How is the gold rate measured?
Sandbox Interactive doesn't publish the gold/silver exchange rate as an API. The Albion Online Data Project (AODP) reconstructs it by polling the in-game gold market once an hour and recording the last observed bid/ask. The result is a hourly time series with one observation per server per hour.
AlbionCore caches AODP responses for Europe locally, derives OHLC candles per timeframe (1h / 4h / 1d / 1w buckets), and re-queries every five minutes when a visitor is on a related page. The chart you see above is that cache, refreshed when AODP publishes a new observation.
AODP doesn't observe traded volume, so candles render without a volume bar — by design, not omission.