export RPC_USER='rpcuser'
export RPC_PASS='rpcpass'
export RPC_HOST='http://localhost:18334'
export RPC_LIMIT=420
export API_HOST='localhost:8080'
export BLOCKS_PARSING_DEPTH=100

735 Gb of space (as of 8.08.2023)
8 Gb RAM
Go 1.17

Install patched btcd node client https://github.com/1F47E/btcd-fork2
Edit config to have index=1 if you want to get info about all tx, not only mempool

Testnet
/root/go/bin/btcd -u rpcuser -P rpcpass --testnet

Mainnet
/root/go/bin/btcd -u rpcuser -P rpcpass

Full mainnet sync can take up to a week.

In order to have realtime mempool info with tx fee right from the node - it should be patched.
By default getrawmempool returns unsorted list of transactions, hash only.
After patch it will return full tx info in a sorted array by time.

            _____ _____ _____ _____ _____ 
           |   __|   __|   __|   __|  |  |
           |   __|   __|   __|__   |     |
           |__|  |_____|_____|_____|__|__|
           bitcoin mempool stats