Overview
One-call view of the Bitcoin mempool for a fee-estimation, monitoring or transaction-timing agent. Returns the current number of unconfirmed transactions, the total virtual size of the mempool in virtual bytes, the total fees offered by those transactions in satoshis, and a fee-rate histogram that groups pending transactions into buckets by their fee rate in satoshis per virtual byte with the virtual size in each bucket. From the total virtual size it also returns an estimate