How the 30-Day Moving Average Is Calculated

The cycles minting canister (CMC, part of the NNS) fetches the ICP/XDR rate every 5 minutes from the exchange rate canister, which is our price oracle. The cycles canister also stores the start-of-day rates (UTC).

The 30-day-moving average uses the start-of-day rates for the past 30 days. Auditors look at the CMC's source code, which is publicly available here: https://github.com/dfinity/ic/blob/4344a924bcb12bc3d1510805dbb37391179df887/rs/nns/cmc/src/main.rs#L930

...and the function right below that as well: https://github.com/dfinity/ic/blob/4344a924bcb12bc3d1510805dbb37391179df887/rs/nns/cmc/src/main.rs#L964

These values are shown on the dashboard under "Conversion Rate."