When I'm trying to create item for the host via API, I'm get  the following error:

{{{}}
  "jsonrpc": "2.0",
  "error": {
    "code": -32500,
    "message": "Application error.",
    "data": "SQL statement execution has failed \"INSERT INTO items (name,key_,hostid,type,value_type,interfaceid,delay,master_itemid,flags,query_fields,headers,itemid) VALUES ('{$JMX.1} Heap Memory','jmx.HeapMemoryUsage.used[\"\{$JMX.1.PORT}\"]','10930','0','0','1348','60s',NULL,'0','','','74461')\"."
  },
  "id": 1
}

I try to do it via bash script with POST curl request. I use the following curl cmd options:

curl -s -k -X POST -H "Content-Type:application/json" --data "$ZabbixAPIRequest" "$ZBX_API_URL"

where:

$ZabbixAPIRequest - variable, which contain the following JSON

{{{}}
    "jsonrpc": "2.0",
    "method": "item.create",
    "params": {
        "name": "{$JMX.1} Heap Memory",
        "key": "jmx.HeapMemoryUsage.used["\{$JMX.1.PORT}"]",
        "hostid": "10930",
        "type": "0",
        "value_type": "0",
        "interfaceid": "1348",
        "applications": [
            "8293"
        ],
        "delay": "60s"
    },
    "auth": "xxxx252yyyy68fxxxa3bzzz0xxxxx",
    "id": 1
}

$ZBX_API_URL - https://zabbix.....com/api_jsonrpc.php - URL to zabbix API on our server

I've successfully created host, application for newly created host, user's macroses , first, before attempt of create item.