  "mempoolminfee": 0.00000000

When the minrelaytxfee is > 0.

{
    if (request.fHelp || request.params.size() > 1)
        throw std::runtime_error(
            "getrawmempool ( verbose )\n"
            "\nReturns all transaction ids in memory pool as a json array of string transaction ids.\n"
            "\nHint: use getmempoolentry to fetch a specific transaction from the mempool.\n"
            "\nArguments:\n"
            "1. verbose (boolean, optional, default=false) True for a json object, false for array of transaction ids\n"
            "\nResult: (for verbose = false):\n"
            "[                     (json array of string)\n"
            "  \"transactionid\"     (string) The transaction id\n"
            "  ,...\n"
            "]\n"
            "\nResult: (for verbose = true):\n"
            "{                           (json object)\n"
            "  \"transactionid\" : {       (json object)\n"
            + EntryDescriptionString()
            + "  }, ...\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getrawmempool", "true")
            + HelpExampleRpc("getrawmempool", "true")
        );
    bool fVerbose = false;
    if (!request.params[0].isNull())
        fVerbose = request.params[0].get_bool();
    return mempoolToJSON(fVerbose);
}
UniValue getmempoolancestors(const JSONRPCRequest& request)