If verbose=false, returns a json object with transaction list and mempool sequence number attached.
Returns (for verbose = false)
[ (json array)"hex", (string) The transaction id ...]
Returns (for verbose = true)
{ (json object)"transactionid": { (json object)"vsize": n, (numeric) virtual transaction size as defined in BIP 141. This is different from actual serialized size for witness transactions as witness data is discounted."weight": n, (numeric) transaction weight as defined in BIP 141."fee": n, (numeric) transaction fee in BTC (DEPRECATED)"modifiedfee": n, (numeric) transaction fee with fee deltas used for mining priority (DEPRECATED)"time": xxx, (numeric) local time transaction entered pool in seconds since 1 Jan 1970 GMT"height": n, (numeric) block height when transaction entered pool"descendantcount": n, (numeric) number of in-mempool descendant transactions (including this one)"descendantsize": n, (numeric) virtual transaction size of in-mempool descendants (including this one)"descendantfees": n, (numeric) modified fees (see above) of in-mempool descendants (including this one) (DEPRECATED)"ancestorcount": n, (numeric) number of in-mempool ancestor transactions (including this one)"ancestorsize": n, (numeric) virtual transaction size of in-mempool ancestors (including this one)"ancestorfees": n, (numeric) modified fees (see above) of in-mempool ancestors (including this one) (DEPRECATED)"wtxid":"hex", (string) hash of serialized transaction, including witness data"fees": { (json object)"base": n, (numeric) transaction fee in BTC"modified": n, (numeric) transaction fee with fee deltas used for mining priority in BTC"ancestor": n, (numeric) modified fees (see above) of in-mempool ancestors (including this one) in BTC"descendant": n (numeric) modified fees (see above) of in-mempool descendants (including this one) in BTC },"depends": [ (json array) unconfirmed transactions used as inputs for this transaction"hex", (string) parent transaction id ... ],"spentby": [ (json array) unconfirmed transactions spending outputs from this transaction"hex", (string) child transaction id ... ],"bip125-replaceable":true|false, (boolean) Whether this transaction could be replaced due to BIP125 (replace-by-fee)"unbroadcast":true|false (boolean) Whether this transaction is currently unbroadcast (initial broadcast not yet acknowledged by any peers) }, ...}
Result (for verbose = false and mempool_sequence = true)
{ (json object)"txids": [ (json array)"hex", (string) The transaction id ... ],"mempool_sequence": n (numeric) The mempool sequence value.}