  "mempoolminfee": 0.00000000

When the minrelaytxfee is > 0.

{
    int nCheckLevel = gArgs.GetArg("-checklevel", DEFAULT_CHECKLEVEL);
    int nCheckDepth = gArgs.GetArg("-checkblocks", DEFAULT_CHECKBLOCKS);
    if (request.fHelp || request.params.size() > 2)
        throw std::runtime_error(
            "verifychain ( checklevel nblocks )\n"
            "\nVerifies blockchain database.\n"
            "\nArguments:\n"
            "1. checklevel   (numeric, optional, 0-4, default=" + strprintf("%d", nCheckLevel) + ") How thorough the block verification is.\n"
            "2. nblocks      (numeric, optional, default=" + strprintf("%d", nCheckDepth) + ", 0=all) The number of blocks to check.\n"
            "\nResult:\n"
            "true|false       (boolean) Verified or not\n"
            "\nExamples:\n"
            + HelpExampleCli("verifychain", "")
            + HelpExampleRpc("verifychain", "")
        );
    LOCK(cs_main);
    if (!request.params[0].isNull())
        nCheckLevel = request.params[0].get_int();
    if (!request.params[1].isNull())
        nCheckDepth = request.params[1].get_int();
    return CVerifyDB().VerifyDB(Params(), pcoinsTip, nCheckLevel, nCheckDepth);
}
static UniValue SoftForkMajorityDesc(int version, CBlockIndex* pindex, const Consensus::Params& consensusParams)