# Timeseries ID

The value of the serial number of a single asset reference rate signs the computation method used for its calculation.   

## Serial Numbers

Daily single assets are computed once a day for multiple different timezones. Each series is identified by a serial number and its suffix is uniquely defined by 

* Timezone
* Publication time
* [Methodology](https://docs.kaiko.com/formerly-vinter-indices/api/single-assets-reference-rates/broken-reference)

<table><thead><tr><th width="154.00000000000003">Suffix</th><th width="199">Timezone</th><th width="119">Publication</th><th>Methodology</th></tr></thead><tbody><tr><td>p-d</td><td>Europe/London</td><td>16:00</td><td>VAP 15:00 to 16:00</td></tr><tr><td>p-2-d</td><td>Europe/London</td><td>15:00</td><td>VFIX at 15:00</td></tr><tr><td>p-3-d</td><td>Europe/London</td><td>16:00</td><td>VAP  12:00 to 16:00</td></tr><tr><td>p-4-d</td><td>America/New_York</td><td>16:00</td><td>VFIX at 16:00</td></tr><tr><td>p-5-d</td><td>Europe/London</td><td>16:00</td><td>VFIX at 16:00</td></tr><tr><td>p-6-d</td><td>Europe/London</td><td>20:00</td><td>VAP 19:00 to 20:00</td></tr><tr><td>p-7-d</td><td>Europe/London</td><td>16:30</td><td>VAP 15:30 to 16:30</td></tr><tr><td>p-8-d</td><td>America/New_York</td><td>16:00</td><td>VAP 15:00 to 16:00</td></tr><tr><td>p-9-d</td><td>Europe/London</td><td>16:30</td><td>VFIX at 16:30</td></tr><tr><td>p-10-d</td><td>Europe/London</td><td>16:00</td><td>VFIX at 16:00 with 24H LOCF*</td></tr></tbody></table>

\*A 24-hour last observation carried forward (LOCF) is used.

{% hint style="info" %}
**VFIX**

The created\_at and timestamp are derived from the calculation time, not the trades' created\_at.
{% endhint %}

{% hint style="info" %}
**Deprecation notice**

The `c-*` series of indices is deprecated in favor of the methodologically equivalent `p-*` series.\
While existing symbols will continue to be calculated for compatibility, new series will not have a `c-*` counterpart.\
We recommend transitioning to the `p-*` denomination.
{% endhint %}