  "mempoolminfee": 0.00000000

When the minrelaytxfee is > 0.

{
    if (request.fHelp || request.params.size() != 0)
        throw std::runtime_error(
            "getblockchaininfo\n"
            "Returns an object containing various state info regarding blockchain processing.\n"
            "\nResult:\n"
            "{\n"
            "  \"chain\": \"xxxx\",        (string) current network name as defined in BIP70 (main, test, regtest)\n"
            "  \"blocks\": xxxxxx,         (numeric) the current number of blocks processed in the server\n"
            "  \"headers\": xxxxxx,        (numeric) the current number of headers we have validated\n"
            "  \"bestblockhash\": \"...\", (string) the hash of the currently best block\n"
            "  \"difficulty\": xxxxxx,     (numeric) the current difficulty\n"
            "  \"mediantime\": xxxxxx,     (numeric) median time for the current best block\n"
            "  \"verificationprogress\": xxxx, (numeric) estimate of verification progress [0..1]\n"
            "  \"chainwork\": \"xxxx\"     (string) total amount of work in active chain, in hexadecimal\n"
            "  \"size_on_disk\": xxxxxx,   (numeric) the estimated size of the block and undo files on disk\n"
            "  \"pruned\": xx,             (boolean) if the blocks are subject to pruning\n"
            "  \"pruneheight\": xxxxxx,    (numeric) lowest-height complete block stored (only present if pruning is enabled)\n"
            "  \"automatic_pruning\": xx,  (boolean) whether automatic pruning is enabled (only present if pruning is enabled)\n"
            "  \"prune_target_size\": xxxxxx,  (numeric) the target size used by pruning (only present if automatic pruning is enabled)\n"
            "  \"softforks\": [            (array) status of softforks in progress\n"
            "     {\n"
            "        \"id\": \"xxxx\",        (string) name of softfork\n"
            "        \"version\": xx,         (numeric) block version\n"
            "        \"reject\": {            (object) progress toward rejecting pre-softfork blocks\n"
            "           \"status\": xx,       (boolean) true if threshold reached\n"