# General information

### Headers <a href="#header" id="header"></a>

When interacting with any Kaiko you are expected to pass two pieces of information in a header:

* `Accept: application/json`: API responses will be in JSON format.

```
curl --compressed -H 'Accept: application/json' 'https://<api_hostname>/<endpoint>'
```

### Timestamp input <a href="#timestamp-input" id="timestamp-input"></a>

All time parameters are in UTC time zone and returned in the following ISO 8601 datetime format:

`YYYY-MM-DD`**T**`hh:mm:ss.sss`**Z**

For example:

`2017-12-17T13:35:24.351Z`

The "T" separates the date from the time. The trailing "Z" indicates UTC time.

### Exchange codes <a href="#exchange-code" id="exchange-code"></a>

Find exchange codes here: [Broken link](https://docs.kaiko.com/kaiko-indices/getting-started/broken-reference "mention").

### Instrument codes

Find instrument codes here: [Broken link](https://docs.kaiko.com/kaiko-indices/getting-started/broken-reference "mention").&#x20;