Arthur Hayes has a new market alarm for crypto traders: EUR/JPY. The pair has started to fall, yet the Federal Reserve channels that would turn currency stress into dollar liquidity remain dormant.

The European Central Bank’s reference rate fell from 185.63 yen per euro on Sept. 1 to 181.21 on Sept. 3, a 2.38% drop. Hayes says a fall to 140 or below by June 2027 would herald a much larger increase in dollar liquidity. The latest reading still sits 29.4% above that threshold.

That distance is crucial. The exchange rate is only the first link in a sequence that runs through French sovereign and bank funding, foreign central bank dollar borrowing at the Fed, and Fed purchases of Treasury securities. Current official data show vulnerability…