diff --git a/openfut-utas-host/src/lib.rs b/openfut-utas-host/src/lib.rs
index 2dbb317..7b1e705 100644
--- a/openfut-utas-host/src/lib.rs
+++ b/openfut-utas-host/src/lib.rs
@@ -2084,6 +2084,21 @@ impl Server {
         client_ip: Option<&str>,
     ) -> WireResponse {
         let path = target.split('?').next().unwrap_or(target);
+        // ─────────────────────── Economy authority barrier ───────────────────
+        // Every economy-touching route is owned by Rust/Core. Classified and
+        // dispatched HERE, before `classify()`, so a migrated route can NEVER also
+        // reach the Python passthrough (NEVER BOTH). When the economy services are
+        // wired (production `from_config`), an economy route ALWAYS returns `Some`
+        // — fail-closed (503) on any Core error — so there is no Python economy
+        // fallback. `None` means "not an economy route" (or no economy wired, i.e.
+        // a bare test server), which falls through to the classifier below.
+        if let Some(resp) = self.try_handle_economy(method, target, headers, body, client_ip) {
+            eprintln!(
+                "utas-host owner=RUST route=economy method={} path={} status={}",
+                method, path, resp.status
+            );
+            return resp;
+        }
         match classify(method, path) {
             Route::Club => {
                 let query = target.split_once('?').map(|(_, q)| q).unwrap_or("");
@@ -2128,11 +2143,31 @@ impl Server {
             }
             Route::UserMassInfo => {
                 let deps = self.squad_deps();
-                let (resp, log) =
+                let (mut resp, log) =
                     handle_user_mass_info(method, target, headers, body, &deps, self.pass.as_ref());
+                // Overlay the authoritative Core economy (coins + unopened-pack
+                // count) so NO stale Python economy value is visible post-barrier.
+                // userMassInfo remains a hybrid by design: Python supplies the
+                // non-economy envelope; Rust owns the squad AND the economy fields.
+                let mut econ_overlaid = false;
+                if let Some(svc) = &self.economy {
+                    if (200..300).contains(&resp.status) {
+                        if let (Ok(coins), Ok(ents)) = (svc.econ.balance(), svc.econ.entitlements())
+                        {
+                            if let Ok(mut root) = serde_json::from_slice::<Value>(&resp.body) {
+                                if overlay_massinfo_economy(&mut root, coins, ents.len()) {
+                                    if let Ok(nb) = serde_json::to_vec(&root) {
+                                        set_json_body(&mut resp, nb);
+                                        econ_overlaid = true;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
                 eprintln!(
-                    "utas-host owner=RUST_OVERLAY route=userMassInfo status={} squad_outcome={} detail=[{}]",
-                    resp.status, log.outcome, log.detail
+                    "utas-host owner=RUST_OVERLAY route=userMassInfo status={} squad_outcome={} econ_overlaid={} detail=[{}]",
+                    resp.status, log.outcome, econ_overlaid, log.detail
                 );
                 resp
             }