> For the complete documentation index, see [llms.txt](https://docs.galactica.com/galactica-developer-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.galactica.com/galactica-developer-documentation/guardian-guide/create-and-issue-zkkyc/zkkyc-gip-1-1-3.md).

# Centralised Exchange (CEX) ZK certificate (GIP-6)

### Centralised Exchange (CEX) Data

The following table list the Centralised Exchange (CEX) data contained in a Galactica zkCert. These need to be collected and validated by the Guardian.

<table><thead><tr><th width="232.33333333333331">Key</th><th>Description</th><th>Technical details</th></tr></thead><tbody><tr><td><code>totalSwapVolume</code></td><td>Total volume in USD equivalent traded by the user on the exchange.</td><td>String representing a decimal number. Decimal separator is <code>.</code>, only two decimal places are taken into account — the rest is truncated.</td></tr><tr><td><code>swapVolumeYear</code></td><td>Total volume in USD equivalent traded by the user on the exchange in the last 360 days.</td><td>String representing a decimal number. Decimal separator is <code>.</code>, only two decimal places are taken into account — the rest is truncated.</td></tr><tr><td><code>swapVolumeHalfYear</code></td><td>Total volume in USD equivalent traded by the user on the exchange in the last 180 days.</td><td>String representing a decimal number. Decimal separator is <code>.</code>, only two decimal places are taken into account — the rest is truncated.</td></tr></tbody></table>