The fee service is a requirement of the insight-api service (not a bitcore-node built-in service). Its primary purpose is to query a bitcoin full node for the most up-to-date miner fees for transactions. A bitcoin full node such as BTC1 or bcoin with an available RPC interface is required.
"fee": {
"rpc": {
"user": "user",
"pass": "pass",
"host": "localhost",
"protocol": "http",
"port": 8332
}
}
curl http://localhost:3001/insight-api/estimateFee