The BitMEX .XMRXBT30M Index is a 30-minute TWAP of the Monero price at Poloniex ending at 12:00 UTC from the .XMRXBT Index. These values are used for settlements. The TWAP is calculated using values from the BitMEX .XMRXBT index.
.XMRXBT30M Index Historical Values
This is the 30-minute time-weighted average price of BTC_XMR on Poloniex, printed every 1 day.
The last 100 measurements are available here. More results can be retrieved from the API.