# TRADE Message Header

The header consists of general information, which can be later used as a reference. It is structured as follows:

{% tabs %}
{% tab title="JSON" %}

```json
{
  "Header": {
    "Type": "2",
    "MsgGuid": "16c9746d-619e-4e42-b8e1-fb95251c3859",
    "ServerTimestamp": "1489578474",
    "MsgSeq": "1"
  },
}
```

{% endtab %}

{% tab title="XML" %}

```xml
<Header>
    <Type>2</Type>
    <MsgGuid>16c9746d-619e-4e42-b8e1-fb95251c3859</MsgGuid>
    <ServerTimestamp>1489578474</ServerTimestamp>
    <MsgSeq>1</MsgSeq>
</Header>
```

{% endtab %}
{% endtabs %}

### **Model**

| **Element**                                    | **Data Type** | **Description**                                                                                                                                                                                                                                                                |
| ---------------------------------------------- | ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| [Type](/u/trade/enumerations/message-types.md) | int           | The type of the message                                                                                                                                                                                                                                                        |
| MsgGuid                                        | guid          | The unique GUID of the message                                                                                                                                                                                                                                                 |
| ServerTimestamp                                | long          | Timestamp representing the current time of when the message was sent                                                                                                                                                                                                           |
| MsgSeq                                         | int           | The message sequence. The sequence is not unique, it's a sequential per type of message. For example, every market has its own sequence, every livescore message has their own sequence, not related to market messages, every resulting message have their own sequence, etc. |

`Note: all timestamps are in UTC`


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