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.}