  "mempoolminfee": 0.00000000

When the minrelaytxfee is > 0.

{
    if (fVerbose)
    {
        LOCK(mempool.cs);
        UniValue o(UniValue::VOBJ);
        for (const CTxMemPoolEntry& e : mempool.mapTx)
        {
            const uint256& hash = e.GetTx().GetHash();
            UniValue info(UniValue::VOBJ);
            entryToJSON(info, e);
            o.push_back(Pair(hash.ToString(), info));
        }
        return o;
    }
    else
    {
        std::vector<uint256> vtxid;
        mempool.queryHashes(vtxid);
        UniValue a(UniValue::VARR);
        for (const uint256& hash : vtxid)
            a.push_back(hash.ToString());
        return a;
    }
}
UniValue getrawmempool(const JSONRPCRequest& request)