The euro's structural fault line. This engine answers one question: is the monetary union's bond market pricing every member as one currency, or splintering — pricing redenomination risk into France, Belgium and the periphery? It fuses the ECB's daily SovCISS sovereign-stress index with 10Y yield spreads over the Bund (OAT-Bund, BTP-Bund, Bonos-Bund). The 2011-12 crisis took BTP-Bund to ~550bp; France is now the locus that matters most — a core economy is harder to backstop than the periphery.