The gauge is the most XAUT-specific feature on this page — nothing like it exists on a standard gold price site. It measures the live spread between XAUT's Binance market price and the XAU spot reference (Binance XAUUSDT), displayed both in dollar terms and as a percentage. The needle sits at centre (par) when they match; it swings right into green for a premium, left into red for a discount. The range is clamped at ±1% to keep the visual meaningful — moves beyond that are extremely rare and usually signal a temporary liquidity event.
A sustained premium above 0.5% is worth watching: it typically means on-chain buyers are absorbing new supply faster than arbitrageurs can mint and sell, which can precede a spot price move. A discount below −0.3% is historically brief — the redemption floor (50 oz minimum, Switzerland delivery) is the hard backstop that prevents deeper discounts from persisting.