  "loaded" : true|false,     (boolean) True if the mempool is fully loaded
  "size" : n,                (numeric) Current tx count
  "bytes" : n,               (numeric) Sum of all transaction sizes
  "usage" : n,               (numeric) Total memory usage for the mempool
  "maxmempool" : n,          (numeric) Maximum memory usage for the mempool
  "total_fee" : n,           (numeric) Total fees for the mempool in XEC, ignoring modified fees through prioritizetransaction
  "mempoolminfee" : n,       (numeric) Minimum fee rate in XEC/kB for tx to be accepted. Is the maximum of minrelaytxfee and minimum mempool fee
  "minrelaytxfee" : n,       (numeric) Current minimum relay fee for transactions
  "unbroadcastcount" : n     (numeric) Current number of transactions that haven't passed initial broadcast yet

> bitcoin-cli getmempoolinfo 
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "getmempoolinfo", "params": []}' -H 'content-type: text/plain;'